Mental Fatigue Impairs Physical Performance: How Cognitive Work Affects Workouts
By
GoodluckH
The kind of bagel that ruins lesser bagels for you.
Summary
The article debunks the common belief that intense thinking burns significant calories, explaining that while the brain uses 20% of the body's energy at rest, intense cognitive work adds minimal additional energy expenditure. However, the article reveals that mental fatigue from prolonged cognitive work significantly impairs physical performance in subsequent workouts, affecting endurance, motivation, and perceived exertion. The author explores the physiological and psychological mechanisms behind this phenomenon, including glucose depletion, stress hormone release, and central nervous system fatigue, offering practical strategies to mitigate these effects.
Key quotes
· 5 pulledYour brain is expensive, but thinking is cheap
The mental byproducts of a long cognitive day quietly sabotage your endurance in ways no amount of willpower can fix
Intense thinking barely adds to that
By evening, I'd feel utterly drained. Surely all that thinking was metabolically expensive
The first part was humbling. The second part was alarming
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