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Are All Heat Loads Created Equal?

Robert D Meade1, Glen P Kenny

  • 1Human and Environmental Physiology Research Unit, School of Human Kinetics, University of Ottawa, Montpetit Hall, Ottawa, CANADA.

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|April 29, 2017
PubMed
Summary
This summary is machine-generated.

Exercise at a fixed evaporative requirement for heat balance (Ereq) maintained similar heat loss and body temperature. However, varying metabolic and environmental heat loads altered core temperature, skin temperature, heart rate, and physiological strain index.

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Area of Science:

  • Exercise Physiology
  • Environmental Heat Stress
  • Thermoregulation

Background:

  • Maintaining thermal balance during exercise is crucial for performance and health.
  • Understanding how combined metabolic and environmental heat loads affect physiological responses is essential for preventing heat-related illnesses.
  • Evaporative heat loss is a primary mechanism for dissipating heat during exercise.

Purpose of the Study:

  • To evaluate physiological responses during exercise under conditions of a fixed evaporative requirement for heat balance (Ereq) but varying combinations of metabolic and environmental heat loads.
  • To determine how different heat loads influence core body temperature, skin temperature, heart rate, and physiological strain index.
  • To investigate the interplay between metabolic heat production and ambient temperature in regulating thermoregulation during prolonged exercise.

Main Methods:

  • Nine healthy males performed 75-min semirecumbent cycling sessions at four different conditions combining metabolic heat production and ambient temperature.
  • Whole-body heat production and dry heat loss were measured using indirect and direct calorimetry, respectively.
  • Esophageal temperature (Tes), mean skin temperature (Tsk), heart rate (HR), and mean body temperature (Tb) were continuously monitored, and Physiological Strain Index (PSI) was calculated.

Main Results:

  • End-exercise evaporative heat loss and mean body temperature (Tb) were similar across all conditions (P ≥ 0.48).
  • Esophageal temperature (Tes) was higher in conditions with higher metabolic heat production (440 W [30°C] and 388 W [35°C]) compared to lower metabolic heat production conditions (317 W [40°C] and 258 W [45°C]; P ≤ 0.05).
  • Mean skin temperature (Tsk), heart rate (HR), and Physiological Strain Index (PSI) showed significant differences between conditions, indicating varying physiological strain depending on the heat load combination.

Conclusions:

  • Exercise at a fixed evaporative requirement for heat balance (Ereq) effectively equalizes evaporative heat loss and mean body temperature.
  • Despite similar overall heat balance, the distribution of heat load (metabolic vs. environmental) significantly impacts esophageal temperature, skin temperature, heart rate, and physiological strain.
  • These findings highlight the importance of considering the combined effects of metabolic and environmental heat stress for accurate assessment of physiological strain during exercise in the heat.