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Sleep Deprivation and Exercise Tolerance.
Final rept. 1 Feb 81-31 Jan 86,
INDIANA UNIV FOUNDATION INDIANAPOLIS RESEARCH AND SPONSORED PROGRAMS
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Acute sleep deprivation radically alters mood and sleepiness. It blunts, as well, the ability to perform long-term maximal exercise. These effects are more evident after 50 than after 25 hours without sleep. Sleeplessness does not, however, change any measured physiological responses to exercise. Stress hormone levels, that is beta-endorphin and cortisol, are the same during exercise with or without prior sleep. Similarly, exercise heart rate, ventilation, and blood pressure, and blood lactate levels, are identical under the two conditions. We conclude that sleep loss hampers physical performance primarily through psychological mechanisms.
APPROVED FOR PUBLIC RELEASE