Protective effects of physical activity on episodic memory during aging are explained by executive functioning
DOI: 10.1186/s11556-024-00341-y
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Summary
This study investigates whether the protective effects of physical activity (PA) on episodic memory during aging are mediated by executive functioning. While previous research has established that PA benefits both executive functions and memory, and that executive decline contributes to memory loss in older adults, the specific relationship between these three variables had not been directly tested. The authors aimed to determine if PA protects against age-related memory decline by reducing the decline in executive resources, thereby supporting the executive hypothesis of aging. The study included 19 young adults (mean age 27.16) and 25 older adults (mean age 69.64). Participants completed a resource-dependent episodic memory task, which required maintaining a working memory load during word encoding, and three executive function tasks assessing updating, inhibition, and flexibility. PA levels were measured using a self-report questionnaire assessing leisure and sports activities. Statistical analyses included generalized linear models to assess age and PA effects, and mediation analyses using a causal steps approach with non-parametric bootstrapping to examine the pathways between age, PA, executive functioning, and memory performance. Results confirmed significant age-related declines in both episodic memory and executive functioning. PA was positively correlated with performance in both domains, but this relationship was significant only in older adults. Mediation analyses revealed that while executive functioning mediated the effect of age on memory, PA was the strongest predictor of memory performance. Crucially, when PA was included in the model, the direct effects of both age and executive functioning on memory became non-significant. The analysis identified a significant serial indirect pathway where age affected executive functioning, which in turn was predicted by PA, ultimately influencing memory. This indicates that PA mediates the effects of age and executive functions on episodic memory. The findings suggest that physical activity protects older adults against episodic memory decline primarily by preserving executive functioning. By maintaining higher executive resources, physically active older adults can more effectively self-initiate memory strategies required for resource-demanding tasks. This study provides the first direct evidence that the cognitive benefits of PA on memory are explained by its protective effect on executive control, positioning PA as a key factor in cognitive reserve. These results highlight the importance of considering executive mechanisms when evaluating the impact of lifestyle factors on cognitive aging.
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| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
| discover | success | OpenAlex-citations | — | — | 1 | 2026-06-19 |
| archive | success | unpaywall | — | — | 2 | 2026-06-25 |
| extract | success | cached | — | — | 2 | 2026-06-26 |
| clean | success | clean | — | — | 1 | 2026-06-19 |
| chunk | success | chunk | — | — | 1 | 2026-06-19 |
| embed | success | embed | Qwen/Qwen3-Embedding-8B | — | 1 | 2026-06-19 |
| promote | success | — | — | — | 1 | 2026-06-19 |
| summarize | success | llm | qwen3.6-27b-prismaquant | summ-v5 | 1 | 2026-06-26 |
| tag | success | vector_similarity | — | — | 6 | 2026-06-19 |
| verify | success | — | — | — | 1 | 2026-06-26 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-26; verification: verified.
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