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Circadian rhythms have no effect on cycling performance

B Dalton1, L McNaughton, B Davoren

  • 1Centre for Human Movement Studies, University of Tasmania, Launceston, Australia.

International Journal of Sports Medicine
|December 31, 1997
PubMed
Summary

Circadian rhythms, or the body's natural 24-hour cycle, do not significantly impact 15-minute time trial cycling performance in trained athletes. While core body temperature shows daily variations, athletic performance remains consistent across different testing times.

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Area of Science:

  • Sports Science
  • Exercise Physiology
  • Chronobiology

Background:

  • Circadian rhythms influence physiological processes and performance.
  • Understanding the impact of daily biological rhythms on athletic performance is crucial for training optimization.

Purpose of the Study:

  • To investigate the effect of circadian rhythms on 15-minute time trial cycling performance.
  • To determine if time of day influences maximal power output and physiological responses during cycling.

Main Methods:

  • Seven trained male cyclists/triathletes completed three 15-minute maximal cycling performance tests at different times of day (morning, afternoon, evening).
  • Physiological measures included oxygen consumption (VO2max), heart rate, blood lactate, and resting oral temperature.
  • Rate of Perceived Exertion (RPE) was recorded using the Borg scale.

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Main Results:

  • Resting oral temperature showed a significant diurnal variation, being highest in the afternoon.
  • Total work and average power output were highest in the morning and lowest in the afternoon, but these differences were not statistically significant.
  • No significant effect of time of day was observed on 15-minute cycling performance metrics.

Conclusions:

  • Circadian rhythms do not appear to significantly affect 15-minute time trial cycling performance in trained athletes.
  • The human body demonstrates an adaptive response to training at various times, potentially overriding inherent biological rhythms.
  • While training compatibility with the body clock may offer benefits, performance adaptability is a key factor.