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Intense exercise increases the post-exercise threshold for sweating

G P Kenny1, A A Chen, C E Johnston

  • 1University of Manitoba, Health, Leisure and Human Performance Research Institute, Winnipeg, Canada.

European Journal of Applied Physiology and Occupational Physiology
|January 1, 1997
PubMed
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Intense exercise temporarily lowers the sweating threshold during exertion but increases it afterward. This shift in thermoregulation helps the body manage core temperature following strenuous activity.

Area of Science:

  • Exercise Physiology
  • Thermoregulation
  • Human Physiology

Background:

  • Esophageal temperature (T(es)) remains elevated post-exercise, suggesting altered thermoregulatory thresholds.
  • Previous findings indicate elevated T(es) threshold for vasodilation after intense exercise.
  • The current study investigates if the sweating threshold is also affected post-exercise.

Purpose of the Study:

  • To test the hypothesis that the sweating threshold increases after intense exercise.
  • To quantify changes in the sweating threshold in response to exercise and recovery.

Main Methods:

  • Seven participants (4 males, 3 females) underwent water immersion (42°C) to determine baseline sweating onset.
  • Cycle ergometry (70% VO2max) was performed, followed by recovery.

Related Experiment Videos

  • Participants were re-immersed in hot water (42°C) to assess sweating threshold post-exercise.
  • A corrected core temperature calculation was used to account for varying skin temperatures.

    • Main Results:

    • The corrected core temperature at the onset of sweating was lower during exercise (36.7°C) compared to initial immersion (37.1°C).
    • The sweating threshold during the post-exercise immersion (37.3°C) was significantly higher than during exercise and initial immersion.
    • This indicates a decreased sweating threshold during exercise and an increased threshold during recovery.

    Conclusions:

    • Intense exercise initially decreases the sweating threshold.
    • A short-term increase in the resting sweating threshold occurs following intense exercise.
    • These findings highlight dynamic adjustments in thermoregulation during and after exercise.