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Maximal aerobic exercise following prolonged sleep deprivation
J Goodman1, M Radomski, L Hart
1School of Physical & Health Education, University of Toronto, Ont.
International Journal of Sports Medicine
|December 1, 1989
Summary
Sixty hours of sleep deprivation did not affect maximal oxygen intake or endurance in young women. However, estimated plasma volume increased, suggesting physiological adaptations to prolonged wakefulness.
Area of Science:
- Exercise Physiology
- Sleep Deprivation Research
Background:
- Sleep deprivation is known to impact physiological functions.
- Previous studies indicated decreased maximal oxygen intake in men after sleep deprivation.
Purpose of the Study:
- To investigate the effect of 60 hours of sleep deprivation on maximal oxygen intake in young women.
- To assess changes in aerobic performance markers and estimated plasma volume.
Main Methods:
- 12 young women underwent a cycle ergometer test before and after 60 hours of sleep deprivation.
- Cognitive tasks were used to maintain subject arousal throughout the study.
- Maximal oxygen intake, endurance time, and other aerobic performance indicators were measured.
Main Results:
- No significant changes were observed in maximal oxygen intake or endurance time.
- Peak exercise ventilation, heart rate, respiratory exchange ratio, and blood lactate remained unchanged.
- Estimated plasma volume increased by 11.6%, with corresponding decreases in hematocrit and red cell count.
Conclusions:
- Sixty hours of sleep deprivation does not impair maximal oxygen intake or endurance in young women under conditions of maintained arousal and cycle ergometry.
- Physiological adaptations, including increased plasma volume, may compensate for sleep loss.
- Differences from previous treadmill-based studies in males suggest ergometer type and arousal levels are critical factors.