Scientists discover a previously unknown cognitive benefit of aerobic exercise
Scientists have found that a brief session of moderate cycling protects the brain's automatic recalibration process. The study highlights how acute exercise helps the nervous system maintain its ability to adjust movements without conscious effort.
A recent study published in Physiology & Behavior discovered a previously unknown cognitive benefit of moderate aerobic exercise. The research, led by Zivar Beyraghi at Université de Sherbrooke, suggests that a 20-minute session of stationary cycling prevents a natural decline in unconscious motor learning that typically occurs after a period of rest.
The study involved 26 healthy young adults, with 15 females and an average age of 25 years. The participants underwent a within-participant design, completing both the active condition (20-minute cycling) and resting condition on separate days. During testing, participants used a robotic apparatus to track arm movements while aiming for a target on a screen.
The research team manipulated visual feedback by randomly rotating the cursor's path 30 degrees clockwise or counter-clockwise. Participants were instructed to ignore these disturbances and aim directly for the target. This allowed researchers to measure implicit adaptation through the post-rotation bias, an involuntary hand drift in the opposite direction of the cursor's rotation.
The findings show that before and after the resting condition, participants exhibited a natural decrease in unconscious motor learning, with the brain's sensorimotor adaptation process slowing down by 2.93 degrees on average. However, after the 20-minute moderate-intensity cycling session, this adaptation bias remained stable at 2.40 degrees. This suggests that the physical activity preserved the brain's ability to automatically learn and adjust to sensory errors.
The study highlights that aerobic exercise improves general motor learning, particularly the unconscious component, by maintaining and potentially enhancing the brain's ability to recalibrate physical movements. The exact mechanisms behind this preserved implicit learning remain unclear, but the findings provide evidence that short bouts of moderate exercise can have lasting cognitive benefits.
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