The Effect of Exercise Intensity on Memory Consolidation
Bibliographic record
Abstract
The physiological response to stress involves activation of the fight or flight response. In particular, sympathetic nervous system (SNS) activity, circulating catecholamines and glucocorticoids (cortisol) are elevated. Acute stress is associated with enhanced memory consolidation, a result linked to catecholamine and cortisol at the time of information presentation. Since physical exercise elicits a physiological stress response, it is possible that exercise-induced stress could mimic the memory consolidation processes of other stressors. PURPOSE: To examine the effect of exercise intensity on memory consolidation. METHODS: College-aged participants (n=40; female = 18, male = 22) were shown 20 IAPS rated images (10 seconds per image) following 25 minutes of seated rest (REST; n=10) or cycle ergometer exercise designed to elicit either 40% (LOW; n=10), 60% (MOD; n=9), or 80% (HIGH; n=11) of maximal oxygen consumption. Saliva samples were taken before and after each exercise bout for the analysis of salivary cortisol. Seven days following image viewing, participants were asked to recall as many images as possible and both correct and incorrect recalls were recorded for analysis. Data are presented as means and (SD). RESULTS: Salivary cortisol change was greatest after HIGH [87.6 (154.7) μg/dL] but only significantly different than REST [4.4 (33.1) μg/dL], p<0.05. The greatest number of correctly recalled images [6.4 (3.1)] and lowest number of incorrectly recalled images [1.6 (2.2)] were observed in HIGH. However, the number of correctly recalled images in HIGH was significantly different than only the REST group [4.1 (1.9)]. Of the images recalled, participants in MOD and HIGH recalled a greater percentage of images (45.5% and 45.1%, respectively) than REST and LOW (24.3% and 17.0%, respectively) that were rated less pleasurable (p<0.05). There was also a tendency for participants in the HIGH group to recall a greater percentage of images rated as arousing. CONCLUSIONS: An acute exercise bout of sufficient intensity can improve memory consolidation, particularly of information rated less pleasurable and arousing. However, more information is needed to determine the mechanisms behind this exercise-induced response.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 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 source (direct Gemma or distilled Codex), 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".