Inter-individual differences in working memory improvement after acute mild and moderate aerobic exercise

Area of Science:

• Neuroscience
• Exercise Physiology
• Cognitive Psychology

Background:

• Aerobic exercise is known to benefit cognitive function and brain health.
• Moderate-intensity exercise is particularly effective for cognitive performance.
• The impact of acute exercise on working memory (WM) remains unclear, with potential inter-individual variability.

Purpose of the Study:

• To investigate the effects of acute mild and moderate aerobic exercise on working memory (WM).
• To determine if inter-individual differences influence WM improvements after exercise.
• To explore the relationship between baseline WM and post-exercise WM changes.

Main Methods:

• Thirty healthy subjects underwent three conditions: control, mild-intensity exercise, and moderate-intensity exercise.
• A 10-minute cycling exercise session at 60 rpm with individualized load was performed.
• Working memory was assessed using the N-back task before, and at 5 and 15 minutes after exercise.

Main Results:

• Acute mild or moderate aerobic exercise did not significantly improve overall working memory function.
• Baseline working memory function was a significant predictor of post-exercise WM changes, irrespective of exercise intensity.
• Individuals with lower baseline working memory demonstrated the most substantial improvements.

Conclusions:

• Improvements in working memory following a single bout of aerobic exercise are dependent on an individual's baseline working memory capacity.
• Aerobic exercise may benefit those with lower working memory, highlighting the importance of individual differences.