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Mental fatigue impairs physical performance in humans.
Samuele M Marcora1, Walter Staiano, Victoria Manning
1School of Sport, Health and Exercise Sciences, Bangor University, Bangor, Wales, United Kingdom. s.m.marcora@bangor.ac.uk
Journal of Applied Physiology (Bethesda, Md. : 1985)
|January 10, 2009
Summary
Mental fatigue, a state from demanding cognitive tasks, significantly reduces physical performance. This occurs because mental fatigue increases perceived exertion, not due to physiological changes.
Area of Science:
- Sports Science
- Neuroscience
- Psychology
Background:
- Mental fatigue is a state resulting from prolonged cognitive exertion.
- Its impact on cognitive and skilled performance is established, but effects on physical performance are less understood.
Purpose of the Study:
- To investigate the impact of mental fatigue on physical exercise tolerance.
- To determine the underlying mechanisms, differentiating between physiological and perceptual factors.
Main Methods:
- A randomized crossover study involving 16 participants.
- Participants underwent either a demanding cognitive task or a control condition before cycling to exhaustion.
- Physiological responses, mood, motivation, and perceived exertion were measured.
Main Results:
- Mental fatigue significantly reduced time to exhaustion (P = 0.003).
- This reduction was not explained by cardiorespiratory or musculoenergetic factors.
- Mentally fatigued participants reported significantly higher perception of effort (P = 0.007).
Conclusions:
- Mental fatigue limits exercise tolerance primarily through increased perception of effort.
- Cardiorespiratory and musculoenergetic factors are not the main mediators.
- Further research should explore shared neurocognitive resources between mental and physical activities.
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