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Exercise Distributed across Day and Night Does Not Alter Circadian Period in Humans
Exercise at different times of day does not change the body’s internal clock in humans
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Abstract
No effect of exercise on endogenous circadian period was observed in 8 subjects over a 44-day study.
- Increased activity from running-wheel access in rodents is associated with a change in circadian period.
- Prior studies in humans have shown inconsistent results regarding exercise's effect on circadian period due to methodological issues.
- The current study utilized a 20-h forced desynchrony protocol under dim light to assess exercise's influence on circadian rhythm.
- Exercise involved three 45-minute sessions per wake period, targeting ~65% of maximal heart rate.
- Measurements included core body temperature and hourly plasma melatonin samples, both showing no change in circadian period.
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