Journal of biological rhythms

Exercise at different times of day does not change the body’s internal clock in humans

Circadian Biology Weekly Brief ↗PubMed ↗DOI ↗

Updated

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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