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Chronobiological effects on exercise performance and selected physiological responses

M R Deschenes1, J V Sharma, K T Brittingham

  • 1Department of Kinesiology, The College of William and Mary, Williamsburg, VA 23187, USA.

European Journal of Applied Physiology and Occupational Physiology
|April 16, 1998
PubMed
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Aerobic exercise performance remains consistent throughout the day, unaffected by circadian rhythms. However, some physiological responses to exercise, like plasma lactate and norepinephrine, show significant time-of-day variations.

Area of Science:

  • Exercise Physiology
  • Chronobiology
  • Sports Science

Background:

  • Circadian rhythms influence physiological functions, but their impact on exercise performance is debated.
  • Previous research on time-of-day effects during exercise has produced inconsistent findings.
  • Understanding these variations is crucial for optimizing training and performance.

Purpose of the Study:

  • To investigate the influence of circadian rhythms on maximal aerobic exercise performance.
  • To examine physiological and psychophysiological responses to exercise at different times of day.
  • To determine if exercise responses differ based on the time of day.

Main Methods:

  • Ten physically fit, untrained male university students participated.
  • Maximal aerobic exercise tests were conducted at four intervals: 0800, 1200, 1600, and 2000 hours.

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  • Measurements included oxygen uptake, ventilation, heart rate, perceived exertion, rectal temperature, blood pressure, respiratory exchange ratio, plasma lactate, and norepinephrine.

    • Main Results:

    • Maximal aerobic exercise performance showed no significant time-of-day variation.
    • Oxygen uptake, ventilation, and heart rate were not affected by time of day.
    • Rectal temperature, respiratory exchange ratio, blood pressure, plasma lactate, and norepinephrine exhibited significant time-of-day influences.

    Conclusions:

    • Aerobic exercise performance is not influenced by circadian rhythms during typical exercise times.
    • While some physiological markers (e.g., lactate, norepinephrine) fluctuate with time of day, performance remains stable.
    • These findings suggest that exercise timing may not be critical for performance outcomes in this context.