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Related Experiment Videos

Temperature and sweating responses in one-legged and two-legged exercise.

B Bothorel1, G Dewasmes, A Hoeft

  • 1Laboratoire de Physiologie et de Psychologie Environnementales, CNRS/INRS, Strasbourg, France.

European Journal of Applied Physiology and Occupational Physiology
|January 1, 1991
PubMed
Summary

Local skin temperature did not significantly affect local sweat rates during one-legged or two-legged cycling exercise. Exercise intensity was the primary driver of sweating, overriding local thermal cues in a warm environment.

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Area of Science:

  • Exercise Physiology
  • Human Thermoregulation
  • Environmental Physiology

Background:

  • Understanding thermoregulatory responses during exercise is crucial for optimizing performance and safety.
  • Local skin temperature (Tsk,local) is a potential factor influencing local sweat rates (msw,local).
  • The interplay between exercise intensity, hydration status, and local thermal conditions on sweating requires further investigation.

Purpose of the Study:

  • To investigate the effect of local skin temperature on local sweat rates during one-legged (W1) and two-legged (W2) cycling exercise.
  • To determine if exercise intensity and hydration level modulate the relationship between local skin temperature and sweat rate.
  • To assess the influence of muscle activity (symmetrical vs. asymmetrical exercise) on local sweat production.

Main Methods:

Related Experiment Videos

  • Five subjects completed four 3-hour trials in a 36°C environment.
  • Exercise involved alternating 25-minute periods of W1 (45W) or W2 (90W) with 5-minute rest periods.
  • Local sweat rates were measured using sweat capsules with controlled local skin temperatures (37.0°C and 35.5°C) on the chest and thighs, under both dehydrated and rehydrated conditions.

Main Results:

  • Hydration status affected rectal temperature but not total or local sweat rates.
  • Local sweat rates were primarily influenced by exercise intensity, with higher rates at 90W compared to 45W.
  • No significant effect of local skin temperature on local sweat rates was observed across various conditions and locations.

Conclusions:

  • Local thermal effects on local sweat rates appear to be masked by a strong central drive for sweating during exercise in a warm environment.
  • Exercise intensity is a more dominant factor than local skin temperature in regulating sweat output under these conditions.
  • Asymmetrical exercise (one-legged vs. two-legged) did not show a specific effect on local sweat production in the resting versus working leg.