The effects of acute exercise on cognitive performance: a meta-analysis.
Level 1 - systematic review of randomized trials
Meta-analysis of 79 studies on acute exercise and cognitive performance
PubMed 22480735 · doi:10.1016/j.brainres.2012.02.068
What was done
The authors searched electronic databases and reference lists to evaluate the effects of a single session of exercise on cognitive performance. A total of 79 studies met inclusion criteria. The meta-analysis analyzed overall cognitive effects, timing paradigms (during exercise, immediately post-exercise, and after a delay), and potential moderators including exercise duration, exercise intensity, cognitive task type, and participant fitness.
What was found
The overall effect of acute exercise on cognitive performance was positive and small (g = 0.097, n = 1034). Positive and small effects occurred across all three timing paradigms: during exercise (g = 0.101; 95% CI: 0.041 to 0.160), immediately following exercise (g = 0.108; 95% CI: 0.069 to 0.147), and after a delay (g = 0.103; 95% CI: 0.035 to 0.170). Exercise duration, exercise intensity, type of cognitive performance assessed, and participant fitness were identified as significant moderators.
Why it matters
This review establishes that while acute exercise reliably enhances cognitive performance, the general effect size across unselected conditions is very small. Meaningful gains likely depend on specific exercise intensities, durations, and targeted cognitive domains.
Limits
The overall effect magnitude is very small (g approximately 0.10). The abstract does not provide effect sizes for specific moderator subgroups, nor does it report the underlying study designs, participant demographics, or risk of bias in the included trials.