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Phase-advance shifts of human circadian pacemaker are accelerated by daytime physical exercise
Daytime exercise speeds up shifts in the human internal body clock
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Abstract
Plasma melatonin rhythm was significantly phase advanced with physical exercise during a 15-day forced sleep-wake schedule.
- The study involved subjects adhering to a forced sleep-wake schedule of 23 hours and 40 minutes over 12 cycles.
- Physical exercise was imposed twice per waking period for 2 hours each, using bicycle- or rowing-type ergometers.
- After 6 days of exercise, a significant phase advancement in melatonin rhythm was observed.
- The amplitude of the melatonin rhythm remained unchanged regardless of exercise.
- Exercise in the afternoon or at midnight caused a significant phase delay in melatonin rhythms compared to the prepulse phase.
- Phase shifts from exercise were not different from those observed in sedentary controls.
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