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Thermoregulatory function during the marathon.

Robert W Kenefick1, Samuel N Cheuvront, Michael N Sawka

  • 1Thermal and Mountain Medicine Division, Army Research Institute of Environmental Medicine, Natick, Massachusetts 01760, USA. Robert.Kenefick@us.army.mil

Sports Medicine (Auckland, N.Z.)
|May 1, 2007
PubMed
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Marathon running challenges the human thermoregulatory system, with hyperthermia a risk in warm weather and hypothermia in cold. Core body temperature during exercise is mainly influenced by metabolic rate, not environment.

Area of Science:

  • Exercise physiology
  • Environmental physiology
  • Human thermoregulation

Background:

  • Marathon running occurs across diverse environmental conditions, posing risks of hyperthermia and hypothermia.
  • Body temperature regulation during marathons involves balancing metabolic heat production with environmental exchange, governed by the heat balance equation.

Purpose of the Study:

  • To analyze the impact of environmental conditions on marathon runners' thermoregulation.
  • To understand the physiological challenges posed by heat and cold during endurance events.

Main Methods:

  • Analysis of the heat balance equation in the context of marathon running.
  • Review of physiological responses to varying environmental conditions during exercise.

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Main Results:

  • Core body temperature during exercise is primarily determined by metabolic rate, showing relative independence from environmental factors.
  • Cooler conditions facilitate heat loss via radiation and convection, potentially allowing higher core temperatures.
  • Warmer environments increase skin temperature, sweating, and skin blood flow, intensifying thermoregulatory and circulatory strain.

Conclusions:

  • Marathon running presents significant thermoregulatory challenges due to the interplay between exercise intensity and environmental conditions.
  • Understanding these challenges is crucial for optimizing performance and safety in endurance events.