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Human circadian rhythms and exercise.

T Reilly1

  • 1Centre for Sport and Exercise Sciences, School of Health Sciences, Liverpool Polytechnic, England.

Critical Reviews in Biomedical Engineering
|January 1, 1990
PubMed
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Circadian rhythms, or 24-hour biological cycles, significantly impact exercise performance, particularly neuromotor and cognitive functions. Understanding these rhythms is crucial for optimizing athletic training and competition schedules.

Area of Science:

  • Chronobiology
  • Exercise Physiology
  • Sports Science

Background:

  • Biological functions exhibit cyclical changes over 24 hours, known as circadian rhythms.
  • Key rhythms influencing exercise performance include body temperature and the sleep-wake cycle.
  • Performance can also be affected by ultradian rhythms, causing transient afternoon declines.

Purpose of the Study:

  • To explore the influence of circadian and ultradian rhythms on various components of exercise performance.
  • To identify factors determining optimal exercise timing.
  • To highlight the importance of recognizing endogenous rhythms for athletic practitioners.

Main Methods:

  • Review of existing literature on circadian rhythms and exercise performance.
  • Analysis of the relationship between body temperature, sleep-wake cycles, and performance metrics.

Related Experiment Videos

  • Consideration of environmental and individual factors influencing optimal exercise timing.

    • Main Results:

    • Exercise performance, especially neuromotor and cognitive aspects, is closely linked to the body temperature curve and sleep-wake cycle.
    • Optimal exercise timing is multifactorial, influenced by rhythmicity, exercise type, individual chronotype, and environment.
    • Environmental factors (light, heat, activity) and disruptions (shift work, jet lag) can desynchronize circadian rhythms.

    Conclusions:

    • Athletic practitioners, sports scientists, and organizers must acknowledge the impact of self-sustaining biological rhythms on performance.
    • Strategies to manage circadian desynchronosis, including behavioral and dietary adjustments, are important.
    • Sleep loss disproportionately affects cognitive function compared to gross motor skills.