Journal
JOURNAL OF SPORTS SCIENCES
Volume 39, Issue 2, Pages 183-191Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/02640414.2020.1809976
Keywords
Cognition; dehydration; high-intensity exercise; exercise duration; distributional analysis; expectancy effects
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The study found that moderate-intensity and longer duration aerobic exercise may have a better effect on cognition, and continuing activity may not impair cognition.
The cognitive effects of acute aerobic exercise were investigated in endurance-trained individuals. On two occasions, 21 cyclists; 11 male (VO2max: 57 +/- 9 mL center dot kg(-1)center dot min(-1)) and 10 female (VO2max: 51 +/- 9 mL center dot kg(-1)center dot min(-1)), completed 45 min of fixed, moderate-intensity (discontinuous) cycling followed by an incremental ride to exhaustion. Cognitive function was assessed at Baseline, after 15 and 45 min of exercise (15EX and 45EX) and at Exhaustion using a 4-Choice Reaction Time (CRT) test and the Stroop test (Incongruent and Congruent Reaction Time [RT]). A sham capsule was administered on one occasion to determine whether the cognitive response to exercise was robust to the influence of a placebo. CRT, Congruent RT and Incongruent RT decreased (improved) at 15EX, 45EX and Exhaustion compared to Baseline (p's<0.005). While CRT and Congruent RT were faster at 45EX than 15EX (p's<0.020), Incongruent RT was not (p= 1.000). The sham treatment did not affect cognition. When performed at a moderate-intensity, longer duration exercise (up to 45 min) may improve cognition to a greater extent than shorter duration exercise; however, the magnitude of improvement appears to decrease with increasing task complexity. HI/EE performed following a sustained bout of dehydrating activity may not impair cognition.
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