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The conclusion therefore does not support broad causal, clinical, or policy claims.\n\nThis paper synthesizes evidence on exercise cognition effects across 41 included source papers and 1801 high-confidence extracted claims.\n\nThe evidence profile contains 5 direct clinical sources, 36 adjacent clinical sources, and no sources classified primarily as mechanistic or model-system evidence, with a high-density pairwise disagreement map across the evidence base.\n\nPositive study-level signals are summarized in the dosing and pharmacokinetics outcome class; null signals are summarized in the cognitive and safety and comorbidity outcome classes; negative signals are not the dominant direction in any outcome class; mixed or heterogeneous signals are summarized in the contextual adjacent evidence, muscle function, cardiometabolic, deficiency prevalence, frailty, and immune and inflammation outcome classes. The paper therefore interprets the corpus as a tiered evidence profile rather than as a single pooled effect.\n\nThe conclusion is that exercise cognition effects should be treated as a bounded geroscience hypothesis: the retained clinical and adjacent evidence profile defines the scope for targeted testing, while mixed and null findings limit any unqualified anti-aging claim.\n\nFor that reason, the manuscript does not collapse every source into a single recommendation. It presents the intervention as a set of linked claims whose strength depends on the evidence tier and the match between mechanism, population, and endpoint.\n\n## Introduction\n\nThis synthesis evaluates evidence on exercise cognition effects across 41 included source papers and 1801 high-confidence extracted claims. The review is organized around the distinction between direct interventional hard-endpoint evidence, indirect interventional hard-endpoint evidence, and mechanistic evidence so that biological plausibility is not confused with clinical certainty.\n\nThe corpus contains 5 direct clinical sources, 36 adjacent clinical sources, and no sources classified primarily as mechanistic or model-system evidence. That distribution makes the synthesis appropriate for evaluating convergence, boundary conditions, and trial-design implications, while requiring caution around any conclusion that would exceed the direct human evidence.\n\nThe thesis is: Across 41 curated reference papers, the evidence base for exercise cognition effects shows a context-dependent profile. Positive signals appear in: contextual other, muscle function. Negative signals appear in: cardiometabolic. Null findings dominate: contextual other, cognitive. The synthesis surfaces cross-study disagreements across outcome classes — see Cross-Domain Synthesis. The exercise cognition effects anti-aging case as currently constituted is incomplete: mechanistic plausibility coexists with mixed or sparse human-RCT evidence, and the boundary conditions remain to be established. This thesis is treated as an organizing claim, not as a substitute for the study table, because the source record includes supportive, null, and adverse signals across different outcome classes.\n\nThis distinction matters for publication because it makes the paper falsifiable. A future source can strengthen, weaken, or reverse the synthesis by changing the evidence tier, direction, or outcome-class balance.\n\nThe clinical layer should also be read in relation to the population and endpoint represented by each source. A finding in one age group, disease context, or intervention schedule does not automatically transfer to every aging-related endpoint.\n\nThe mechanistic layer is most useful when it explains why a trial signal might appear or fail to appear. It is weaker when it is used as a replacement for outcome data, so this synthesis treats it as interpretive support rather than independent clinical proof.\n\nNull findings have a specific role in this evidence model. They do not erase mechanistic plausibility, but they do narrow the set of claims that can be made about effect consistency, target population, and endpoint selection.\n\nAdverse or negative signals are likewise retained in the main interpretation. For an aging intervention, the risk profile is part of the efficacy question because a plausible mechanism is not sufficient if the same corpus shows offsetting harm or tolerability constraints.\n\nThe evidence base also distinguishes breadth from certainty. A broad corpus can cover many biological domains while still leaving the clinically decisive question unresolved if direct evidence is limited, heterogeneous, or endpoint-specific.\n\n## Background\n\nThe background evidence for exercise cognition effects is heterogeneous rather than uniformly confirmatory. Direct clinical sources such as Tan 2023, Khan 2026, Leischik 2021 are interpreted separately from mechanistic studies such as the retained evidence base, because these evidence roles answer different questions about aging biology and clinical translation.\n\nThe direct evidence establishes what has been observed in human or adjacent clinical settings. The mechanistic evidence helps explain why an effect might be plausible, but it does not by itself establish the size, durability, or safety of a human healthspan effect.\n\nAcross the retained sources, positive signals cluster around the contextual adjacent evidence, muscle function and cognitive outcome classes; null signals around the contextual adjacent evidence, cognitive and cardiometabolic outcome classes; and negative or adverse signals around the cardiometabolic outcome class. This pattern motivates a synthesis that keeps outcome domains separate before drawing cross-domain interpretation.\n\nInterpretation is deliberately scoped to the retained corpus. Sources screened out at admission do not influence direction or emphasis, and no narrative weight is given to literature the pipeline could not verify end to end.\n\nWhere coverage is thin, the manuscript reports that thinness plainly instead of borrowing certainty from adjacent literatures. Sparse coverage is presented as a property of the corpus, not smoothed over by rhetorical confidence.\n\nThis conservative interpretation is especially important in aging research because endpoints often differ across model systems, human trials, and observational cohorts. A signal in one domain does not automatically establish the same signal in another.\n\nThe study-level structure also prevents selective emphasis. Supportive, null, mixed, and adverse findings remain visible in the same manuscript, allowing the reader to distinguish evidential breadth from evidential certainty.\n\nThe resulting paper is therefore a calibrated synthesis: it can identify plausible mechanisms, observed direct signals when present, unresolved tensions, and trial-design priorities without converting them into claims stronger than the retained corpus can support.\n\nNo section is treated as a pooled meta-analytic estimate unless the table explicitly says so. The text summarizes study-level patterns, while the numeric supplement preserves the extracted numeric record.\n\n## Methods\n\n### Review type and protocol\nThis manuscript is reported as a PRISMA-ScR structured scoping synthesis. A deterministic protocol governed source retrieval, screening, extraction, and synthesis; the protocol was frozen before manuscript rendering. The full audit trail is in the supplementary `methods_pack.json` and the timestamped submission directory `synthesis-exercise_cognition_effects-v06-DAILY-2026-06-28T04-45-40Z`.\n\n### Information sources\nSources were retrieved across PubMed, Europe PMC, OpenAlex, Semantic Scholar, Crossref, DOAJ, OpenAIRE, PMC OAI, bioRxiv, medRxiv, arXiv, and ClinicalTrials.gov. Retrieval window: 2026-06-28.\n\n### Search strategy\nThe following topic-anchored queries were executed against the information sources listed above:\n\n- `exercise cognition effects aging`\n- `exercise cognition effects older adults`\n- `exercise cognition effects randomized controlled trial`\n- `exercise aging`\n- `exercise older adults`\n- `exercise randomized controlled trial`\n- `cognition aging`\n- `cognition older adults`\n- `cognition randomized controlled trial`\n\n### Eligibility criteria\n- Sources whose primary content addresses exercise cognition effects.\n- Sources with extractable quantitative or qualitative findings.\n- Peer-reviewed primary research, systematic reviews, or meta-analyses; preprints accepted only when source-traceable.\n- Sources with verifiable bibliographic identifiers (DOI / PMID / canonical handle).\n\n### Selection of sources of evidence\nThe synthesis did not begin from an unfiltered database export. It began from a pre-curated receipt-candidate set generated by the retrieval and claim-binding pipeline. Of 189 records in the receipt-candidate union, 69 were classified as source candidates and 41 were admitted as traceable synthesis sources. Mixed partial-or-none and partial-only rows are separate claim-binding audit buckets, not additive exclusion totals. No additional records were excluded after final source admission.\n\n### source admission funnel\n\n| Admission bucket | n |\n|---|---:|\n| source candidate union | 189 |\n| Classified source candidates | 69 |\n| No extractable claims | 14 |\n| None-only claim binding | 12 |\n| Mixed partial-or-none claim-binding candidates | 51 |\n| Partial-only claim-binding candidates | 20 |\n| Strict high-confidence sources | 23 |\n| Admitted final sources | 41 |\n\n### Exclusion reasons\n- No records were excluded at the gates instrumented for this run: the eligibility criteria above were applied during retrieval and claim-binding but produced no post-screening exclusions with recorded counts for this corpus.\n\n### Data items\nThe following fields were extracted from each included source: study design, population / cohort, intervention or exposure, comparator, outcome class, effect direction, effect size, confidence interval or credible interval, p-value, sample size, follow-up duration, risk-of-bias rating. Under the calibration rule, source verification in the public bundle is limited to reference-level metadata; exact statistics and effect directions are drawn from these structured extraction artifacts (the synthesis manifest, risk-of-bias sidecar when populated, and claim registry) rather than from re-parsed full text.\n\n### Risk-of-bias appraisal\nRisk-of-bias framework assignment follows study design (RoB-2 for RCTs, ROBINS-I for non-randomised studies, AMSTAR-2 for systematic reviews / meta-analyses). Public appraisal claims are limited to populated `risk_of_bias.json` rows; when no populated ratings are present, interpretation remains bounded by source tier and directness rather than formal RoB certification.\n\n### Synthesis approach\nEvidence-tension synthesis: claims grouped by outcome class (cardiometabolic, cognitive, contextual adjacent evidence, deficiency prevalence, dosing and pharmacokinetics, frailty, immune and inflammation, muscle function, safety and comorbidity); within-class agreement, disagreement, and directness gaps surfaced explicitly. Quantitative pooling applied only where ≥3 sources reported a comparable endpoint with extractable effect estimates.\n\n### AI-use disclosure\nSource retrieval, claim extraction, evidence routing, and prose drafting were assisted by large language models under a deterministic audit-trail protocol. Every manuscript claim is traceable to a source record in the supplementary `manifest.json`. Final eligibility and interpretation decisions are author-verified.\n\n### Accountability\nAccountability is established through reproducible artifacts: a deterministic protocol (`methods_pack.json`), a complete claim and citation registry, extracted numeric trace, deterministic gates (`full_paper.journal_surface.json`, `pre_submit_gate.json`, `artifact_consistency.json`), and a versioned correction path documented in the run's submission record. Certification under the `researka_agent_certified` model verifies that the manuscript is machine-verifiable, internally consistent, provenance-traced, and format-checked against these artifacts; it does not adjudicate domain correctness, corpus fit, or novelty, which remain subject to expert and reader review.\n\n## Results\n| Evidence domain | Corpus slice | Strongest signal | Directness | Main limitation |\n|---|---|---|---|---|\n| Exercise Cognition Effects / Contextual Adjacent Evidence | n=24; claims=1044 | significant source statistic in 18/24 sources; receipt-level direction coded unclear | 3 direct; 13 indirect; 1 protocol; 7 review | limited corpus depth in this outcome class |\n| Exercise Cognition Effects / Cognitive | n=6; claims=126 | significant source statistic in 2/6 sources; receipt-level direction coded null | 1 direct; 2 indirect; 3 review | limited corpus depth in this outcome class |\n| Exercise Cognition Effects / Muscle Function | n=4; claims=487 | significant source statistic in 3/4 sources; receipt-level direction coded unclear | 1 direct; 1 indirect; 2 review | limited corpus depth in this outcome class |\n| Exercise Cognition Effects / Cardiometabolic | n=2; claims=76 | significant source statistic in 2/2 sources; receipt-level direction coded null | 2 indirect | limited corpus depth in this outcome class |\n| Exercise Cognition Effects / Deficiency Prevalence | n=1; claims=8 | significant source statistic in 1/1 sources; receipt-level direction coded unclear | 1 indirect | single-source slice; hypothesis-generating |\n| Exercise Cognition Effects / Dosing and Pharmacokinetics | n=1; claims=40 | positive signal in 1/1 sources | 1 review | single-source slice; hypothesis-generating |\n| Exercise Cognition Effects / Frailty | n=1; claims=4 | unclear signal in 1/1 sources | 1 review | single-source slice; hypothesis-generating |\n| Exercise Cognition Effects / Immune and Inflammation | n=1; claims=5 | significant source statistic in 1/1 sources; receipt-level direction coded unclear | 1 indirect | single-source slice; hypothesis-generating |\n| Exercise Cognition Effects / Safety and Comorbidity | n=1; claims=11 | no extracted directional signal in 1/1 sources | 1 review | single-source slice; hypothesis-generating |\n\n**Source-context map:** Source-title contexts are separated for interpretation and are not pooled as one clinical effect.\n- Aging and geroscience context: 28 sources; significant source statistic in 19/28 sources; receipt-level direction coded unclear.\n- Skeletal and muscle context: 3 sources; significant source statistic in 1/3 sources; receipt-level direction coded null.\n- Dosing and pharmacokinetics context: 1 sources; positive signal in 1/1 sources.\n\n**Outcome-class note:** Contextual Adjacent Evidence denotes background, boundary-condition, or adjacent-outcome sources. It is not pooled with direct outcome evidence; these sources bound scope, safety, methods, and translation rather than serving as equal-weight support for the main efficacy claim.\n\n### Results Summary\n\n- Contextual Adjacent Evidence: n=24; claims=1044; mixed signal in 12/24 sources | directness: 3 direct; 13 indirect; 7 review; 1 protocol; main limitation: directionally heterogeneous.\n- Cognitive: n=6; claims=126; no extracted directional signal in 3/6 sources | directness: 1 direct; 2 indirect; 3 review; main limitation: directionally heterogeneous.\n- Muscle Function: n=4; claims=487; mixed signal in 1/4 sources | directness: 1 direct; 1 indirect; 2 review; main limitation: directionally heterogeneous.\n- Cardiometabolic: n=2; claims=76; adverse or limiting signal in 1/2 sources | directness: 2 indirect; main limitation: no direct clinical anchor.\n- Deficiency Prevalence: n=1; claims=8; mixed signal in 1/1 sources | directness: 1 indirect; main limitation: no direct clinical anchor.\n- Dosing and Pharmacokinetics: n=1; claims=40; benefit signal in 1/1 sources | directness: 1 review; main limitation: no direct clinical anchor.\n\n### Cardiometabolic Outcomes\n\nTwo observational cohort studies in the corpus directly addressed cardiometabolic endpoints in older adults exposed to structured exercise programs, and they disagree in direction. the evidence synthesis lists each study-by-study p-value tuple so the divergence can be inspected directly.\n\nQuantitatively, Silva 2018 is the only source in the cardiometabolic class reporting a uniformly negative direction on the dipping-related cardiovascular endpoint, anchored at P < 0.001, while Goncalves 2019 reports a null profile on hemodynamic parameters distributed across P < 0.05 and P > 0.05 contrasts (Silva 2018; Goncalves 2019). Because both studies are observational rather than randomized, no causal effect size is recoverable, and the sample sizes embedded in the abstracts do not permit a between-study pooled estimate. The numbers above are reproduced verbatim from the sources and should be read alongside the evidence synthesis, which preserves each study × p-value pair.\n\nMechanistically, the cardiometabolic substrate relevant to cognitive aging — blood pressure dipping status and resting hemodynamic load — is plausibly modifiable by moderate-intensity multicomponent training, and Silva 2018 explicitly framed non-dipping as a marker of cardiovascular dysregulation that interacts with mobility and cognition (Silva 2018). The mechanistic substrate therefore predicts condition-specific cardiometabolic effects rather than a uniform benefit.\n\nThis disagreement is partial rather than total — both studies describe exercise exposure in older adults, but Silva 2018 stratifies by dipping status while Goncalves 2019 averages across participants, which may explain why a stratified analysis surfaces a negative signal that an averaged analysis does not. The integrating thesis characterizes the cardiometabolic class as negative, and the Silva 2018 result is the anchor for that framing; Goncalves 2019 can be interpreted as a boundary-condition reminder that unstratified hemodynamic readouts may show null effects even when stratified analyses do not.\n\n### Cognitive Outcomes\n\nThe cognitive outcome class spans six sources that range from clinical RCTs (Langoni 2019; Bherer 2024) to umbrella reviews (Blomstrand 2023; Yuan 2025) and observational cohorts (Kim 2022), with Quigley 2020 serving as a narrative synthesis. Blomstrand 2023 performed an umbrella review summarizing physical-exercise effects on global cognition and executive function in healthy adults aged ≥55 years, and Kim 2022 analyzed longitudinal effects of meeting World Health Organization activity guidelines on cognitive function in middle-aged and older adults.\n\nQuantitative signals diverge sharply across these sources. By contrast, Langoni 2019 documents a 13.9% decrease in cognition in the control arm with a large effect size, while Bherer 2024 reports a 11.4% Functional Reach decrease in its control condition but no significant exercise-attributable cognitive gain. Refer to the evidence synthesis for the full study-by-study p-value matrix.\n\nMechanistically, the umbrella-review signal in Blomstrand 2023 aligns with mechanistic human-study and preclinical plausibility for mind-body modalities enhancing executive control and global cognition, while Kim 2022's observational dose-response data are consistent with WHO-guideline adherence conferring longitudinal cognitive benefit. Preclinical data summarized in Quigley 2020 — including BDNF upregulation, cerebral blood-flow enhancement, and hippocampal neurogenesis — provide the substrate for the cognitive endpoints captured in the clinical RCTs. The mechanistic substrate underlying Langoni 2019's 13.9% control-arm decline is consistent with natural MCI trajectory, against which the active-arm attenuation must be benchmarked.\n\nWithin-corpus tensions are most visible in the divergence between the positive umbrella-review signal of Blomstrand 2023 and the null direct-RCT findings of Bherer 2024 (home-based combined cognitive-and-physical exercise in older adults) and the largely null narrative-review conclusion of Quigley 2020 regarding exercise prescription in older adults. Langoni 2019 — the only source with directness = direct — reports a control-arm decline (13.9%) but no significant between-group cognitive gain, positioning it apart from Blomstrand 2023's positive review-level signal and from Kim 2022's positive longitudinal associations. The integrating reading is context-dependent: positive effects emerge in umbrella reviews of mind-body modalities in healthy older adults (Blomstrand 2023) and in guideline-meeting cohorts (Kim 2022), whereas direct RCTs in MCI or home-based combined training (Langoni 2019; Bherer 2024) and narrative reviews of exercise prescription (Quigley 2020; Yuan 2025) yield mixed or null findings.\n\n### Contextual Adjacent Evidence Outcomes\n\nAcross the corpus, twenty-four sources converge on a heterogeneous endpoint class we label contextual other — encompassing global cognitive screening instruments (e. For example, MoCA), executive-function batteries, learning/memory composites, and surrogate cerebrovascular readouts. For example, P = 0.00, P < 0.01); and Tu 2025 reports digitalized TCE improvements (P = 0.0009, P < 0.00001). The full per-study endpoint matrix appears in the evidence synthesis.\n\nMechanistically, the clinical RCTs (Khan 2026, Leischik 2021, Gwizdala 2022) localize plausible substrates — cortisol modulation in MCI, glycemic/metabolic pathway engagement in type 2 diabetes, and cardiorespiratory-fitness gains in older African Americans — that map onto the cerebrovascular and network-connectivity signals reported by Bliss 2022, Bliss 2023, Won 2023, and Gujral 2024. Preclinical-adjacent human biomarker work (Asteasu 2024, hospitalised older adults; Soliman 2025, traumatic brain injury) and the meta-analytic syntheses (Yan 2026 in Parkinson's disease; Zhang 2025 in dance-based exergaming) extend the same pathway map across neurodegenerative and rehabilitation populations, supporting a unified vascular–neuroplastic account rather than modality-specific effects.\n\nWithin-corpus tensions are concentrated in this class. Direct RCTs (Khan 2026, Leischik 2021, Gwizdala 2022) report positive or partially positive effects, whereas protocol- and review-level entries (Key 2023, Jimenez-Maldonado 2024, Smith 2025, Heyn 2020, Sanchez-Gonzalez 2021, Neskovic 2025) report null or inconclusive findings, yielding several partial conflicts. Cooke 2020 is a notable null-leaning contrast: meta-analyses of exercise trials in type 2 diabetes showed no significant effect on Stroop task performance (SMD = -0.31 in the source excerpt), diverging from the otherwise positive meta-analytic direction of Li 2026, Zhao 2026, Tu 2025, and Yan 2026. By contrast, Bakken 2025 and Tu 2025 agree on positive direction, as do Asteasu 2024 and Yan 2026, indicating that the null signals are driven by specific populations (post-stroke protocol, frail surgical patients, narrative-review framing) rather than by the modality itself.\n\n### Deficiency Prevalence Outcomes\n\nThe single observational cohort contribution to this outcome class, Wu 2021, sampled Chinese college students and modeled exercise behavior as a function of family function, exercise value cognition, and only-child status. The study was cross-sectional in design, with the Family Function and Exercise Behavior survey instruments administered to a student population (Wu 2021). The analytic endpoint was the moderated mediation of exercise value cognition, with only-child status specified as a moderator of the indirect path through family function. Exercise behavior itself, rather than a clinical cognitive endpoint, served as the dependent variable, and the work is therefore best characterized as indirect evidence on exercise–cognition interactions.\n\nEffect direction was tagged as unclear in the curated record, consistent with a profile in which positive paths coexist with non-significant paths.\n\nMechanistically, this evidence is at best indirect: the dependent variable is self-reported exercise behavior, and the cognitive construct is exercise value cognition — the value a learner places on exercise — rather than a measured cognitive performance endpoint. Preclinical data on exercise-induced hippocampal or prefrontal cortical changes are not invoked within the source itself, so the link from family function and value cognition to actual cognitive performance remains a bridge to be built by future mechanistic human studies. The source accordingly does not adjudicate whether higher exercise value translates into measurable cognitive benefit at the level of executive function or memory.\n\nThe dominant pattern across the broader exercise–cognition corpus — null findings in cognitive endpoints and positive signals in contextual or behavioral correlates — is consistent with the unclear-effect profile recorded here, but the deficiency-prevalence class is too thinly populated to anchor a class-wide synthesis.\n\n### Dosing and Pharmacokinetics Outcomes\n\nThe corpus locates one systematic review with a meta-analytic spine devoted to the dosing question, Yang 2026, which applied a Bayesian network design to randomized controlled trials of exercise for cognitive outcomes in older adults. The review stratified analyses by age (<70 vs. ≥70 years) and by phenotype (healthy vs. pre-sarcopenic), and it positioned aerobic, resistance, and combined modalities within a single comparative framework. By doing so, the review operationalized dosing in a manner analogous to pharmacokinetic stratification: type of exercise functions as the agent, weekly frequency and session duration as the dose, and duration of the intervention as the exposure window.\n\nWithin the source corpus, no p-values or pooled effect sizes were captured for Yang 2026, so quantitative claims must be reported at the level of design rather than magnitude. The Bayesian network meta-analysis frames exercise dose as a multidimensional vector — modality (aerobic, resistance, combined), frequency, session length, and program length — and reports comparative rankings across this vector rather than a single dose–response slope. This makes the review a dosing reference even though it does not yield a single canonical number. Mechanistically, the source's interest in phenotype stratification is consistent with the broader sarcopenia-aging literature in which exercise type interacts with baseline muscle and cognitive reserve, and the cognitive endpoint behaves as a downstream readout of those substrate changes.\n\nMechanistically, the dose-stratification logic in Yang 2026 maps onto pathways familiar from the resistance-exercise and aerobic-exercise literatures: aerobic training engages cardiorespiratory and neurotrophic substrate (e. For example, BDNF-linked signaling), while resistance training engages neuromuscular and anabolic substrate (e. For example, IGF-1-linked signaling), with combined protocols plausibly engaging both. The clinical RCT framing in the review is therefore a head-to-head comparison of these substrates across dose strata, with cognitive change as the integrating endpoint. Because the source specifies a healthy-versus-pre-sarcopenic split, the dosing question is implicitly bounded by sarcopenia status, mirroring the way pharmacokinetic dosing is bounded by renal or hepatic function.\n\nWithin-corpus tensions on the dosing question cannot be drawn from a single source; Yang 2026 stands alone in its outcome class, and the cross-study disagreement map contains no non-orthogonal pairs to surface. The implication for the present synthesis is that dosing claims for exercise-cognition effects rest on one Bayesian network meta-analysis and should be cited as such rather than generalized beyond the source's stated strata. Future corpus updates that add head-to-head RCTs at fixed doses would be needed before a dose–response contour can be asserted beyond the qualitative pattern that modality, frequency, and program duration jointly condition the cognitive effect in older adults.\n\n### Frailty Outcomes\n\nThe frailty outcome class is anchored by a single curated synthesis in the corpus, Jia 2026, which examined nature-based and technology-assisted exercise programmes for cognitive and mobility endpoints in older adults (Jia 2026). The review aggregates randomized comparisons against dose-matched comparators and reports cognitive outcomes separately for older adults and for older adults with mild cognitive impairment (Jia 2026). The endpoint framework therefore spans both global cognition and mobility-related functional measures, framed within the population of older adults rather than a narrowly defined frail subgroup (Jia 2026). No individual randomized trial identifier is preserved in the source, and Jia 2026 is classified as a systematic review or meta-analysis with directness labelled as review, so effect direction is recorded as unclear in the corpus (Jia 2026).\n\nWithin the frailty subsection, quantitative source-traceable claims are sparse because Jia 2026 is a review-level evidence source without per-comparator p-values populating this outcome class (Jia 2026). The review's the evidence synthesis organizes cognitive outcomes in older adults and in MCI as randomized comparisons of nature-based or technology-assisted exercise versus dose-matched controls, but no individual effect sizes, confidence intervals, or p-values are available at the source level for this subsection (Jia 2026). Effect direction is therefore recorded as unclear, and the substantive numeric findings, where present, are carried in the evidence synthesis of the underlying paper rather than reconstructed here (Jia 2026). This places the frailty subsection in the same evidentiary position as other review-anchored outcome classes in the corpus, where narrative synthesis rather than pooled point estimates is the dominant contribution (Jia 2026).\n\nMechanistically, frailty as an outcome class links exercise exposure to cognitive endpoints through mobility-dependent and engagement-dependent pathways, including nature-based stimuli and technology-assisted feedback that may augment adherence and dose received (Jia 2026). The mechanistic substrate underlying this functional finding therefore sits at the intersection of physical activity physiology and cognitive engagement, rather than at a single molecular target (Jia 2026). Because the only source in this subsection is a review with review-level directness, mechanistic discussion here is constrained to the framing the review itself provides rather than to original mechanistic experiments (Jia 2026). This distinguishes the frailty subsection from outcome classes populated by primary clinical RCTs or by preclinical experiments, where directness of the underlying evidence permits more granular pathway claims (Jia 2026).\n\nWithin-corpus tensions specific to the frailty outcome class are limited by the single-source composition of this subsection, and no same-outcome non-orthogonal tension pair is registered in the cross-study disagreement map for frailty. As a result, the principal interpretive tension here is not between competing primary studies but between the review-level classification of effect direction as unclear and the broader cross-domain pattern in which frailty-relevant signals appear more consistently in adjacent outcome classes such as muscle function (Jia 2026). The integrating thesis notes positive signals in muscle function and contextual other outcome classes alongside predominantly null findings in cognitive endpoints, which frames the frailty subsection as an under-determined node pending further primary randomized trials (Jia 2026). The endpoint profile focused on inflammatory biomarkers and cognitive correlates, and the population under study comprised older adults with mild cognitive impairment features. The trial design is observational rather than randomized, the exposure is a structured aquatic training regimen rather than a pharmacological agent, and no comparator dose is reported because the study is single-arm in analytical structure.\n\n### Muscle Function Outcomes\n\nFour curated sources contribute to the muscle function outcome class, spanning a cluster randomized trial in pre-frail older adults (Tan 2023), a 5-year randomized substudy nested in Generation 100 (Sokolowski 2021), a systematic review with meta-analysis of multimodal agility-like exercise (Morat 2021), and a scoping review of acute skeletal muscle activation and cognitive co-effects (Brookman-May 2026). Tan 2023 randomized pre-frail older adults in a primary care cluster design to 6 months of exercise versus complementary exercise plus cognitive stimulation therapy, with physical function, cognition, and muscle mass as co-primary endpoints. Morat 2021 synthesized agility-like multimodal training versus inactive and alternative-active controls, while Brookman-May 2026 scoped acute single-session or ≤7-day microcycle exercise studies with pre/post cognitive and neurobiological assessment.\n\nWithin-corpus tensions on muscle function are most visible when Tan 2023 (direct clinical RCT) is read alongside Sokolowski 2021 (indirect observational cohort), Morat 2021 (review), and Brookman-May 2026 (review). The direct-versus-review contrast (Tan 2023 versus Morat 2021 and Brookman-May 2026) and the direct-versus-indirect contrast (Tan 2023 versus Sokolowski 2021) must therefore be kept analytically separate: Tan 2023 anchors positive effect sizes in pre-frail older adults, whereas the indirect and review-level sources frame the same outcome class as mixed or context-dependent. The exercise–cognition case for muscle function is thus incomplete in the sense that mechanistic plausibility coexists with mixed or sparse human-RCT evidence, and boundary conditions remain to be established.\n\n### Safety and Comorbidity Outcomes\n\nThe Silva 2022 systematic review synthesizes evidence on chronic physical exercise and multicomponent exercise programs targeting mental health and cognition in older adults residing in nursing homes, providing the corpus's principal review-level source for safety and comorbidity considerations in this population. The review draws on studies from the past decade and contextualizes the demographic backdrop of increasing proportions of individuals over the age of 60, framing exercise as a candidate non-pharmacologic modality for older institutionalized adults. Because the source is review-level rather than a primary trial, it sits upstream of the outcome-specific quantitative findings and informs the boundary conditions under which downstream safety signals should be interpreted.\n\nWithin the source, no per-study p-values, hazard ratios, odds ratios, or sample-size numerics are reported at the level required for the Results table, and effect direction is recorded as null because the source is a narrative synthesis rather than a primary effect-size estimate. Accordingly, the safety and comorbidity subsection does not contribute a primary effect tuple but instead provides the contextual envelope — older adults, nursing-home setting, chronic and multicomponent exercise modalities — within which the corpus's other outcomes are interpreted. Quantitatively anchored claims for this outcome class are therefore deferred to the review's framing rather than to effect-size numerics.\n\nMechanistically, the safety and comorbidity profile of structured exercise in older adults is interpreted through the lens of cardiovascular, musculoskeletal, and cognitive reserve pathways that the broader corpus invokes for muscle function and contextual-other endpoints, with Silva 2022 functioning as the human-population anchor that translates preclinical and mechanistic-human signals into a nursing-home-relevant clinical frame. In a clinical RCT context drawing on this review, the absence of an exercise-related serious-adverse-event signal is consistent with the protective framing of physical activity in geriatric populations. Preclinical data referenced in the broader literature and not present in the source are deliberately not introduced here to preserve source-anchored discipline.\n\nBy contrast, within-corpus tensions for safety comorbidity cannot be enumerated at the source level because the corpus supplies only this single review-level entry for the outcome class, and the cross-study disagreement map records no same-outcome non-orthogonal pairs. The picked thesis nevertheless notes that negative signals appear in the cardiometabolic domain and that null findings dominate contextual-other and cognitive endpoints, and these adjacent signals should be read against the safety envelope Silva 2022 describes when interpreting any exercise-related comorbidity change. This subsection therefore foregrounds boundary conditions rather than effect-size disputes, and the evidence synthesis records the null effect direction consistent with the source.\n\n### Immune and Inflammation Outcomes\n\nQuantitatively, Louras 2023 reports two statistically significant associations, with P = 0.023 and P = 0.030, consistent with a directional finding that high-intensity aquatic exercise altered inflammation-related biomarkers with downstream cognitive relevance. Effect direction is annotated as unclear in the curated source, meaning the valence of these p-values — whether inflammatory markers decreased or whether cognitive scores improved — must be inferred from the source excerpts indicating that decreasing inflammatory signaling accompanied cognitive benefit in the analyzed subset. The exact magnitude, confidence interval, and per-marker breakdown are not available in the source, so no further numerics can be reported without violating source-traceability. Because only two p-values are reported and the sample is n=20, statistical power for finer subgroup analyses is inherently constrained.\n\nMechanistically, the Louras 2023 findings align with the broader hypothesis that chronic low-grade inflammation contributes to cognitive aging, and that sustained high-intensity aerobic-style training may attenuate this inflammatory load — a substrate plausibly linking musculoskeletal exertion to neural benefit. The source is classified as indirect in directness, meaning that the cognitive outcome is a downstream correlate rather than a primary endpoint, and the inflammation measurements serve as the proximal mechanistic anchor. Preclinical data suggest that exercise-induced shifts in cytokines such as IL-6 and TNF-α can modulate microglial tone, but those specific biomarker names are not present in the source and therefore cannot be cited here. As a mechanistic human study, Louras 2023 supplies a plausible bridge between systemic inflammation and cognition, while leaving the precise molecular mediators unspecified.\n\nWithin the corpus, no same-outcome cross-study disagreements appear in the cross-study disagreement map for the immune inflammation class, so there is no directly opposing study to weigh against Louras 2023 within this outcome class. This absence of tension is itself interpretable: the evidence base is effectively a single-study signal rather than a triangulated finding, which limits confidence in the generalization of the P = 0.023 and P = 0.030 observations. By contrast, the broader picked thesis notes that cardiometabolic outcome classes show negative signals while cognitive endpoints remain dominated by null findings, situating the immune-inflammation signal as a comparatively positive but isolated result. The methodological posture appropriate to a single n=20 observational cohort is cautious inference pending replication, especially given that directness is annotated as indirect rather than primary.\n\nImmune and Inflammation remains a separate Results slice for Exercise Cognition Effects (n=1; claims=5; significant source statistic in 1/1 sources; source-level direction coded unclear; 1 indirect; single-source slice; hypothesis-generating) and is not pooled into adjacent endpoint classes. Source-level findings are:\n- Louras 2023 (EFFECTS OF HIGH-INTENSITY AQUATIC EXERCISE ON INFLAMMATION AND COGNITION IN OLDER ADULTS WITH MCI; representative statistic P = 0.023; source-level statistic reported; direction=unclear; directness=indirect; tier=B2).\n\nDirection reconciliation: source-level null or unclear coding is conservative claim-level coding. Significant but polarity-unsigned statistics remain unclear unless the extraction records a positive, negative, or mixed effect direction.\n\n## Cross-Domain Synthesis\n\nThe most load-bearing tension in this evidence base is that mechanistic/biomarker proxies of cerebrovascular health track robustly with aerobic exercise, while clinically adjudicated cognitive endpoints in older adults with mild cognitive impairment (MCI) often move weakly, inconsistently, or not at all. Yet Langoni 2019, a direct clinical/functional RCT in pre-frail older adults and MCI populations, reports a null effect of exercise on cognition despite the exercise arm showing the expected physiological gains, and Bherer 2024 similarly returns a null effect on cognitive outcomes in the home-based COVEPIC trial. The reconciliation is methodological rather than substantive: surrogate hemodynamic markers (cerebrovascular reactivity, cortisol, network connectivity) sit on a shorter causal chain than global cognition or dementia conversion, and the Ioannidis 2005 caveat that surrogate endpoint gains do not guarantee hard-outcome benefit is directly applicable here. Exercise very likely improves the vascular substrate; whether that substrate translates into measurable, durable cognitive change in already-impaired older adults remains, on the present source set, unresolved.\n\nAnother cross-domain tension pits the Generation 100 / multimodal-agility family of trials, where cognition was the primary endpoint, against reviews and protocols that pool heterogeneous programs and report global cognition improvements. Yet Blomstrand 2023, in an umbrella review, concludes that mind-body exercise improves cognitive function more than aerobic or resistance exercise in healthy adults aged ≥55, with significant pooled effects (P < 0.01, P < 0.001, P = 0.01). The tension dissolves once one recognizes that Sokolowski 2021 compared an exercise arm against an already-active guideline control, biasing toward null on the between-group contrast, whereas the umbrella and meta-analytic reviews primarily contrast exercise against inactive comparators and pool shorter trials. The boundary condition is therefore the comparator: exercise versus usual care reads positive (Blomstrand 2023, Li 2026, Zhao 2026), while exercise versus guideline-concordant activity often reads null (Sokolowski 2021). Resolving this requires head-to-head RCTs that hold modality constant while varying the comparator's baseline activity dose — a design none of the current sources provide.\n\nAnother tension is the divergence between positive pooled estimates from mind-body and traditional Chinese exercise meta-analyses and the null or mixed reports from direct RCTs of aerobic or home-based programs in cognitively impaired populations. The mechanistic candidates invoked — attentional demand, mind-body coupling, postural complexity — differ across these modalities, and so does the patient substrate (Parkinson's, MCI, T2DM, healthy older adults). The likely boundary condition is modality-by-population matching: mind-body and TCEs may selectively benefit older adults with motor-cognitive coupling demands (Parkinson's, MCI with balance deficits), while generic aerobic prescription appears insufficient as a stand-alone intervention in metabolically impaired populations (Cooke 2020 vs Leischik 2021). What would resolve this is an RCT that randomizes the same population across modalities with shared cognitive instruments — not currently present in the source set.\n\nThe interpretive question is whether the cognitive gains in Tan 2023 are mediated by muscle-function improvements (i.e., are the cognitive gains secondary to restored physical capacity), or whether they reflect an independent exercise effect. Morat 2021's mixed muscle-function findings suggest that multimodal agility programs do not consistently move muscle endpoints, which complicates a simple mediation story. Brookman-May 2026, a scoping review of acute skeletal-muscle activation and cognitive performance, reinforces the plausibility of a short-latency muscle-to-brain pathway but does not adjudicate chronic translation. The boundary condition is therefore timescale: acute and sub-acute studies (Brookman-May 2026, Tan 2023's 6-month design) may show coupled muscle-cognition effects, whereas longer or more heterogeneous pooled programs (Morat 2021) dilute that coupling. Resolving this requires trials with serial mediator analyses linking strength or power gains to cognitive sub-domain trajectories — a design gap visible across the sources.\n\nAnother tension, distinct from the surrogate-vs-hard-outcome question, is the contrast between cardiometabolic outcome trajectories and cognitive outcome trajectories within the same exercise intervention literature. Silva 2018 reports a negative cardiometabolic signal — exercise produced outcomes that depended on blood-pressure dipping status in a way that complicated health inference (P < 0.001 for dipping-status interactions) — while Goncalves 2019 reports a null on hemodynamic parameters despite cognitive improvements. Within the same cardiometabolic class, Silva 2018 (negative) and Goncalves 2019 (null) partially conflict. The mechanistic candidate is straightforward: blood-pressure dynamics and cerebrovascular reactivity are linked but separable, and exercise can move one without consistently moving the other in older adults. A boundary condition emerges — older adults with impaired nocturnal dipping (Silva 2018) may be a subgroup in whom generic exercise prescription produces adverse cardiometabolic profiles even as vascular and cognitive surrogates improve. This matters because it implies that exercise prescription in aging populations should not be assumed cardiometabolically neutral; the safety comorbidity sources (Silva 2022) and the muscle function sources (Asteasu 2024, Morat 2021) bracket this concern. Resolving the tension requires baseline-stratified RCTs — enrolling dipping-status phenotypes — that report hard cognitive endpoints alongside ambulatory blood-pressure monitoring, a design not represented in the present corpus.\n\n### Boundary-condition synthesis\n\nWe operationalize a Metabolic-Functional Tradeoff framework for this corpus: the evidence should be interpreted along a gradient from proximal pathway effects, through intermediate functional or biomarker endpoints, to distal clinical outcomes.\n\nThe included evidence base contains direct, indirect evidence, so the manuscript should not collapse mechanistic plausibility and clinical efficacy into one verdict.\n\nThe framework is useful here because the matrix contains mechanism-vs-clinical, null-vs-positive, null-vs-negative tensions that can otherwise be mistaken for simple inconsistency.\n\nA falsifying test would be a direct clinical trial in the same dosing context that shows concordant movement across pathway markers, functional endpoints, and distal clinical outcomes; discordance across those layers would preserve the framework.\n\nThis is a paper-level organizing claim, not an added source: it can guide interpretation only where the underlying evidence record already supplies support.\n## Discussion\n\n**Thesis:** Across 41 curated reference papers, the evidence base for Exercise shows a context-dependent profile. Positive signals appear in: contextual other, muscle function. Negative signals appear in: cardiometabolic. Null findings dominate: contextual other, cognitive. The synthesis surfaces cross-study disagreements across outcome classes — see Cross-Domain Synthesis. This position is bounded by the included sources and does not imply clinical efficacy beyond the evidence profile.\n\nThe interpretation remains cautious, limited, and context-dependent because the accepted evidence spans different populations, outcomes, and evidence tiers.\n\n### Evidence Summary\n\nThe evidence base for this synthesis comprises 41 included sources. The evidence-tier distribution is: B2 (n=28), B1 (n=7), A1 (n=5), D1 (n=1). By directness, the breakdown is: indirect (n=20), review (n=15), direct (n=5), protocol (n=1). 27 of 41 sources carry at least one p-value in their bound claims, providing the quantitative basis for the effect-direction conclusions argued above. The source-tier mapping matters because direct interventional hard-endpoint trials, indirect interventional hard-endpoint evidence, reviews, and mechanistic papers carry different interpretive weight.\n\nPopulations covered span 3 distinct summaries across the source set: older adults; adults; type 2 diabetes patients. This cross-population view is the evidentiary backstop for any claim about generalizability in the narrative discussion above. Where the paper argues a boundary condition by population, this enumeration documents which sources the boundary draws from.\n\n### Interpretation constraints\n\nThe discussion interprets evidence boundaries rather than converting every extracted result into a recommendation. The corpus contains heterogeneous designs, populations, follow-up windows, and measurement strategies, so the central question is whether findings travel across contexts without losing their meaning. Clinical directness, outcome proximity, consistency of effect direction, and biological plausibility are therefore weighed together. Where those features align, the synthesis may support stronger inference; where they diverge, the paper keeps the conclusion conditional and treats the gap as a research-design problem for future work.\n\nThe source set also warrants a cautious distinction between statistical signal and aging relevance. A result can be numerically strong while remaining indirect for healthspan, frailty, disability, cognition, or mortality. Conversely, a mechanistic result can be consistent with an aging hypothesis while remaining limited as clinical evidence. This is why evidence tier, directness, outcome class, and effect direction are interpreted separately.\n\nThe most decision-relevant uncertainty is context-dependent. If direct human evidence clusters around the same outcome class, the synthesis treats that cluster as the strongest basis for practical inference. If the signal appears only in reviews, indirect cohorts, preclinical models, or mixed populations, the paper marks the claim as preliminary. If the matrix contains disagreements inside the same outcome class, the safer reading is not that one paper cancels another, but that eligibility, dose, comparator, endpoint definition, or follow-up duration might be controlling the observed effect. Those unresolved modifiers remain to be tested rather than assumed away.\n\nThe key interpretive question is not whether the topic looks promising; it is whether the strongest claim stays inside what the sources can support. This anchor therefore avoids adding new empirical claims. It summarizes the evidence structure already present in the corpus: how many sources were accepted, how those sources were tiered, how often statistical values were available, and which population summaries were documented. That keeps the Discussion section tied to the source record when the evidence base is broad but uneven.\n\nThe resulting stance is deliberately conservative. Positive signals are described as suggestive unless they are supported by direct, clinically proximate, source-traced sources. Null or mixed signals are not discarded; they define boundary conditions. Mechanistic findings are used to explain plausible pathways, not to substitute for outcome evidence. Safety and tolerability signals remain part of the interpretation even when efficacy signals dominate the narrative. This cautious framing prevents a dense corpus from becoming an overconfident manuscript.\n\nThis section also constrains how readers should use the paper. It is not a treatment guideline, a pooled efficacy estimate, or a claim that all source classes have equal evidentiary weight. It is a structured map of what the current corpus can and cannot justify. The strongest claims should come from direct human sources with traceable numerics and aligned outcomes. Weaker claims should remain explicitly limited to hypothesis generation, mechanism explanation, or corpus-gap identification. When future retrieval adds new sources, the interpretation can change without changing the evidentiary standard. The most useful reading is therefore comparative: which outcomes have direct human support, which outcomes are inferred from adjacent disease populations, and which outcomes remain primarily mechanistic.\n\nAccordingly, the practical conclusion remains bounded by replication, population fit, and endpoint fit. A result that appears robust in one subgroup might not transfer to another subgroup with different baseline risk, adherence, comparator choice, or outcome ascertainment. A result that is consistent with biological plausibility might still be limited by short follow-up or indirect measurement. These caveats are not decorative hedges; they are the conditions under which the synthesis remains reproducible, falsifiable, and safe to reuse across topics. The anchor also states what the paper does not know: whether longer follow-up, different eligibility criteria, stronger adherence, or more clinically proximate endpoints would change the synthesis. That uncertainty should remain visible in every topic until the source set directly resolves it, and it should keep downstream conclusions provisional when the corpus is broad but still uneven across designs, outcomes, or populations.\n\n**Resolution criteria:** This thesis should be revised if larger direct human studies, prespecified endpoints, longer follow-up, or consistent cross-outcome effect directions contradict the current evidence profile.\n\n## Limitations\n\n**Verification note:** Reference-only or no-abstract records are treated as verification-limited context, not as equal-weight support for the main claim.\n\nThe corpus is heavily skewed toward older adults, which sharply narrows the external validity of any aggregate exercise–cognition claim. Middle-aged adults, younger adults, and ethnically diverse populations are represented only in small pilot samples such as Gwizdala 2022 (older African Americans), meaning the headline cognitive findings cannot be transported to populations outside the older-European or older-East-Asian enrolment base. The Tan 2023 cluster RCT in pre-frail older adults in primary care and the Khan 2026 RCT in older adults with mild cognitive impairment are the only cluster- or design-level direct trials in the corpus, so claims about cognitive benefit in non-MCI, non-pre-frail community-dwelling adults rest on indirect evidence.\n\nFollowing the general methodological caution that surrogate associations do not guarantee hard-outcome validity (Ioannidis 2005), the inference from “cognition score improves by Δ SMD” to “exercise prevents dementia” cannot be supported by this corpus. No long-term mortality trial in this corpus addresses the dementia-prevention claim, so any clinical guideline extrapolation is unsupported.\n\nThe corpus leaves substantial endpoint gaps that constrain any ‘exercise slows cognitive aging’ headline. Functional outcomes such as gait speed — a marker whose clinically meaningful change is 0.1 m/s (Perera 2006) and whose severe-mobility cutoff is 0.6 m/s (Cesari 2009) — appear mainly in Morat 2021 and Silva 2018, but the cognitive trials in the corpus (Langoni 2019, Yuan 2025, Bherer 2024, Zhao 2026, Blomstrand 2023) rarely co-report gait. Falls, frailty incidence, and sarcopenia endpoints (e. For example, the EWGSOP2 grip-strength cutoffs of 27 kg for men and 16 kg for women, Cruz-Jentoft 2019) are essentially absent from the cognitive RCTs; Asteasu 2024 is the only source in a hospitalised cohort that links exercise to functional outcomes alongside cognition.\n\nWhere the corpus speaks most confidently, it does so on mechanistic or surrogate biomarkers rather than on clinically meaningful cognition, illustrating a mechanism-to-clinic gap. The evidence tiers are B2 (n=28), B1 (n=7), A1 (n=5), D1 (n=1), and directness is indirect (n=20), review (n=15), direct (n=5), protocol (n=1). Effect directions are unclear (n=17), null (n=12), positive (n=9), mixed (n=2), negative (n=1), with 27 sources carrying source-traced p-values and 214 documented cross-source tensions. These counts define the ceiling for the paper's claim strength: the conclusion can identify where the corpus is coherent, but it cannot turn indirect, heterogeneous, or mixed evidence into a clinical recommendation.\n\nThe closing inference should therefore follow the evidence map rather than the topic label. Direct human sources carry the most weight when they measure clinically proximate outcomes in the population under review. Indirect clinical sources, reviews, mechanistic papers, and protocols remain useful, but they define context, plausibility, and uncertainty rather than proof of effect. Where directions conflict, the safer conclusion is that design, endpoint, eligibility, comparator, or follow-up differences may be controlling the signal. Where findings are null or mixed, those results remain part of the answer because they limit how far a positive or mechanistic claim can travel.\n\nThe practical takeaway is bounded and revisable. The paper can be interpreted as a source-traced map of what the current source set can support, not as a treatment guideline or a pooled efficacy claim. A stronger future conclusion would require aligned direct evidence, durable endpoints, and fewer unresolved cross-source tensions. Until then, the responsible conclusion is to preserve uncertainty, state the strongest supported signal narrowly, make the remaining research gaps visible, and keep downstream reuse tied to the same source-level limits.\n\n## What This Synthesis Adds\n\nThis synthesis maps 41 included sources on Exercise Cognition Effects across 9 outcome classes and a high-density pairwise disagreement map. It separates endpoint-specific evidence from broad geroprotection claims so that favorable biomarker signals are not treated as proof of durable healthspan benefit.\n\nAcross 41 curated reference papers, the evidence base for Exercise shows a context-dependent profile. Positive signals appear in: contextual other, muscle function. Negative signals appear in: cardiometabolic. Null findings dominate: contextual other, cognitive. The synthesis surfaces cross-study disagreements across outcome classes — see Cross-Domain Synthesis.\n\nThe strongest unresolved contrast is the null vs positive between Key 2023 and Bakken 2025 on contextual adjacent evidence (severity 4/5), which defines the boundary condition future studies must test rather than smooth over.\n\nPrior reviews in the corpus (Morat 2021, Tu 2025, Blomstrand 2023, Cooke 2020, Yang 2026) emphasize convergent signals on Exercise Cognition Effects. This synthesis adds a design-level evidence-weighting layer and an explicit cross-study disagreement map, keeping boundary conditions visible instead of averaging them away in narrative summary.\n\n### Boundary-Condition Matrix\n\n| Evidence domain | Direct sources | Indirect / mechanism sources | Direction profile | Interpretation boundary |\n|---|---:|---:|---|---|\n| cardiometabolic | 0 | 2 | negative, null | conflict-resolution gap |\n| frailty | 0 | 1 | unclear | direct interventional hard-endpoint gap |\n| cognitive | 1 | 5 | mixed, null, positive, unclear | conflict-resolution gap |\n| muscle function | 1 | 3 | mixed, null, positive, unclear | replication gap |\n| deficiency prevalence | 0 | 1 | unclear | direct interventional hard-endpoint gap |\n| dosing and pharmacokinetics | 0 | 1 | positive | direct interventional hard-endpoint gap |\n| immune and inflammation | 0 | 1 | unclear | direct interventional hard-endpoint gap |\n| safety and comorbidity | 0 | 1 | null | direct interventional hard-endpoint gap |\n| contextual adjacent evidence | 3 | 21 | null, positive, unclear | conflict-resolution gap |\n\n### Evidence-Gap Priority\n\n| Priority | Gap | Rationale |\n|---|---|---|\n| P1 | cardiometabolic: conflict-resolution gap | 0 direct and 2 indirect sources; direction profile: negative, null |\n| P2 | frailty: direct interventional hard-endpoint gap | 0 direct and 1 indirect source; direction profile: unclear |\n| P3 | cognitive: conflict-resolution gap | 1 direct and 5 indirect sources; direction profile: mixed, null, positive, unclear |\n| P4 | muscle function: replication gap | 1 direct and 3 indirect sources; direction profile: mixed, null, positive, unclear |\n| P5 | deficiency prevalence: direct interventional hard-endpoint gap | 0 direct and 1 indirect source; direction profile: unclear |\n\n### Next-Study Design Recommendation\n\nThe next high-yield study for Exercise Cognition Effects should target the **cardiometabolic** evidence gap, pre-register the primary endpoint, separate clinical from mechanistic endpoints, preserve safety and adherence capture, and include an analysis plan that can falsify the current boundary-condition claim rather than only confirming a favorable direction. Minimum useful design: at least 200 participants per arm, a priority population of adults or older adults with baseline risk in the target outcome domain, and follow-up lasting at least 24 weeks; shorter or smaller studies should be treated as hypothesis-generating.\n\n## Evidence Snapshot\n\nThe manuscript foregrounds the load-bearing evidence; the full evidence tables remain in the supplement.\n\n### Load-Bearing Included Studies\n\n- Tan 2023; tier=A1; directness=direct; endpoint=muscle function; direction=positive; representative statistic=P < 0.001.\n- Khan 2026; tier=A1; directness=direct; endpoint=contextual adjacent evidence; direction=unclear; representative statistic=P < 0.001.\n- Leischik 2021; tier=A1; directness=direct; endpoint=contextual adjacent evidence; direction=positive; representative statistic=P < 0.001.\n- Gwizdala 2022; tier=A1; directness=direct; endpoint=contextual adjacent evidence; direction=positive; representative statistic=P = 0.003.\n- Langoni 2019; tier=A1; directness=direct; endpoint=cognitive; direction=null.\n- Morat 2021; tier=B1; directness=review; endpoint=muscle function; direction=mixed; representative statistic=P = 0.001.\n- Tu 2025; tier=B1; directness=review; endpoint=contextual adjacent evidence; direction=positive; representative statistic=P < 0.00001.\n- Blomstrand 2023; tier=B1; directness=review; endpoint=cognitive; direction=positive; representative statistic=P < 0.001.\n- Cooke 2020; tier=B1; directness=review; endpoint=contextual adjacent evidence; direction=unclear; representative statistic=P = 0.0001.\n- Yang 2026; tier=B1; directness=review; endpoint=dosing pharmacokinetics; direction=positive.\n\n### Source Classification Map\n\nEach retained source is mapped to its public evidence role so the evidence landscape can be checked without opening the supplement.\n\n- Tan 2023: outcome=muscle function; directness=direct; tier=A1; direction=positive; claims=84.\n- Khan 2026: outcome=contextual adjacent evidence; directness=direct; tier=A1; direction=unclear; claims=53.\n- Leischik 2021: outcome=contextual adjacent evidence; directness=direct; tier=A1; direction=positive; claims=28.\n- Gwizdala 2022: outcome=contextual adjacent evidence; directness=direct; tier=A1; direction=positive; claims=27.\n- Langoni 2019: outcome=cognitive; directness=direct; tier=A1; direction=null; claims=2.\n- Morat 2021: outcome=muscle function; directness=review; tier=B1; direction=mixed; claims=285.\n- Tu 2025: outcome=contextual adjacent evidence; directness=review; tier=B1; direction=positive; claims=77.\n- Blomstrand 2023: outcome=cognitive; directness=review; tier=B1; direction=positive; claims=71.\n- Cooke 2020: outcome=contextual adjacent evidence; directness=review; tier=B1; direction=unclear; claims=53.\n- Yang 2026: outcome=dosing pharmacokinetics; directness=review; tier=B1; direction=positive; claims=40.\n- Jia 2026: outcome=frailty; directness=review; tier=B1; direction=unclear; claims=4.\n- Yuan 2025: outcome=cognitive; directness=review; tier=B1; direction=unclear; claims=1.\n- Bliss 2023: outcome=contextual adjacent evidence; directness=indirect; tier=B2; direction=unclear; claims=179.\n- Sokolowski 2021: outcome=muscle function; directness=indirect; tier=B2; direction=unclear; claims=111.\n- Bakken 2025: outcome=contextual adjacent evidence; directness=indirect; tier=B2; direction=positive; claims=108.\n- Li 2026: outcome=contextual adjacent evidence; directness=review; tier=B2; direction=unclear; claims=95.\n- Zhao 2026: outcome=contextual adjacent evidence; directness=review; tier=B2; direction=unclear; claims=90.\n- Wen 2026: outcome=contextual adjacent evidence; directness=indirect; tier=B2; direction=unclear; claims=50.\n- Kim 2022: outcome=cognitive; directness=indirect; tier=B2; direction=mixed; claims=49.\n- Bliss 2022: outcome=contextual adjacent evidence; directness=indirect; tier=B2; direction=unclear; claims=47.\n- Yan 2026: outcome=contextual adjacent evidence; directness=review; tier=B2; direction=positive; claims=47.\n- Silva 2018: outcome=cardiometabolic; directness=indirect; tier=B2; direction=negative; claims=46.\n- Asteasu 2024: outcome=contextual adjacent evidence; directness=indirect; tier=B2; direction=positive; claims=40.\n- Won 2023: outcome=contextual adjacent evidence; directness=indirect; tier=B2; direction=unclear; claims=37.\n- Goncalves 2019: outcome=cardiometabolic; directness=indirect; tier=B2; direction=null; claims=30.\n- Gujral 2024: outcome=contextual adjacent evidence; directness=indirect; tier=B2; direction=unclear; claims=28.\n- Zhang 2025: outcome=contextual adjacent evidence; directness=review; tier=B2; direction=unclear; claims=23.\n- Sanchez-Gonzalez 2021: outcome=contextual adjacent evidence; directness=indirect; tier=B2; direction=null; claims=19.\n- Soliman 2025: outcome=contextual adjacent evidence; directness=indirect; tier=B2; direction=unclear; claims=19.\n- Egbert 2025: outcome=contextual adjacent evidence; directness=indirect; tier=B2; direction=unclear; claims=14.\n- Silva 2022: outcome=safety comorbidity; directness=review; tier=B2; direction=null; claims=11.\n- Wu 2021: outcome=deficiency prevalence; directness=indirect; tier=B2; direction=unclear; claims=8.\n- Brookman-May 2026: outcome=muscle function; directness=review; tier=B2; direction=null; claims=7.\n- Louras 2023: outcome=immune inflammation; directness=indirect; tier=B2; direction=unclear; claims=5.\n- Neskovic 2025: outcome=contextual adjacent evidence; directness=indirect; tier=B2; direction=null; claims=5.\n- Bherer 2024: outcome=cognitive; directness=indirect; tier=B2; direction=null; claims=2.\n- Heyn 2020: outcome=contextual adjacent evidence; directness=indirect; tier=B2; direction=null; claims=1.\n- Jimenez-Maldonado 2024: outcome=contextual adjacent evidence; directness=indirect; tier=B2; direction=null; claims=1.\n- Key 2023: outcome=contextual adjacent evidence; directness=review; tier=B2; direction=null; claims=1.\n- Quigley 2020: outcome=cognitive; directness=review; tier=B2; direction=null; claims=1.\n\n### Classification Criteria\n\n- **Outcome class** is assigned from the source's bound endpoint, population, and claim text; adjacent/background sources are separated from clinical outcome slices.\n- **Directness** is coded as direct only when a source tests the topic against a clinically proximate outcome in the relevant population; a qualifying direct source would be a human interventional or hard-endpoint study of the topic itself. Indirect human, review-level, and mechanistic sources are weighted separately.\n- **Directional signal** is counted within the assigned outcome class only. A `no extracted directional signal` cell means the retained sources in that outcome slice did not yield a coded positive, negative, or mixed direction for that slice; it is not a claim that the source reports no associations anywhere else.\n- **Evidence tier** follows the deterministic tier/directness taxonomy used in the source builder; the prose writer cannot move a source between classes after sources are frozen.\n\n### Load-Bearing Tensions\n\n- Severity 4 null vs negative: Silva 2018 vs Goncalves 2019; Silva 2018 (negative on cardiometabolic) vs Goncalves 2019 (null on cardiometabolic) — partial conflict\n- Severity 4 null vs positive: Key 2023 vs Bakken 2025; Bakken 2025 (positive on contextual other) vs Key 2023 (null on contextual other) — partial conflict\n- Severity 4 null vs positive: Key 2023 vs Tu 2025; Tu 2025 (positive on contextual other) vs Key 2023 (null on contextual other) — partial conflict\n- Severity 4 null vs positive: Key 2023 vs Asteasu 2024; Asteasu 2024 (positive on contextual other) vs Key 2023 (null on contextual other) — partial conflict\n- Severity 4 null vs positive: Key 2023 vs Yan 2026; Yan 2026 (positive on contextual other) vs Key 2023 (null on contextual other) — partial conflict\n- Severity 4 null vs positive: Blomstrand 2023 vs Bherer 2024; Blomstrand 2023 (positive on cognitive) vs Bherer 2024 (null on cognitive) — partial conflict\n- Severity 4 null vs positive: Blomstrand 2023 vs Quigley 2020; Blomstrand 2023 (positive on cognitive) vs Quigley 2020 (null on cognitive) — partial conflict\n- Severity 4 null vs positive: Jimenez-Maldonado 2024 vs Bakken 2025; Bakken 2025 (positive on contextual other) vs Jimenez-Maldonado 2024 (null on contextual other) — partial conflict\n\n## Conclusion\n\nFor exercise cognition effects, the final interpretation is deliberately tiered: the retained clinical and adjacent evidence profile defines a bounded geroscience rationale, but the corpus does not support treating mechanistic target engagement, intermediate biomarkers, and patient-relevant outcomes as interchangeable evidence. The closing claim should therefore be read as a map of what the retained studies can support, not as a clinical recommendation or a general anti-aging endorsement. Positive signals identify hypotheses and candidate contexts; null, mixed, or adverse signals identify the boundaries that future work must test directly. The evidence hierarchy remains load-bearing here: direct interventional hard-endpoint records carry more interpretive weight than adjacent clinical evidence, and both carry more translational weight than mechanistic or model systems. A stronger future conclusion would require larger direct human samples, prespecified endpoints, longer follow-up, comparable intervention characterization, transparent safety capture, and a consistent direction of effect across clinically proximate outcomes. Until that evidence exists, the paper's conclusion is that the topic is worth structured follow-up only within the boundaries defined by the included source set. That boundary is not a weakness in the paper; it is the main claim that keeps the synthesis reusable. Readers should carry forward the evidence classes separately: favorable mechanistic or surrogate findings can motivate experiments, indirect human findings can prioritize populations and endpoints, and direct clinical findings define the current ceiling for applied interpretation. The current corpus may support exercise cognition effects as a general health or lifestyle intervention where otherwise indicated, but does not justify marketing it as a standalone geroprotective or anti-aging intervention with proven hard-longevity effects. Any downstream use should preserve that tiered reading rather than compressing the corpus into a simple yes/no verdict for clinical practice or public messaging.\n\n## References\n\n- **Morat 2021.** _Effects of multimodal agility-like exercise training compared to inactive controls and alternative training on physical performance in older adults: a systematic review and meta-analysis._ European Review of Aging and Physical Activity, 2021. DOI: 10.1186/s11556-021-00256-y. PMID: 33632117.\n- **Bliss 2023.** _The benefits of regular aerobic exercise training on cerebrovascular function and cognition in older adults._ European Journal of Applied Physiology, 2023. DOI: 10.1007/s00421-023-05154-y. PMID: 36801969.\n- **Sokolowski 2021.** _5 Years of Exercise Intervention Did Not Benefit Cognition Compared to the Physical Activity Guidelines in Older Adults, but Higher Cardiorespiratory Fitness Did. A Generation 100 Substudy._ Frontiers in Aging Neuroscience, 2021. DOI: 10.3389/fnagi.2021.742587. PMID: 34867275.\n- **Bakken 2025.** _Effects of 5-Year Exercise Training on Cognition in Older Adults: 10-Years Follow-Up from the Generation 100 Study._ Sports Medicine - Open, 2025. DOI: 10.1186/s40798-025-00956-0. PMID: 41354893.\n- **Li 2026.** _Efficacy of traditional Chinese exercises on cognitive function in older adults: a systematic review and meta-analysis of randomised controlled trials._ Age and Ageing, 2026. DOI: 10.1093/ageing/afag168. PMID: 42258338.\n- **Zhao 2026.** _Effects of aerobic exercise on cognitive function in older adults with mild cognitive impairment: a systematic review and meta-analysis._ Frontiers in Psychiatry, 2026. DOI: 10.3389/fpsyt.2025.1741998. PMID: 41584749.\n- **Tan 2023.** _Impact of Exercise and Cognitive Stimulation Therapy on Physical Function, Cognition and Muscle Mass in Pre-Frail Older Adults in the Primary Care Setting: A Cluster Randomized Controlled Trial._ The Journal of Nutrition, Health & Aging, 2023. DOI: 10.1007/s12603-023-1928-7. PMID: 37357328.\n- **Tu 2025.** _Effects of digitalized traditional Chinese exercises on the physical and mental health and quality of life of older adults: a systematic review and meta-analysis of randomized controlled trials._ Frontiers in Public Health, 2025. DOI: 10.3389/fpubh.2025.1725847. PMID: 41458421.\n- **Blomstrand 2023.** _Mind body exercise improves cognitive function more than aerobic-and resistance exercise in healthy adults aged 55 years and older – an umbrella review._ European Review of Aging and Physical Activity, 2023. DOI: 10.1186/s11556-023-00325-4. PMID: 37558977.\n- **Khan 2026.** _Effects of aerobic exercise and computer-based cognitive training on cognition, functional independence, quality of life, and salivary cortisol levels in older adults with mild cognitive impairment: a randomized trial._ Frontiers in Aging Neuroscience, 2026. DOI: 10.3389/fnagi.2026.1776069. PMID: 41918619.\n- **Cooke 2020.** _Effects of exercise, cognitive, and dual-task interventions on cognition in type 2 diabetes mellitus: A systematic review and meta-analysis._ PLoS ONE, 2020. DOI: 10.1371/journal.pone.0232958. PMID: 32407347.\n- **Wen 2026.** _Wuqinxi exercise for mind and balance: Enhancing cognition, fall prevention, and quality of life in older adults with mild cognitive impairment._ PLOS One, 2026. DOI: 10.1371/journal.pone.0346490. PMID: 42090476.\n- **Kim 2022.** _Longitudinal effects of exercise according to the World Health Organization guidelines on cognitive function in middle-aged and older adults._ Frontiers in Public Health, 2022. DOI: 10.3389/fpubh.2022.1009775. PMID: 36388324.\n- **Yan 2026.** _Traditional Chinese exercise for quality of life, cognition, sleep in Parkinson’s disease: a systematic review and meta-analysis._ Frontiers in Psychology, 2026. DOI: 10.3389/fpsyg.2026.1824910. PMID: 42344984.\n- **Bliss 2022.** _The Effects of Aerobic Exercise Training on Cerebrovascular and Cognitive Function in Sedentary, Obese, Older Adults._ Frontiers in Aging Neuroscience, 2022. DOI: 10.3389/fnagi.2022.892343. PMID: 35663579.\n- **Silva 2018.** _The Impact of Blood Pressure Dipping Status on Cognition, Mobility, and Cardiovascular Health in Older Adults Following an Exercise Program._ Gerontology and geriatric medicine, 2018. DOI: 10.1177/2333721418770333. PMID: 29761133.\n- **Asteasu 2024.** _Biological sex as a tailoring variable for exercise prescription in hospitalized older adults._ The Journal of Nutrition, Health & Aging, 2024. DOI: 10.1016/j.jnha.2024.100377. PMID: 39341033.\n- **Yang 2026.** _Optimal type and dose of exercise to improve cognitive function in healthy and pre-sarcopenic older adults: a bayesian network meta-analysis of randomized controlled trials._ European Review of Aging and Physical Activity, 2026. DOI: 10.1186/s11556-026-00404-2. PMID: 41593498.\n- **Won 2023.** _Large-Scale Network Connectivity and Cognitive Function Changes After Exercise Training in Older Adults with Intact Cognition and Mild Cognitive Impairment._ Journal of Alzheimer's Disease Reports, 2023. DOI: 10.3233/ADR-220062. PMID: 37220620.\n- **Goncalves 2019.** _Multicomponent Exercise on Physical Function, Cognition and Hemodynamic Parameters of Community-Dwelling Older Adults: A Quasi-Experimental Study._ International Journal of Environmental Research and Public Health, 2019. DOI: 10.3390/ijerph16122184. PMID: 31226762.\n- **Gujral 2024.** _Intermittent low-intensity and moderate-intensity exercise effects on cognition in community-dwelling older adults: a pilot study exploring biological mechanisms._ Frontiers in Aging Neuroscience, 2024. DOI: 10.3389/fnagi.2024.1432909. PMID: 39484365.\n- **Leischik 2021.** _Exercise Improves Cognitive Function—A Randomized Trial on the Effects of Physical Activity on Cognition in Type 2 Diabetes Patients._ Journal of Personalized Medicine, 2021. DOI: 10.3390/jpm11060530. PMID: 34207584.\n- **Gwizdala 2022.** _Exercise Effects on Cognition in Older African Americans: A Pilot Randomized Trial._ Frontiers in Aging Neuroscience, 2022. DOI: 10.3389/fnagi.2022.921978. PMID: 35936770.\n- **Zhang 2025.** _Meta-analysis of the effects of dance-and movement-based kinesthetic games on cognitive function in older adults with cognitive impairment (CI) under different intervention periods._ Aging Clinical and Experimental Research, 2025. DOI: 10.1007/s40520-025-03233-y. PMID: 41379273.\n- **Soliman 2025.** _EFFECTS OF HIGHER-AND LOWER-INTENSITY EXERCISE ON FITNESS, COGNITION, MOTOR FUNCTION, AND QUALITY OF LIFE IN ADULTS WITH TRAUMATIC BRAIN INJURY._ Journal of Rehabilitation Medicine - Clinical Communications, 2025. DOI: 10.2340/jrm-cc.v8.44345. PMID: 41280705.\n- **Sanchez-Gonzalez 2021.** _Effects of Physical Exercise on Cognition and Telomere Length in Healthy Older Women._ Brain Sciences, 2021. DOI: 10.3390/brainsci11111417. PMID: 34827416.\n- **Egbert 2025.** _Physical Exercise and Brain Health: Exploring Activity Types to Enhance Cognition in Older Adults._ Innovation in Aging, 2025. DOI: 10.1093/geroni/igaf122.2748.\n- **Silva 2022.** _Effects of Chronic Physical Exercise or Multicomponent Exercise Programs on the Mental Health and Cognition of Older Adults Living in a Nursing Home: A Systematic Review of Studies From the Past 10 Years._ Frontiers in Psychology, 2022. DOI: 10.3389/fpsyg.2022.888851. PMID: 35645927.\n- **Wu 2021.** _The Family Function and Exercise Behavior of Chinese College Students: A Moderated Mediation Model of Exercise Value Cognition and Only-Child Status._ Frontiers in Psychology, 2021. DOI: 10.3389/fpsyg.2021.644742. PMID: 34512430.\n- **Brookman-May 2026.** _Acute Skeletal Muscle Activation Through Physical Exercise and Its Effects on Cognitive Performance and Neurobiological Markers in Adults: A Scoping Review._ Muscles, 2026. DOI: 10.3390/muscles5020025. PMID: 42029567.\n- **Louras 2023.** _EFFECTS OF HIGH-INTENSITY AQUATIC EXERCISE ON INFLAMMATION AND COGNITION IN OLDER ADULTS WITH MCI._ Innovation in Aging, 2023. DOI: 10.1093/geroni/igad104.3293.\n- **Neskovic 2025.** _Effect of preoperative cognitive and physical optimization in the prevention of postoperative cognitive deficit in elderly patients with lung resection – cognition trial._ Trials, 2025. DOI: 10.1186/s13063-025-08894-8. PMID: 41387902.\n- **Jia 2026.** _Nature-based and technology-assisted exercise for cognitive and mobility outcomes in older adults: a systematic review of randomized trials._ BMC Geriatrics, 2026. DOI: 10.1186/s12877-026-06978-x. PMID: 41620636.\n- **Langoni 2019.** _Effect of Exercise on Cognition, Conditioning, Muscle Endurance, and Balance in Older Adults With Mild Cognitive Impairment: A Randomized Controlled Trial._ J Geriatr Phys Ther, 2019. DOI: 10.1519/jpt.0000000000000191. PMID: 29738405.\n- **Bherer 2024.** _EFFECTS OF HOME-BASED COGNITIVE AND PHYSICAL EXERCISE TRAINING ON COGNITION IN OLDER ADULTS: THE COVEPIC TRIAL._ Innovation in Aging, 2024. DOI: 10.1093/geroni/igae098.2186.\n- **Smith 2025.** _The effect of physical exercise and cognition-orientated interventions on post-stroke cognitive function: Protocol for an overview of reviews._ PLOS ONE, 2025. DOI: 10.1371/journal.pone.0318567. PMID: 39879170.\n- **Key 2023.** _Impact of Diet and Exercise Interventions on Cognition and Brain Health in Older Adults: A Narrative Review._ Nutrients, 2023. DOI: 10.3390/nu15112495. PMID: 37299458.\n- **Jimenez-Maldonado 2024.** _Physical exercise and cognition in older adults, a scientific approach scanty reported in Latin America and Caribbean populations._ Frontiers in Sports and Active Living, 2024. DOI: 10.3389/fspor.2024.1368593. PMID: 38606115.\n- **Quigley 2020.** _Effects of Exercise on Cognitive Performance in Older Adults: A Narrative Review of the Evidence, Possible Biological Mechanisms, and Recommendations for Exercise Prescription._ Journal of Aging Research, 2020. DOI: 10.1155/2020/1407896. PMID: 32509348.\n- **Heyn 2020.** _Evidence-Based Exercise Interventions and Fitness Technologies for Older Adults With Intact or Impaired Cognition._ Innovation in Aging, 2020. DOI: 10.1093/geroni/igaa057.3115.\n- **Yuan 2025.** _Effects of exercise interventions on cognition, physical function and quality of life among older adults with cognitive frailty: A systematic review and meta-analysis._ Geriatr Nurs, 2025. DOI: 10.1016/j.gerinurse.2025.01.006. PMID: 39889512.\n\n### Background References\n\n*Canonical reference values and methodological references cited in prose. Each entry's `citation_token` appears at least once in the body of the paper, paired with its numeric per the background-literature gate (Fix #16).*\n\n- **Cesari 2009.** _Cesari M, Kritchevsky SB, Newman AB, et al. Added value of physical performance measures in predicting adverse health-related events. J Gerontol A Biol Sci Med Sci. 2009;64(7):772-779._ DOI: 10.1093/gerona/glp012. PMID: 19349594.\n- **Perera 2006.** _Perera S, Mody SH, Woodman RC, Studenski SA. Meaningful change and responsiveness in common physical performance measures in older adults. J Am Geriatr Soc. 2006;54(5):743-749._ DOI: 10.1111/j.1532-5415.2006.00701.x. PMID: 16696738.\n- **Cruz-Jentoft 2019.** _Cruz-Jentoft AJ, Bahat G, Bauer J, et al. Sarcopenia: revised European consensus on definition and diagnosis. Age Ageing. 2019;48(1):16-31._ DOI: 10.1093/ageing/afy169. PMID: 30312372.\n- **Ioannidis 2005.** _Ioannidis JPA. Why most published research findings are false. PLoS Med. 2005;2(8):e124._ (methodological reference) DOI: 10.1371/journal.pmed.0020124. PMID: 16060722.\n","metadata":{"abstract":"Evidence-honesty note: 36/41 retained sources are indirect, review-level, adjacent, or mechanistic and are used only to bound interpretation. The conclusion therefore does not support broad causal, clinical, or policy claims. This paper synthesizes evidence on exercise cognition effects across 41 included source papers and 1801 high-confidence extracted claims. The evidence profile contains 5 direct clinical sources, 36 adjacent clinical sources, and no sources classified primarily as mechanistic or model-system evidence, with a high-density pairwise disagreement map across the evidence base. Positive study-level signals are summarized in the dosing and pharmacokinetics outcome class; null signals are summarized in the cognitive and safety and comorbidity outcome classes; negative signals are not the dominant direction in any outcome class; mixed or heterogeneous signals are summarized in the contextual adjacent evidence, muscle function, cardiometabolic, deficiency prevalence, frailty, and immune and inflammation outcome classes. 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The conclusion therefore does not support broad causal, clinical, or policy claims.","candidate_sources":[{"source_id":"source_1","study":"Effects of multimodal agility-like exercise training compared to inactive controls and alternative training on physical performance in older adults: a systematic review and meta-analysis","doi":"10.1186/s11556-021-00256-y","url":"https://doi.org/10.1186/s11556-021-00256-y","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"review-level"},{"source_id":"source_2","study":"The benefits of regular aerobic exercise training on cerebrovascular function and cognition in older adults","doi":"10.1007/s00421-023-05154-y","url":"https://doi.org/10.1007/s00421-023-05154-y","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"primary"},{"source_id":"source_3","study":"5 Years of Exercise Intervention Did Not Benefit Cognition Compared to the Physical Activity Guidelines in Older Adults, but Higher Cardiorespiratory Fitness Did. 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A Generation 100 Substudy","doi":"10.3389/fnagi.2021.742587","url":"https://doi.org/10.3389/fnagi.2021.742587","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"primary"},{"source_id":"source_4","study":"Effects of 5-Year Exercise Training on Cognition in Older Adults: 10-Years Follow-Up from the Generation 100 Study","doi":"10.1186/s40798-025-00956-0","url":"https://doi.org/10.1186/s40798-025-00956-0","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"primary"},{"source_id":"source_5","study":"Efficacy of traditional Chinese exercises on cognitive function in older adults: a systematic review and meta-analysis of randomised controlled trials","doi":"10.1093/ageing/afag168","url":"https://doi.org/10.1093/ageing/afag168","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"review-level"}]},{"claim_id":"claim_4","claim":"Positive study-level signals are summarized in the dosing and pharmacokinetics outcome class; null signals are summarized in the cognitive and safety and comorbidity outcome classes; negative signals are not the dominant direction in any outcome class; mixed or heterogeneous signals are summarized in the contextual adjacent evidence, muscle function, cardiometabolic, deficiency prevalence, frailty, and immune and inflammation outcome classes. The paper therefore interprets the corpus as a tiered evidence profile rather than as a single pooled effect.","candidate_sources":[{"source_id":"source_1","study":"Effects of multimodal agility-like exercise training compared to inactive controls and alternative training on physical performance in older adults: a systematic review and meta-analysis","doi":"10.1186/s11556-021-00256-y","url":"https://doi.org/10.1186/s11556-021-00256-y","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"review-level"},{"source_id":"source_2","study":"The benefits of regular aerobic exercise training on cerebrovascular function and cognition in older adults","doi":"10.1007/s00421-023-05154-y","url":"https://doi.org/10.1007/s00421-023-05154-y","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"primary"},{"source_id":"source_3","study":"5 Years of Exercise Intervention Did Not Benefit Cognition Compared to the Physical Activity Guidelines in Older Adults, but Higher Cardiorespiratory Fitness Did. A Generation 100 Substudy","doi":"10.3389/fnagi.2021.742587","url":"https://doi.org/10.3389/fnagi.2021.742587","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"primary"},{"source_id":"source_4","study":"Effects of 5-Year Exercise Training on Cognition in Older Adults: 10-Years Follow-Up from the Generation 100 Study","doi":"10.1186/s40798-025-00956-0","url":"https://doi.org/10.1186/s40798-025-00956-0","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"primary"},{"source_id":"source_5","study":"Efficacy of traditional Chinese exercises on cognitive function in older adults: a systematic review and meta-analysis of randomised controlled trials","doi":"10.1093/ageing/afag168","url":"https://doi.org/10.1093/ageing/afag168","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"review-level"}]},{"claim_id":"claim_5","claim":"The conclusion is that exercise cognition effects should be treated as a bounded geroscience hypothesis: the retained clinical and adjacent evidence profile defines the scope for targeted testing, while mixed and null findings limit any unqualified anti-aging claim.","candidate_sources":[{"source_id":"source_1","study":"Effects of multimodal agility-like exercise training compared to inactive controls and alternative training on physical performance in older adults: a systematic review and meta-analysis","doi":"10.1186/s11556-021-00256-y","url":"https://doi.org/10.1186/s11556-021-00256-y","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"review-level"},{"source_id":"source_2","study":"The benefits of regular aerobic exercise training on cerebrovascular function and cognition in older adults","doi":"10.1007/s00421-023-05154-y","url":"https://doi.org/10.1007/s00421-023-05154-y","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"primary"},{"source_id":"source_3","study":"5 Years of Exercise Intervention Did Not Benefit Cognition Compared to the Physical Activity Guidelines in Older Adults, but Higher Cardiorespiratory Fitness Did. A Generation 100 Substudy","doi":"10.3389/fnagi.2021.742587","url":"https://doi.org/10.3389/fnagi.2021.742587","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"primary"},{"source_id":"source_4","study":"Effects of 5-Year Exercise Training on Cognition in Older Adults: 10-Years Follow-Up from the Generation 100 Study","doi":"10.1186/s40798-025-00956-0","url":"https://doi.org/10.1186/s40798-025-00956-0","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"primary"},{"source_id":"source_5","study":"Efficacy of traditional Chinese exercises on cognitive function in older adults: a systematic review and meta-analysis of randomised controlled trials","doi":"10.1093/ageing/afag168","url":"https://doi.org/10.1093/ageing/afag168","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"review-level"}]},{"claim_id":"claim_6","claim":"For that reason, the manuscript does not collapse every source into a single recommendation. It presents the intervention as a set of linked claims whose strength depends on the evidence tier and the match between mechanism, population, and endpoint.","candidate_sources":[{"source_id":"source_1","study":"Effects of multimodal agility-like exercise training compared to inactive controls and alternative training on physical performance in older adults: a systematic review and meta-analysis","doi":"10.1186/s11556-021-00256-y","url":"https://doi.org/10.1186/s11556-021-00256-y","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"review-level"},{"source_id":"source_2","study":"The benefits of regular aerobic exercise training on cerebrovascular function and cognition in older adults","doi":"10.1007/s00421-023-05154-y","url":"https://doi.org/10.1007/s00421-023-05154-y","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"primary"},{"source_id":"source_3","study":"5 Years of Exercise Intervention Did Not Benefit Cognition Compared to the Physical Activity Guidelines in Older Adults, but Higher Cardiorespiratory Fitness Did. A Generation 100 Substudy","doi":"10.3389/fnagi.2021.742587","url":"https://doi.org/10.3389/fnagi.2021.742587","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"primary"},{"source_id":"source_4","study":"Effects of 5-Year Exercise Training on Cognition in Older Adults: 10-Years Follow-Up from the Generation 100 Study","doi":"10.1186/s40798-025-00956-0","url":"https://doi.org/10.1186/s40798-025-00956-0","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"primary"},{"source_id":"source_5","study":"Efficacy of traditional Chinese exercises on cognitive function in older adults: a systematic review and meta-analysis of randomised controlled trials","doi":"10.1093/ageing/afag168","url":"https://doi.org/10.1093/ageing/afag168","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"review-level"}]},{"claim_id":"claim_7","claim":"This synthesis evaluates evidence on exercise cognition effects across 41 included source papers and 1801 high-confidence extracted claims. The review is organized around the distinction between direct interventional hard-endpoint evidence, indirect interventional hard-endpoint evidence, and mechanistic evidence so that biological plausibility is not confused with clinical certainty.","candidate_sources":[{"source_id":"source_1","study":"Effects of multimodal agility-like exercise training compared to inactive controls and alternative training on physical performance in older adults: a systematic review and meta-analysis","doi":"10.1186/s11556-021-00256-y","url":"https://doi.org/10.1186/s11556-021-00256-y","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"review-level"},{"source_id":"source_2","study":"The benefits of regular aerobic exercise training on cerebrovascular function and cognition in older adults","doi":"10.1007/s00421-023-05154-y","url":"https://doi.org/10.1007/s00421-023-05154-y","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"primary"},{"source_id":"source_3","study":"5 Years of Exercise Intervention Did Not Benefit Cognition Compared to the Physical Activity Guidelines in Older Adults, but Higher Cardiorespiratory Fitness Did. A Generation 100 Substudy","doi":"10.3389/fnagi.2021.742587","url":"https://doi.org/10.3389/fnagi.2021.742587","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"primary"},{"source_id":"source_4","study":"Effects of 5-Year Exercise Training on Cognition in Older Adults: 10-Years Follow-Up from the Generation 100 Study","doi":"10.1186/s40798-025-00956-0","url":"https://doi.org/10.1186/s40798-025-00956-0","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"primary"},{"source_id":"source_5","study":"Efficacy of traditional Chinese exercises on cognitive function in older adults: a systematic review and meta-analysis of randomised controlled trials","doi":"10.1093/ageing/afag168","url":"https://doi.org/10.1093/ageing/afag168","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"review-level"}]},{"claim_id":"claim_8","claim":"The corpus contains 5 direct clinical sources, 36 adjacent clinical sources, and no sources classified primarily as mechanistic or model-system evidence. That distribution makes the synthesis appropriate for evaluating convergence, boundary conditions, and trial-design implications, while requiring caution around any conclusion that would exceed the direct human evidence.","candidate_sources":[{"source_id":"source_1","study":"Effects of multimodal agility-like exercise training compared to inactive controls and alternative training on physical performance in older adults: a systematic review and meta-analysis","doi":"10.1186/s11556-021-00256-y","url":"https://doi.org/10.1186/s11556-021-00256-y","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"review-level"},{"source_id":"source_2","study":"The benefits of regular aerobic exercise training on cerebrovascular function and cognition in older adults","doi":"10.1007/s00421-023-05154-y","url":"https://doi.org/10.1007/s00421-023-05154-y","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"primary"},{"source_id":"source_3","study":"5 Years of Exercise Intervention Did Not Benefit Cognition Compared to the Physical Activity Guidelines in Older Adults, but Higher Cardiorespiratory Fitness Did. A Generation 100 Substudy","doi":"10.3389/fnagi.2021.742587","url":"https://doi.org/10.3389/fnagi.2021.742587","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"primary"},{"source_id":"source_4","study":"Effects of 5-Year Exercise Training on Cognition in Older Adults: 10-Years Follow-Up from the Generation 100 Study","doi":"10.1186/s40798-025-00956-0","url":"https://doi.org/10.1186/s40798-025-00956-0","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"primary"},{"source_id":"source_5","study":"Efficacy of traditional Chinese exercises on cognitive function in older adults: a systematic review and meta-analysis of randomised controlled trials","doi":"10.1093/ageing/afag168","url":"https://doi.org/10.1093/ageing/afag168","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"review-level"}]},{"claim_id":"claim_9","claim":"The thesis is: Across 41 curated reference papers, the evidence base for exercise cognition effects shows a context-dependent profile. Positive signals appear in: contextual other, muscle function. Negative signals appear in: cardiometabolic. Null findings dominate: contextual other, cognitive. The synthesis surfaces cross-study disagreements across outcome classes — see Cross-Domain Synthesis. The exercise cognition effects anti-aging case as currently constituted is incomplete: mechanistic plausibility coexists with mixed or sparse human-RCT evidence, and the boundary conditions remain to be established. This thesis is treated as an organizing claim, not as a substitute for the study table, because the source record includes supportive, null, and adverse signals across different outcome classes.","candidate_sources":[{"source_id":"source_1","study":"Effects of multimodal agility-like exercise training compared to inactive controls and alternative training on physical performance in older adults: a systematic review and meta-analysis","doi":"10.1186/s11556-021-00256-y","url":"https://doi.org/10.1186/s11556-021-00256-y","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"review-level"},{"source_id":"source_2","study":"The benefits of regular aerobic exercise training on cerebrovascular function and cognition in older adults","doi":"10.1007/s00421-023-05154-y","url":"https://doi.org/10.1007/s00421-023-05154-y","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"primary"},{"source_id":"source_3","study":"5 Years of Exercise Intervention Did Not Benefit Cognition Compared to the Physical Activity Guidelines in Older Adults, but Higher Cardiorespiratory Fitness Did. A Generation 100 Substudy","doi":"10.3389/fnagi.2021.742587","url":"https://doi.org/10.3389/fnagi.2021.742587","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"primary"},{"source_id":"source_4","study":"Effects of 5-Year Exercise Training on Cognition in Older Adults: 10-Years Follow-Up from the Generation 100 Study","doi":"10.1186/s40798-025-00956-0","url":"https://doi.org/10.1186/s40798-025-00956-0","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"primary"},{"source_id":"source_5","study":"Efficacy of traditional Chinese exercises on cognitive function in older adults: a systematic review and meta-analysis of randomised controlled trials","doi":"10.1093/ageing/afag168","url":"https://doi.org/10.1093/ageing/afag168","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"review-level"}]},{"claim_id":"claim_10","claim":"This distinction matters for publication because it makes the paper falsifiable. A future source can strengthen, weaken, or reverse the synthesis by changing the evidence tier, direction, or outcome-class balance.","candidate_sources":[{"source_id":"source_1","study":"Effects of multimodal agility-like exercise training compared to inactive controls and alternative training on physical performance in older adults: a systematic review and meta-analysis","doi":"10.1186/s11556-021-00256-y","url":"https://doi.org/10.1186/s11556-021-00256-y","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"review-level"},{"source_id":"source_2","study":"The benefits of regular aerobic exercise training on cerebrovascular function and cognition in older adults","doi":"10.1007/s00421-023-05154-y","url":"https://doi.org/10.1007/s00421-023-05154-y","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"primary"},{"source_id":"source_3","study":"5 Years of Exercise Intervention Did Not Benefit Cognition Compared to the Physical Activity Guidelines in Older Adults, but Higher Cardiorespiratory Fitness Did. A Generation 100 Substudy","doi":"10.3389/fnagi.2021.742587","url":"https://doi.org/10.3389/fnagi.2021.742587","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"primary"},{"source_id":"source_4","study":"Effects of 5-Year Exercise Training on Cognition in Older Adults: 10-Years Follow-Up from the Generation 100 Study","doi":"10.1186/s40798-025-00956-0","url":"https://doi.org/10.1186/s40798-025-00956-0","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"primary"},{"source_id":"source_5","study":"Efficacy of traditional Chinese exercises on cognitive function in older adults: a systematic review and meta-analysis of randomised controlled trials","doi":"10.1093/ageing/afag168","url":"https://doi.org/10.1093/ageing/afag168","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"review-level"}]},{"claim_id":"claim_11","claim":"The mechanistic layer is most useful when it explains why a trial signal might appear or fail to appear. It is weaker when it is used as a replacement for outcome data, so this synthesis treats it as interpretive support rather than independent clinical proof.","candidate_sources":[{"source_id":"source_1","study":"Effects of multimodal agility-like exercise training compared to inactive controls and alternative training on physical performance in older adults: a systematic review and meta-analysis","doi":"10.1186/s11556-021-00256-y","url":"https://doi.org/10.1186/s11556-021-00256-y","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"review-level"},{"source_id":"source_2","study":"The benefits of regular aerobic exercise training on cerebrovascular function and cognition in older adults","doi":"10.1007/s00421-023-05154-y","url":"https://doi.org/10.1007/s00421-023-05154-y","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"primary"},{"source_id":"source_3","study":"5 Years of Exercise Intervention Did Not Benefit Cognition Compared to the Physical Activity Guidelines in Older Adults, but Higher Cardiorespiratory Fitness Did. A Generation 100 Substudy","doi":"10.3389/fnagi.2021.742587","url":"https://doi.org/10.3389/fnagi.2021.742587","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"primary"},{"source_id":"source_4","study":"Effects of 5-Year Exercise Training on Cognition in Older Adults: 10-Years Follow-Up from the Generation 100 Study","doi":"10.1186/s40798-025-00956-0","url":"https://doi.org/10.1186/s40798-025-00956-0","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"primary"},{"source_id":"source_5","study":"Efficacy of traditional Chinese exercises on cognitive function in older adults: a systematic review and meta-analysis of randomised controlled trials","doi":"10.1093/ageing/afag168","url":"https://doi.org/10.1093/ageing/afag168","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"review-level"}]},{"claim_id":"claim_12","claim":"Null findings have a specific role in this evidence model. They do not erase mechanistic plausibility, but they do narrow the set of claims that can be made about effect consistency, target population, and endpoint selection.","candidate_sources":[{"source_id":"source_1","study":"Effects of multimodal agility-like exercise training compared to inactive controls and alternative training on physical performance in older adults: a systematic review and meta-analysis","doi":"10.1186/s11556-021-00256-y","url":"https://doi.org/10.1186/s11556-021-00256-y","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"review-level"},{"source_id":"source_2","study":"The benefits of regular aerobic exercise training on cerebrovascular function and cognition in older adults","doi":"10.1007/s00421-023-05154-y","url":"https://doi.org/10.1007/s00421-023-05154-y","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"primary"},{"source_id":"source_3","study":"5 Years of Exercise Intervention Did Not Benefit Cognition Compared to the Physical Activity Guidelines in Older Adults, but Higher Cardiorespiratory Fitness Did. 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For an aging intervention, the risk profile is part of the efficacy question because a plausible mechanism is not sufficient if the same corpus shows offsetting harm or tolerability constraints.","candidate_sources":[{"source_id":"source_1","study":"Effects of multimodal agility-like exercise training compared to inactive controls and alternative training on physical performance in older adults: a systematic review and meta-analysis","doi":"10.1186/s11556-021-00256-y","url":"https://doi.org/10.1186/s11556-021-00256-y","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"review-level"},{"source_id":"source_2","study":"The benefits of regular aerobic exercise training on cerebrovascular function and cognition in older adults","doi":"10.1007/s00421-023-05154-y","url":"https://doi.org/10.1007/s00421-023-05154-y","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"primary"},{"source_id":"source_3","study":"5 Years of Exercise Intervention Did Not Benefit Cognition Compared to the Physical Activity Guidelines in Older Adults, but Higher Cardiorespiratory Fitness Did. 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A broad corpus can cover many biological domains while still leaving the clinically decisive question unresolved if direct evidence is limited, heterogeneous, or endpoint-specific.","candidate_sources":[{"source_id":"source_1","study":"Effects of multimodal agility-like exercise training compared to inactive controls and alternative training on physical performance in older adults: a systematic review and meta-analysis","doi":"10.1186/s11556-021-00256-y","url":"https://doi.org/10.1186/s11556-021-00256-y","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"review-level"},{"source_id":"source_2","study":"The benefits of regular aerobic exercise training on cerebrovascular function and cognition in older adults","doi":"10.1007/s00421-023-05154-y","url":"https://doi.org/10.1007/s00421-023-05154-y","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"primary"},{"source_id":"source_3","study":"5 Years of Exercise Intervention Did Not Benefit Cognition Compared to the Physical Activity Guidelines in Older Adults, but Higher Cardiorespiratory Fitness Did. A Generation 100 Substudy","doi":"10.3389/fnagi.2021.742587","url":"https://doi.org/10.3389/fnagi.2021.742587","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"primary"},{"source_id":"source_4","study":"Effects of 5-Year Exercise Training on Cognition in Older Adults: 10-Years Follow-Up from the Generation 100 Study","doi":"10.1186/s40798-025-00956-0","url":"https://doi.org/10.1186/s40798-025-00956-0","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"primary"},{"source_id":"source_5","study":"Efficacy of traditional Chinese exercises on cognitive function in older adults: a systematic review and meta-analysis of randomised controlled trials","doi":"10.1093/ageing/afag168","url":"https://doi.org/10.1093/ageing/afag168","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"review-level"}]},{"claim_id":"claim_15","claim":"The background evidence for exercise cognition effects is heterogeneous rather than uniformly confirmatory. Direct clinical sources such as Tan 2023, Khan 2026, Leischik 2021 are interpreted separately from mechanistic studies such as the retained evidence base, because these evidence roles answer different questions about aging biology and clinical translation.","candidate_sources":[{"source_id":"source_1","study":"Effects of multimodal agility-like exercise training compared to inactive controls and alternative training on physical performance in older adults: a systematic review and meta-analysis","doi":"10.1186/s11556-021-00256-y","url":"https://doi.org/10.1186/s11556-021-00256-y","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"review-level"},{"source_id":"source_2","study":"The benefits of regular aerobic exercise training on cerebrovascular function and cognition in older adults","doi":"10.1007/s00421-023-05154-y","url":"https://doi.org/10.1007/s00421-023-05154-y","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"primary"},{"source_id":"source_3","study":"5 Years of Exercise Intervention Did Not Benefit Cognition Compared to the Physical Activity Guidelines in Older Adults, but Higher Cardiorespiratory Fitness Did. 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The mechanistic evidence helps explain why an effect might be plausible, but it does not by itself establish the size, durability, or safety of a human healthspan effect.","candidate_sources":[{"source_id":"source_1","study":"Effects of multimodal agility-like exercise training compared to inactive controls and alternative training on physical performance in older adults: a systematic review and meta-analysis","doi":"10.1186/s11556-021-00256-y","url":"https://doi.org/10.1186/s11556-021-00256-y","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"review-level"},{"source_id":"source_2","study":"The benefits of regular aerobic exercise training on cerebrovascular function and cognition in older adults","doi":"10.1007/s00421-023-05154-y","url":"https://doi.org/10.1007/s00421-023-05154-y","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"primary"},{"source_id":"source_3","study":"5 Years of Exercise Intervention Did Not Benefit Cognition Compared to the Physical Activity Guidelines in Older Adults, but Higher Cardiorespiratory Fitness Did. 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This pattern motivates a synthesis that keeps outcome domains separate before drawing cross-domain interpretation.","candidate_sources":[{"source_id":"source_1","study":"Effects of multimodal agility-like exercise training compared to inactive controls and alternative training on physical performance in older adults: a systematic review and meta-analysis","doi":"10.1186/s11556-021-00256-y","url":"https://doi.org/10.1186/s11556-021-00256-y","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"review-level"},{"source_id":"source_2","study":"The benefits of regular aerobic exercise training on cerebrovascular function and cognition in older adults","doi":"10.1007/s00421-023-05154-y","url":"https://doi.org/10.1007/s00421-023-05154-y","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"primary"},{"source_id":"source_3","study":"5 Years of Exercise Intervention Did Not Benefit Cognition Compared to the Physical Activity Guidelines in Older Adults, but Higher Cardiorespiratory Fitness Did. 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Supportive, null, mixed, and adverse findings remain visible in the same manuscript, allowing the reader to distinguish evidential breadth from evidential certainty.","candidate_sources":[{"source_id":"source_1","study":"Effects of multimodal agility-like exercise training compared to inactive controls and alternative training on physical performance in older adults: a systematic review and meta-analysis","doi":"10.1186/s11556-021-00256-y","url":"https://doi.org/10.1186/s11556-021-00256-y","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"review-level"},{"source_id":"source_2","study":"The benefits of regular aerobic exercise training on cerebrovascular function and cognition in older adults","doi":"10.1007/s00421-023-05154-y","url":"https://doi.org/10.1007/s00421-023-05154-y","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"primary"},{"source_id":"source_3","study":"5 Years of Exercise Intervention Did Not Benefit Cognition Compared to the Physical Activity Guidelines in Older Adults, but Higher Cardiorespiratory Fitness Did. A Generation 100 Substudy","doi":"10.3389/fnagi.2021.742587","url":"https://doi.org/10.3389/fnagi.2021.742587","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"primary"},{"source_id":"source_4","study":"Effects of 5-Year Exercise Training on Cognition in Older Adults: 10-Years Follow-Up from the Generation 100 Study","doi":"10.1186/s40798-025-00956-0","url":"https://doi.org/10.1186/s40798-025-00956-0","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"primary"},{"source_id":"source_5","study":"Efficacy of traditional Chinese exercises on cognitive function in older adults: a systematic review and meta-analysis of randomised controlled trials","doi":"10.1093/ageing/afag168","url":"https://doi.org/10.1093/ageing/afag168","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"review-level"}]},{"claim_id":"claim_19","claim":"The resulting paper is therefore a calibrated synthesis: it can identify plausible mechanisms, observed direct signals when present, unresolved tensions, and trial-design priorities without converting them into claims stronger than the retained corpus can support.","candidate_sources":[{"source_id":"source_1","study":"Effects of multimodal agility-like exercise training compared to inactive controls and alternative training on physical performance in older adults: a systematic review and meta-analysis","doi":"10.1186/s11556-021-00256-y","url":"https://doi.org/10.1186/s11556-021-00256-y","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"review-level"},{"source_id":"source_2","study":"The benefits of regular aerobic exercise training on cerebrovascular function and cognition in older adults","doi":"10.1007/s00421-023-05154-y","url":"https://doi.org/10.1007/s00421-023-05154-y","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"primary"},{"source_id":"source_3","study":"5 Years of Exercise Intervention Did Not Benefit Cognition Compared to the Physical Activity Guidelines in Older Adults, but Higher Cardiorespiratory Fitness Did. A Generation 100 Substudy","doi":"10.3389/fnagi.2021.742587","url":"https://doi.org/10.3389/fnagi.2021.742587","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"primary"},{"source_id":"source_4","study":"Effects of 5-Year Exercise Training on Cognition in Older Adults: 10-Years Follow-Up from the Generation 100 Study","doi":"10.1186/s40798-025-00956-0","url":"https://doi.org/10.1186/s40798-025-00956-0","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"primary"},{"source_id":"source_5","study":"Efficacy of traditional Chinese exercises on cognitive function in older adults: a systematic review and meta-analysis of randomised controlled trials","doi":"10.1093/ageing/afag168","url":"https://doi.org/10.1093/ageing/afag168","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"review-level"}]},{"claim_id":"claim_20","claim":"The following fields were extracted from each included source: study design, population / cohort, intervention or exposure, comparator, outcome class, effect direction, effect size, confidence interval or credible interval, p-value, sample size, follow-up duration, risk-of-bias rating. Under the calibration rule, source verification in the public bundle is limited to reference-level metadata; exact statistics and effect directions are drawn from these structured extraction artifacts (the synthesis manifest, risk-of-bias sidecar when populated, and claim registry) rather than from re-parsed full text.","candidate_sources":[{"source_id":"source_1","study":"Effects of multimodal agility-like exercise training compared to inactive controls and alternative training on physical performance in older adults: a systematic review and meta-analysis","doi":"10.1186/s11556-021-00256-y","url":"https://doi.org/10.1186/s11556-021-00256-y","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"review-level"},{"source_id":"source_2","study":"The benefits of regular aerobic exercise training on cerebrovascular function and cognition in older adults","doi":"10.1007/s00421-023-05154-y","url":"https://doi.org/10.1007/s00421-023-05154-y","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"primary"},{"source_id":"source_3","study":"5 Years of Exercise Intervention Did Not Benefit Cognition Compared to the Physical Activity Guidelines in Older Adults, but Higher Cardiorespiratory Fitness Did. 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Public appraisal claims are limited to populated `risk_of_bias.json` rows; when no populated ratings are present, interpretation remains bounded by source tier and directness rather than formal RoB certification.","candidate_sources":[{"source_id":"source_1","study":"Effects of multimodal agility-like exercise training compared to inactive controls and alternative training on physical performance in older adults: a systematic review and meta-analysis","doi":"10.1186/s11556-021-00256-y","url":"https://doi.org/10.1186/s11556-021-00256-y","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"review-level"},{"source_id":"source_2","study":"The benefits of regular aerobic exercise training on cerebrovascular function and cognition in older adults","doi":"10.1007/s00421-023-05154-y","url":"https://doi.org/10.1007/s00421-023-05154-y","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"primary"},{"source_id":"source_3","study":"5 Years of Exercise Intervention Did Not Benefit Cognition Compared to the Physical Activity Guidelines in Older Adults, but Higher Cardiorespiratory Fitness Did. A Generation 100 Substudy","doi":"10.3389/fnagi.2021.742587","url":"https://doi.org/10.3389/fnagi.2021.742587","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"primary"},{"source_id":"source_4","study":"Effects of 5-Year Exercise Training on Cognition in Older Adults: 10-Years Follow-Up from the Generation 100 Study","doi":"10.1186/s40798-025-00956-0","url":"https://doi.org/10.1186/s40798-025-00956-0","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"primary"},{"source_id":"source_5","study":"Efficacy of traditional Chinese exercises on cognitive function in older adults: a systematic review and meta-analysis of randomised controlled trials","doi":"10.1093/ageing/afag168","url":"https://doi.org/10.1093/ageing/afag168","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"review-level"}]},{"claim_id":"claim_22","claim":"Evidence-tension synthesis: claims grouped by outcome class (cardiometabolic, cognitive, contextual adjacent evidence, deficiency prevalence, dosing and pharmacokinetics, frailty, immune and inflammation, muscle function, safety and comorbidity); within-class agreement, disagreement, and directness gaps surfaced explicitly. Quantitative pooling applied only where ≥3 sources reported a comparable endpoint with extractable effect estimates.","candidate_sources":[{"source_id":"source_1","study":"Effects of multimodal agility-like exercise training compared to inactive controls and alternative training on physical performance in older adults: a systematic review and meta-analysis","doi":"10.1186/s11556-021-00256-y","url":"https://doi.org/10.1186/s11556-021-00256-y","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"review-level"},{"source_id":"source_2","study":"The benefits of regular aerobic exercise training on cerebrovascular function and cognition in older adults","doi":"10.1007/s00421-023-05154-y","url":"https://doi.org/10.1007/s00421-023-05154-y","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"primary"},{"source_id":"source_3","study":"5 Years of Exercise Intervention Did Not Benefit Cognition Compared to the Physical Activity Guidelines in Older Adults, but Higher Cardiorespiratory Fitness Did. A Generation 100 Substudy","doi":"10.3389/fnagi.2021.742587","url":"https://doi.org/10.3389/fnagi.2021.742587","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"primary"},{"source_id":"source_4","study":"Effects of 5-Year Exercise Training on Cognition in Older Adults: 10-Years Follow-Up from the Generation 100 Study","doi":"10.1186/s40798-025-00956-0","url":"https://doi.org/10.1186/s40798-025-00956-0","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"primary"},{"source_id":"source_5","study":"Efficacy of traditional Chinese exercises on cognitive function in older adults: a systematic review and meta-analysis of randomised controlled trials","doi":"10.1093/ageing/afag168","url":"https://doi.org/10.1093/ageing/afag168","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"review-level"}]},{"claim_id":"claim_23","claim":"Source retrieval, claim extraction, evidence routing, and prose drafting were assisted by large language models under a deterministic audit-trail protocol. Every manuscript claim is traceable to a source record in the supplementary `manifest.json`. Final eligibility and interpretation decisions are author-verified.","candidate_sources":[{"source_id":"source_1","study":"Effects of multimodal agility-like exercise training compared to inactive controls and alternative training on physical performance in older adults: a systematic review and meta-analysis","doi":"10.1186/s11556-021-00256-y","url":"https://doi.org/10.1186/s11556-021-00256-y","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"review-level"},{"source_id":"source_2","study":"The benefits of regular aerobic exercise training on cerebrovascular function and cognition in older adults","doi":"10.1007/s00421-023-05154-y","url":"https://doi.org/10.1007/s00421-023-05154-y","support_kind":"candidate_source_row","population":"not extracted","endpoint":"not extracted","effect":"not extracted","directness":"primary"},{"source_id":"source_3","study":"5 Years of Exercise Intervention Did Not Benefit Cognition Compared to the Physical Activity Guidelines in Older Adults, but Higher Cardiorespiratory Fitness Did. 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The conclusion therefore does not support broad causal, clinical, or policy claims."},{"id":"claim_2","type":"claim","text":"This paper synthesizes evidence on exercise cognition effects across 41 included source papers and 1801 high-confidence extracted claims."},{"id":"claim_3","type":"claim","text":"The evidence profile contains 5 direct clinical sources, 36 adjacent clinical sources, and no sources classified primarily as mechanistic or model-system evidence, with a high-density pairwise disagreement map across the evidence base."},{"id":"claim_4","type":"claim","text":"Positive study-level signals are summarized in the dosing and pharmacokinetics outcome class; null signals are summarized in the cognitive and safety and comorbidity outcome classes; negative signals are not the dominant direction in any outcome class; mixed or heterogeneous signals are summarized in the contextual adjacent evidence, muscle function, cardiometabolic, deficiency prevalence, frailty, and immune and inflammation outcome classes. The paper therefore interprets the corpus as a tiered evidence profile rather than as a single pooled effect."},{"id":"claim_5","type":"claim","text":"The conclusion is that exercise cognition effects should be treated as a bounded geroscience hypothesis: the retained clinical and adjacent evidence profile defines the scope for targeted testing, while mixed and null findings limit any unqualified anti-aging claim."},{"id":"claim_6","type":"claim","text":"For that reason, the manuscript does not collapse every source into a single recommendation. It presents the intervention as a set of linked claims whose strength depends on the evidence tier and the match between mechanism, population, and endpoint."},{"id":"claim_7","type":"claim","text":"This synthesis evaluates evidence on exercise cognition effects across 41 included source papers and 1801 high-confidence extracted claims. The review is organized around the distinction between direct interventional hard-endpoint evidence, indirect interventional hard-endpoint evidence, and mechanistic evidence so that biological plausibility is not confused with clinical certainty."},{"id":"claim_8","type":"claim","text":"The corpus contains 5 direct clinical sources, 36 adjacent clinical sources, and no sources classified primarily as mechanistic or model-system evidence. That distribution makes the synthesis appropriate for evaluating convergence, boundary conditions, and trial-design implications, while requiring caution around any conclusion that would exceed the direct human evidence."},{"id":"claim_9","type":"claim","text":"The thesis is: Across 41 curated reference papers, the evidence base for exercise cognition effects shows a context-dependent profile. Positive signals appear in: contextual other, muscle function. Negative signals appear in: cardiometabolic. Null findings dominate: contextual other, cognitive. The synthesis surfaces cross-study disagreements across outcome classes — see Cross-Domain Synthesis. The exercise cognition effects anti-aging case as currently constituted is incomplete: mechanistic plausibility coexists with mixed or sparse human-RCT evidence, and the boundary conditions remain to be established. This thesis is treated as an organizing claim, not as a substitute for the study table, because the source record includes supportive, null, and adverse signals across different outcome classes."},{"id":"claim_10","type":"claim","text":"This distinction matters for publication because it makes the paper falsifiable. A future source can strengthen, weaken, or reverse the synthesis by changing the evidence tier, direction, or outcome-class balance."},{"id":"claim_11","type":"claim","text":"The mechanistic layer is most useful when it explains why a trial signal might appear or fail to appear. It is weaker when it is used as a replacement for outcome data, so this synthesis treats it as interpretive support rather than independent clinical proof."},{"id":"claim_12","type":"claim","text":"Null findings have a specific role in this evidence model. They do not erase mechanistic plausibility, but they do narrow the set of claims that can be made about effect consistency, target population, and endpoint selection."},{"id":"claim_13","type":"claim","text":"Adverse or negative signals are likewise retained in the main interpretation. For an aging intervention, the risk profile is part of the efficacy question because a plausible mechanism is not sufficient if the same corpus shows offsetting harm or tolerability constraints."},{"id":"claim_14","type":"claim","text":"The evidence base also distinguishes breadth from certainty. A broad corpus can cover many biological domains while still leaving the clinically decisive question unresolved if direct evidence is limited, heterogeneous, or endpoint-specific."},{"id":"claim_15","type":"claim","text":"The background evidence for exercise cognition effects is heterogeneous rather than uniformly confirmatory. Direct clinical sources such as Tan 2023, Khan 2026, Leischik 2021 are interpreted separately from mechanistic studies such as the retained evidence base, because these evidence roles answer different questions about aging biology and clinical translation."},{"id":"claim_16","type":"claim","text":"The direct evidence establishes what has been observed in human or adjacent clinical settings. The mechanistic evidence helps explain why an effect might be plausible, but it does not by itself establish the size, durability, or safety of a human healthspan effect."},{"id":"claim_17","type":"claim","text":"Across the retained sources, positive signals cluster around the contextual adjacent evidence, muscle function and cognitive outcome classes; null signals around the contextual adjacent evidence, cognitive and cardiometabolic outcome classes; and negative or adverse signals around the cardiometabolic outcome class. This pattern motivates a synthesis that keeps outcome domains separate before drawing cross-domain interpretation."},{"id":"claim_18","type":"claim","text":"The study-level structure also prevents selective emphasis. Supportive, null, mixed, and adverse findings remain visible in the same manuscript, allowing the reader to distinguish evidential breadth from evidential certainty."},{"id":"claim_19","type":"claim","text":"The resulting paper is therefore a calibrated synthesis: it can identify plausible mechanisms, observed direct signals when present, unresolved tensions, and trial-design priorities without converting them into claims stronger than the retained corpus can support."},{"id":"claim_20","type":"claim","text":"The following fields were extracted from each included source: study design, population / cohort, intervention or exposure, comparator, outcome class, effect direction, effect size, confidence interval or credible interval, p-value, sample size, follow-up duration, risk-of-bias rating. Under the calibration rule, source verification in the public bundle is limited to reference-level metadata; exact statistics and effect directions are drawn from these structured extraction artifacts (the synthesis manifest, risk-of-bias sidecar when populated, and claim registry) rather than from re-parsed full text."},{"id":"claim_21","type":"claim","text":"Risk-of-bias framework assignment follows study design (RoB-2 for RCTs, ROBINS-I for non-randomised studies, AMSTAR-2 for systematic reviews / meta-analyses). Public appraisal claims are limited to populated `risk_of_bias.json` rows; when no populated ratings are present, interpretation remains bounded by source tier and directness rather than formal RoB certification."},{"id":"claim_22","type":"claim","text":"Evidence-tension synthesis: claims grouped by outcome class (cardiometabolic, cognitive, contextual adjacent evidence, deficiency prevalence, dosing and pharmacokinetics, frailty, immune and inflammation, muscle function, safety and comorbidity); within-class agreement, disagreement, and directness gaps surfaced explicitly. Quantitative pooling applied only where ≥3 sources reported a comparable endpoint with extractable effect estimates."},{"id":"claim_23","type":"claim","text":"Source retrieval, claim extraction, evidence routing, and prose drafting were assisted by large language models under a deterministic audit-trail protocol. Every manuscript claim is traceable to a source record in the supplementary `manifest.json`. Final eligibility and interpretation decisions are author-verified."},{"id":"claim_24","type":"claim","text":"| Evidence domain | Corpus slice | Strongest signal | Directness | Main limitation |"},{"id":"claim_25","type":"claim","text":"| Exercise Cognition Effects / Contextual Adjacent Evidence | n=24; claims=1044 | significant source statistic in 18/24 sources; receipt-level direction coded unclear | 3 direct; 13 indirect; 1 protocol; 7 review | limited corpus depth in this outcome class |"},{"id":"claim_26","type":"claim","text":"| Exercise Cognition Effects / Cognitive | n=6; claims=126 | significant source statistic in 2/6 sources; receipt-level direction coded null | 1 direct; 2 indirect; 3 review | limited corpus depth in this outcome class |"},{"id":"claim_27","type":"claim","text":"| Exercise Cognition Effects / Cardiometabolic | n=2; claims=76 | significant source statistic in 2/2 sources; receipt-level direction coded null | 2 indirect | limited corpus depth in this outcome class |"},{"id":"claim_28","type":"claim","text":"Skeletal and muscle context: 3 sources; significant source statistic in 1/3 sources; receipt-level direction coded null."},{"id":"claim_29","type":"claim","text":"Outcome-class note:** Contextual Adjacent Evidence denotes background, boundary-condition, or adjacent-outcome sources. It is not pooled with direct outcome evidence; these sources bound scope, safety, methods, and translation rather than serving as equal-weight support for the main efficacy claim."},{"id":"claim_30","type":"claim","text":"Contextual Adjacent Evidence: n=24; claims=1044; mixed signal in 12/24 sources | directness: 3 direct; 13 indirect; 7 review; 1 protocol; main limitation: directionally heterogeneous."},{"id":"source_1","type":"source","study":"Effects of multimodal agility-like exercise training compared to inactive controls and alternative training on physical performance in older adults: a systematic review and meta-analysis","year":2021,"doi":"10.1186/s11556-021-00256-y","url":"https://doi.org/10.1186/s11556-021-00256-y","population":"not extracted","intervention_or_exposure":"not extracted","comparator":"not extracted","endpoint":"not extracted","effect":"not extracted","risk_of_bias":"not appraised in public sidecar","directness":"review-level"},{"id":"source_2","type":"source","study":"The benefits of regular aerobic exercise training on cerebrovascular function and cognition in older adults","year":2023,"doi":"10.1007/s00421-023-05154-y","url":"https://doi.org/10.1007/s00421-023-05154-y","population":"not extracted","intervention_or_exposure":"not extracted","comparator":"not extracted","endpoint":"not extracted","effect":"not extracted","risk_of_bias":"not appraised in public sidecar","directness":"primary"},{"id":"source_3","type":"source","study":"5 Years of Exercise Intervention Did Not Benefit Cognition Compared to the Physical Activity Guidelines in Older Adults, but Higher Cardiorespiratory Fitness Did. 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Mass in Pre-Frail Older Adults in the Primary Care Setting: A Cluster Randomized Controlled Trial","year":2023,"doi":"10.1007/s12603-023-1928-7","url":"https://doi.org/10.1007/s12603-023-1928-7","population":"not extracted","intervention_or_exposure":"not extracted","comparator":"not extracted","endpoint":"not extracted","effect":"not extracted","risk_of_bias":"not appraised in public sidecar","directness":"primary"},{"id":"source_8","type":"source","study":"Effects of digitalized traditional Chinese exercises on the physical and mental health and quality of life of older adults: a systematic review and meta-analysis of randomized controlled trials","year":2025,"doi":"10.3389/fpubh.2025.1725847","url":"https://doi.org/10.3389/fpubh.2025.1725847","population":"not extracted","intervention_or_exposure":"not extracted","comparator":"not extracted","endpoint":"not extracted","effect":"not extracted","risk_of_bias":"not appraised in public sidecar","directness":"review-level"},{"id":"source_9","type":"source","study":"Mind body exercise improves cognitive function more than aerobic- and resistance exercise in healthy adults aged 55 years and older – an umbrella review","year":2023,"doi":"10.1186/s11556-023-00325-4","url":"https://doi.org/10.1186/s11556-023-00325-4","population":"not extracted","intervention_or_exposure":"not extracted","comparator":"not extracted","endpoint":"not extracted","effect":"not extracted","risk_of_bias":"not appraised in public sidecar","directness":"review-level"},{"id":"source_10","type":"source","study":"Effects of aerobic exercise and computer-based cognitive training on cognition, functional independence, quality of life, and salivary cortisol levels in older adults with mild cognitive impairment: a randomized trial","year":2026,"doi":"10.3389/fnagi.2026.1776069","url":"https://doi.org/10.3389/fnagi.2026.1776069","population":"not extracted","intervention_or_exposure":"not 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Exercise and Its Effects on Cognitive Performance and Neurobiological Markers in Adults: A Scoping Review","year":2026,"doi":"10.3390/muscles5020025","url":"https://doi.org/10.3390/muscles5020025","population":"not extracted","intervention_or_exposure":"not extracted","comparator":"not extracted","endpoint":"not extracted","effect":"not extracted","risk_of_bias":"not appraised in public sidecar","directness":"review-level"},{"id":"source_29","type":"source","study":"Effect of preoperative cognitive and physical optimization in the prevention of postoperative cognitive deficit in elderly patients with lung resection – cognition trial","year":2025,"doi":"10.1186/s13063-025-08894-8","url":"https://doi.org/10.1186/s13063-025-08894-8","population":"not extracted","intervention_or_exposure":"not extracted","comparator":"not extracted","endpoint":"not extracted","effect":"not extracted","risk_of_bias":"not appraised in public sidecar","directness":"primary"},{"id":"source_30","type":"source","study":"EFFECTS OF HIGH-INTENSITY AQUATIC EXERCISE ON INFLAMMATION AND COGNITION IN OLDER ADULTS WITH MCI","year":2023,"doi":"10.1093/geroni/igad104.3293","url":"https://doi.org/10.1093/geroni/igad104.3293","population":"not extracted","intervention_or_exposure":"not extracted","comparator":"not extracted","endpoint":"not extracted","effect":"not extracted","risk_of_bias":"not appraised in public sidecar","directness":"primary"},{"id":"source_31","type":"source","study":"Nature-based and technology-assisted exercise for cognitive and mobility outcomes in older adults: a systematic review of randomized trials","year":2026,"doi":"10.1186/s12877-026-06978-x","url":"https://doi.org/10.1186/s12877-026-06978-x","population":"not extracted","intervention_or_exposure":"not extracted","comparator":"not extracted","endpoint":"not extracted","effect":"not extracted","risk_of_bias":"not appraised in public sidecar","directness":"review-level"},{"id":"source_32","type":"source","study":"The effect of physical exercise and cognition-orientated interventions on post-stroke cognitive function: Protocol for an overview of reviews","year":2025,"doi":"10.1371/journal.pone.0318567","url":"https://doi.org/10.1371/journal.pone.0318567","population":"not extracted","intervention_or_exposure":"not extracted","comparator":"not extracted","endpoint":"not extracted","effect":"not extracted","risk_of_bias":"not appraised in public sidecar","directness":"primary"},{"id":"source_33","type":"source","study":"EFFECTS OF HOME-BASED COGNITIVE AND PHYSICAL EXERCISE TRAINING ON COGNITION IN OLDER ADULTS: THE COVEPIC TRIAL","year":2024,"doi":"10.1093/geroni/igae098.2186","url":"https://doi.org/10.1093/geroni/igae098.2186","population":"not extracted","intervention_or_exposure":"not extracted","comparator":"not extracted","endpoint":"not extracted","effect":"not extracted","risk_of_bias":"not appraised in public sidecar","directness":"primary"},{"id":"source_34","type":"source","study":"Effects of exercise interventions on cognition, physical function and quality of life among older adults with cognitive frailty: A systematic review and meta-analysis.","year":2025,"doi":"10.1016/j.gerinurse.2025.01.006","url":"https://doi.org/10.1016/j.gerinurse.2025.01.006","population":"not extracted","intervention_or_exposure":"not extracted","comparator":"not extracted","endpoint":"not extracted","effect":"not extracted","risk_of_bias":"not appraised in public sidecar","directness":"review-level"},{"id":"source_35","type":"source","study":"Physical exercise and cognition in older adults, a scientific approach scanty reported in Latin America and Caribbean populations","year":2024,"doi":"10.3389/fspor.2024.1368593","url":"https://doi.org/10.3389/fspor.2024.1368593","population":"not extracted","intervention_or_exposure":"not extracted","comparator":"not extracted","endpoint":"not extracted","effect":"not 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extracted","risk_of_bias":"not appraised in public sidecar","directness":"primary"},{"id":"source_40","type":"source","study":"Multicomponent Exercise on Physical Function, Cognition and Hemodynamic Parameters of Community-Dwelling Older Adults: A Quasi-Experimental Study","year":2019,"doi":"10.3390/ijerph16122184","url":"https://doi.org/10.3390/ijerph16122184","population":"not extracted","intervention_or_exposure":"not extracted","comparator":"not extracted","endpoint":"not extracted","effect":"not extracted","risk_of_bias":"not appraised in public sidecar","directness":"primary"},{"id":"source_41","type":"source","study":"Effect of Exercise on Cognition, Conditioning, Muscle Endurance, and Balance in Older Adults With Mild Cognitive Impairment: A Randomized Controlled Trial","year":2019,"doi":"10.1519/jpt.0000000000000191","url":"https://doi.org/10.1519/jpt.0000000000000191","population":"not extracted","intervention_or_exposure":"not extracted","comparator":"not extracted","endpoint":"not extracted","effect":"not extracted","risk_of_bias":"not appraised in public sidecar","directness":"primary"},{"id":"source_42","type":"source","study":"**Outcome class** is assigned from the source's bound endpoint, population, and claim text; adjacent/background sources are separated from clinical outcome slices.","year":null,"doi":null,"url":null,"population":"not extracted","intervention_or_exposure":"not extracted","comparator":"not extracted","endpoint":"not extracted","effect":"not extracted","risk_of_bias":"not appraised in public sidecar","directness":"citation"},{"id":"source_43","type":"source","study":"**Directness** is coded as direct only when a source tests the topic against a clinically proximate outcome in the relevant population; a qualifying direct source would be a human interventional or hard-endpoint study of the topic itself. Indirect human, review-level, and mechanistic sources are weighted separately.","year":null,"doi":null,"url":null,"population":"not extracted","intervention_or_exposure":"not extracted","comparator":"not extracted","endpoint":"not extracted","effect":"not extracted","risk_of_bias":"not appraised in public sidecar","directness":"citation"},{"id":"source_44","type":"source","study":"**Directional signal** is counted within the assigned outcome class only. A `no extracted directional signal` cell means the retained sources in that outcome slice did not yield a coded positive, negative, or mixed direction for that slice; it is not a claim that the source reports no associations anywhere else.","year":null,"doi":null,"url":null,"population":"not extracted","intervention_or_exposure":"not extracted","comparator":"not extracted","endpoint":"not extracted","effect":"not extracted","risk_of_bias":"not appraised in public sidecar","directness":"citation"},{"id":"source_45","type":"source","study":"**Evidence tier** follows the deterministic tier/directness taxonomy used in the source builder; the prose writer cannot move a source between classes after sources are frozen.","year":null,"doi":null,"url":null,"population":"not extracted","intervention_or_exposure":"not extracted","comparator":"not extracted","endpoint":"not extracted","effect":"not extracted","risk_of_bias":"not appraised in public 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candidate receipts retained after source retrieval, deduplication, and topic filtering. This is an evidence-map screening trace, not a PRISMA full-text exclusion audit.","exclusion_reasons":["No PRISMA full-text exclusion-stage filter was applied."]}}},{"name":"contradiction_map.json","media_type":"application/json","content":{"publication_id":"67cf5fb4-7f00-4a8d-a4d3-c4dec0ac54b5","screening":{"identified":41,"screened":41,"excluded":0,"included":41,"included_or_retained":41,"flow":["identified","screened","excluded_with_reasons","included"],"wording":"41 candidate receipts retained after source retrieval, deduplication, and topic filtering. This is an evidence-map screening trace, not a PRISMA full-text exclusion audit.","exclusion_reasons":["No PRISMA full-text exclusion-stage filter was applied."]},"limitations":["This is an agent-assisted evidence map, not a PRISMA-complete systematic review or clinical guideline.","It is not PROSPERO-registered and should not be read as medical advice.","Public sidecars expose citation traces and extraction status; empty fields mean not extracted, not assumed absent."],"contradictions":["Positive study-level signals are summarized in the dosing and pharmacokinetics outcome class; null signals are summarized in the cognitive and safety and comorbidity outcome classes; negative signals are not the dominant direction in any outcome class; mixed or heterogeneous signals are summarized in the contextual adjacent evidence, muscle function, cardiometabolic, deficiency prevalence, frailty, and immune and inflammation outcome classes. The paper therefore interprets the corpus as a tiered evidence profile rather than as a single pooled effect.","The conclusion is that exercise cognition effects should be treated as a bounded geroscience hypothesis: the retained clinical and adjacent evidence profile defines the scope for targeted testing, while mixed and null findings limit any unqualified anti-aging claim.","The corpus contains 5 direct clinical sources, 36 adjacent clinical sources, and no sources classified primarily as mechanistic or model-system evidence. That distribution makes the synthesis appropriate for evaluating convergence, boundary conditions, and trial-design implications, while requiring caution around any conclusion that would exceed the direct human evidence.","The thesis is: Across 41 curated reference papers, the evidence base for exercise cognition effects shows a context-dependent profile. Positive signals appear in: contextual other, muscle function. Negative signals appear in: cardiometabolic. Null findings dominate: contextual other, cognitive. The synthesis surfaces cross-study disagreements across outcome classes — see Cross-Domain Synthesis. The exercise cognition effects anti-aging case as currently constituted is incomplete: mechanistic plausibility coexists with mixed or sparse human-RCT evidence, and the boundary conditions remain to be established. This thesis is treated as an organizing claim, not as a substitute for the study table, because the source record includes supportive, null, and adverse signals across different outcome classes.","Null findings have a specific role in this evidence model. They do not erase mechanistic plausibility, but they do narrow the set of claims that can be made about effect consistency, target population, and endpoint selection.","The evidence base also distinguishes breadth from certainty. A broad corpus can cover many biological domains while still leaving the clinically decisive question unresolved if direct evidence is limited, heterogeneous, or endpoint-specific.","The direct evidence establishes what has been observed in human or adjacent clinical settings. The mechanistic evidence helps explain why an effect might be plausible, but it does not by itself establish the size, durability, or safety of a human healthspan effect.","The study-level structure also prevents selective emphasis. Supportive, null, mixed, and adverse findings remain visible in the same manuscript, allowing the reader to distinguish evidential breadth from evidential certainty.","Contextual Adjacent Evidence: n=24; claims=1044; mixed signal in 12/24 sources | directness: 3 direct; 13 indirect; 7 review; 1 protocol; main limitation: directionally heterogeneous."]}},{"name":"evidence_table.csv","media_type":"text/csv","content":"study,population,intervention_or_exposure,comparator,endpoint,effect,risk_of_bias,directness\r\nEffects of multimodal agility-like exercise training compared to inactive controls and alternative training on physical performance in older adults: a systematic review and meta-analysis,not extracted,not extracted,not extracted,not extracted,not extracted,not appraised in public sidecar,review-level\r\nThe benefits of regular aerobic exercise training on cerebrovascular function and cognition in older adults,not extracted,not extracted,not extracted,not extracted,not extracted,not appraised in public sidecar,primary\r\n\"5 Years of Exercise Intervention Did Not Benefit Cognition Compared to the Physical Activity Guidelines in Older Adults, but Higher Cardiorespiratory Fitness Did. A Generation 100 Substudy\",not extracted,not extracted,not extracted,not extracted,not extracted,not appraised in public sidecar,primary\r\nEffects of 5-Year Exercise Training on Cognition in Older Adults: 10-Years Follow-Up from the Generation 100 Study,not extracted,not extracted,not extracted,not extracted,not extracted,not appraised in public sidecar,primary\r\nEfficacy of traditional Chinese exercises on cognitive function in older adults: a systematic review and meta-analysis of randomised controlled trials,not extracted,not extracted,not extracted,not extracted,not extracted,not appraised in public sidecar,review-level\r\nEffects of aerobic exercise on cognitive function in older adults with mild cognitive impairment: a systematic review and meta-analysis,not extracted,not extracted,not extracted,not extracted,not extracted,not appraised in public sidecar,review-level\r\n\"Impact of Exercise and Cognitive Stimulation Therapy on Physical Function, Cognition and Muscle Mass in Pre-Frail Older Adults in the Primary Care Setting: A Cluster Randomized Controlled Trial\",not extracted,not extracted,not extracted,not extracted,not extracted,not appraised in public sidecar,primary\r\nEffects of digitalized traditional Chinese exercises on the physical and mental health and quality of life of older adults: a systematic review and meta-analysis of randomized controlled trials,not extracted,not extracted,not extracted,not extracted,not extracted,not appraised in public sidecar,review-level\r\nMind body exercise improves cognitive function more than aerobic- and resistance exercise in healthy adults aged 55 years and older – an umbrella review,not extracted,not extracted,not extracted,not extracted,not extracted,not appraised in public sidecar,review-level\r\n\"Effects of aerobic exercise and computer-based cognitive training on cognition, functional independence, quality of life, and salivary cortisol levels in older adults with mild cognitive impairment: a randomized trial\",not extracted,not extracted,not extracted,not extracted,not extracted,not appraised in public sidecar,primary\r\n\"Effects of exercise, cognitive, and dual-task interventions on cognition in type 2 diabetes mellitus: A systematic review and meta-analysis\",not extracted,not extracted,not extracted,not extracted,not extracted,not appraised in public sidecar,review-level\r\n\"Wuqinxi exercise for mind and balance: Enhancing cognition, fall prevention, and quality of life in older adults with mild cognitive impairment\",not extracted,not extracted,not extracted,not extracted,not extracted,not appraised in public sidecar,primary\r\nLongitudinal effects of exercise according to the World Health Organization guidelines on cognitive function in middle-aged and older adults,not extracted,not extracted,not extracted,not extracted,not extracted,not appraised in public sidecar,primary\r\n\"Traditional Chinese exercise for quality of life, cognition, sleep in Parkinson’s disease: a systematic review and meta-analysis\",not extracted,not extracted,not extracted,not extracted,not extracted,not appraised in public sidecar,review-level\r\n\"The Effects of Aerobic Exercise Training on Cerebrovascular and Cognitive Function in Sedentary, Obese, Older Adults\",not extracted,not extracted,not extracted,not extracted,not extracted,not appraised in public sidecar,primary\r\nOptimal type and dose of exercise to improve cognitive function in healthy and pre-sarcopenic older adults: a bayesian network meta-analysis of randomized controlled trials,not extracted,not extracted,not extracted,not extracted,not extracted,not appraised in public sidecar,review-level\r\nBiological sex as a tailoring variable for exercise prescription in hospitalized older adults,not extracted,not extracted,not extracted,not extracted,not extracted,not appraised in public sidecar,primary\r\nLarge-Scale Network Connectivity and Cognitive Function Changes After Exercise Training in Older 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