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Effect of exercise intensity on the postexercise sweating threshold.

Glen P Kenny1, Julien Periard, W Shane Journeay

  • 1Human Performance and Environmental Physiology Research Laboratory, School of Human Kinetics, Faculty of Health Sciences, University of Ottawa, Ottawa, Ontario, Canada K1N 6N5. gkenny@uottawa.ca

Journal of Applied Physiology (Bethesda, Md. : 1985)
|August 26, 2003
PubMed
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Higher exercise intensity increases the threshold for sweating post-exercise. This sweating response is influenced by exercise intensity and potential nonthermal baroreceptor reflex adjustments.

Area of Science:

  • Exercise Physiology
  • Thermoregulation
  • Human Physiology

Background:

  • The body's sweating response is crucial for thermoregulation.
  • Exercise intensity can influence physiological responses during and after physical activity.
  • Understanding post-exercise physiological adjustments is important for recovery and performance.

Purpose of the Study:

  • To test the hypothesis that higher exercise intensity elevates the post-exercise sweating onset threshold.
  • To investigate the relationship between exercise intensity, core temperature, and sweat response.
  • To explore potential mechanisms, such as post-exercise hypotension, influencing thermoregulation.

Main Methods:

  • Eight subjects underwent resting and exercise (55%, 70%, 85% peak oxygen consumption) conditions.

Related Experiment Videos

  • Core temperature was monitored via esophageal temperature.
  • Sweat rate was measured using a ventilated capsule; skin temperature was controlled with a liquid-conditioned suit.

    • Main Results:

    • Exercise intensity significantly increased the sweating onset threshold (0.11-0.33°C above resting values).
    • Higher exercise intensities led to greater post-exercise hypotension.
    • A correlation between increased exercise intensity and elevated sweating threshold was observed.

    Conclusions:

    • Post-exercise sweating response is significantly modified by exercise intensity.
    • Nonthermal baroreceptor reflex adjustments post-exercise may influence sweating thresholds.
    • Exercise intensity plays a key role in modulating the body's thermoregulatory recovery.