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Core threshold temperatures for sweating.

I B Mekjavić1, J Bligh

  • 1School of Kinesiology, Simon Fraser University, Burnaby, B.C., Canada.

Canadian Journal of Physiology and Pharmacology
|September 1, 1989
PubMed
Summary
This summary is machine-generated.

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This study investigated how skin temperature (Tsk) affects the core temperature (Tc) threshold for sweating. Findings show that higher skin temperatures influence sweating onset and cessation more than core temperature changes alone.

Area of Science:

  • Human Physiology
  • Thermoregulation Research

Background:

  • Detecting shifts in core temperature (Tc) threshold for sweating requires stabilizing environmental and physiological variables.
  • Progressive changes in Tc are difficult to achieve without altering skin temperature (Tsk).

Purpose of the Study:

  • To compare two methods for determining the core threshold for sweating.
  • To assess the influence of skin temperature (Tsk) on the core temperature (Tc) threshold for sweating.

Main Methods:

  • Method 1: Body warming via 40°C water immersion, followed by cooling in 28°C water.
  • Method 2: Raising Tc via 20°C air cycling exercise, followed by cooling in 28°C water.
  • Monitoring esophageal temperature (Tes) and skin temperature (Tsk) during both procedures.

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Main Results:

  • Sweating onset occurred at a lower esophageal temperature (Tes) during 40°C water immersion (36.9°C) compared to exercise (37.4°C), attributed to higher Tsk.
  • The decline in sweat rate during 28°C water immersion showed similar time courses for both methods.
  • Sweating extinction was faster and occurred at a lower Tes following 40°C immersion, correlating with Tsk rather than Tes changes.

Conclusions:

  • Skin temperature (Tsk) significantly influences the core temperature (Tc) threshold for sweating onset and cessation.
  • The method of altering core temperature impacts the observed sweating thresholds, with water immersion methods showing a stronger Tsk effect.
  • Standardizing Tsk is crucial when investigating nonthermal influences on thermoregulatory sweating thresholds.