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Double-barreled and Concentric Microelectrodes for Measurement of Extracellular Ion Signals in Brain Tissue
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Heat acclimation causes a linear decrease in sweat sodium ion concentration.

Michael J Buono1, Mark Kolding2, Eric Leslie2

  • 1School of Exercise and Nutritional Sciences, San Diego State University, San Diego, CA 92182, USA; The Department of Biology, San Diego State University, San Diego, CA 92182, USA.

Journal of Thermal Biology
|January 6, 2018
PubMed
Summary
This summary is machine-generated.

Heat acclimation rapidly reduces sweat sodium concentration. This adaptation occurs quickly, within two days, enhancing the body's ability to conserve electrolytes during exercise in the heat.

Keywords:
Eccrine glandHeat acclimationSweat sodium ion concentrationThermoregulation

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Area of Science:

  • Exercise Physiology
  • Environmental Physiology
  • Human Adaptation

Background:

  • Heat acclimation is known to reduce sweat sodium concentration.
  • The precise time course for this reduction is not fully understood.

Purpose of the Study:

  • To determine the time course of sweat sodium ion concentration reduction during heat acclimation.
  • To investigate the relationship between sweat rate and sweat sodium ion concentration over 7 days of heat exposure.

Main Methods:

  • Four healthy volunteers underwent 7 days of heat acclimation (2h daily treadmill walking at 40°C, 40% RH).
  • A modified constant hyperthermia protocol maintained core temperature.
  • Forearm sweat was collected on days 1, 3, 5, and 7 to measure sweat rate and sodium ion concentration.

Main Results:

  • A significant downward shift in the sweat rate vs. sweat sodium ion concentration relationship was observed on days 3, 5, and 7 compared to day 1.
  • Heat acclimation significantly lowered sweat sodium ion concentration at any given sweat rate.
  • This adaptation was rapid, evident after just two days of heat exposure.

Conclusions:

  • Heat acclimation rapidly improves sodium ion reabsorption in the eccrine sweat gland duct.
  • Significant reductions in sweat sodium ion concentration indicate enhanced electrolyte conservation.
  • The findings suggest a quick physiological response to heat exposure for improved thermoregulation.