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Elevations in core and muscle temperature impairs repeated sprint performance.

B Drust1, P Rasmussen, M Mohr

  • 1Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Liverpool, UK.

Acta Physiologica Scandinavica
|January 29, 2005
PubMed
Summary

Hyperthermia impairs repeated sprint performance despite elevated muscle temperatures. This reduction in power output may stem from central nervous system effects rather than metabolic fatigue.

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Area of Science:

  • Exercise Physiology
  • Environmental Physiology
  • Sports Science

Background:

  • Elevated muscle temperature is generally associated with enhanced physiological function.
  • Understanding the impact of hyperthermia on exercise performance is crucial for athletes and trainers.

Purpose of the Study:

  • To investigate the effects of hyperthermia on intermittent exercise and repeated sprint performance.
  • To determine if elevated core and muscle temperatures influence power output during repeated sprints.

Main Methods:

  • Seven male participants completed intermittent cycling followed by maximal sprints in both normal (20°C) and hot (40°C) environments.
  • Physiological responses including core and muscle temperatures, heart rate, and perceived exertion were monitored.

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Main Results:

  • Hyperthermia significantly elevated core and muscle temperatures, heart rate, and perceived exertion.
  • While initial sprint power was unaffected, mean power output during repeated sprints declined more in the heat.
  • Average mean power output across five sprints was lower in the hyperthermic condition.

Conclusions:

  • Hyperthermia reduced repeated sprint performance, contrary to expectations based on elevated muscle temperature.
  • The findings suggest that impaired performance may be linked to central nervous system factors rather than metabolic accumulation.
  • Further research is needed to elucidate the precise mechanisms by which high core temperature affects neuromuscular function.