The Role of Physical Exercise in Cognitive Preservation: A Systematic Review
Bibliographic record
Abstract
Dementia, or major neurocognitive disorder, is one of the most common causes of disability and dependency in older adults with far-reaching social, physical, and economic impacts. In the absence of adequate treatment, much research has been directed towards prevention. Physical exercise has been shown to increase cerebral blood flow, amplify production of neurotrophic factors, and enhance brain volume. Whether these changes on a structural and cellular level result in cognitive preservation is less clear. This systematic review synthesizes findings from seventeen randomized controlled trials that examine the effects of physical activity on global cognition, memory, and executive function in older adults. Cognitive benefits of exercise are strongest for those who are cognitively intact or with mild cognitive impairment. In studies with long-term follow up, cognitive gains tended to decay after cessation of physical intervention suggesting that sustained physical exercise may be required to preserve cognitive function in older adults prior to onset of dementia.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.004 | 0.006 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.006 | 0.001 |
| Bibliometrics | 0.001 | 0.002 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".