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Exercise-induced hyperthermia and hormonal responses to exercise

M W Radomski1, M Cross, A Buguet

  • 1Defence and Civil Institute of Environmental Medicine, North York, ON, Canada. manny.radomski@dciem.dnd.ca

Canadian Journal of Physiology and Pharmacology
|December 5, 1998
PubMed
Summary

Exercise-induced hyperthermia, or elevated body temperature, significantly impacts hormone release during physical activity. A thermal threshold of approximately 38°C appears to trigger hormonal and leukocytic responses during exercise.

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Area of Science:

  • Exercise Physiology
  • Endocrinology
  • Thermoregulation

Background:

  • Hormonal changes during exercise are influenced by various factors like intensity, duration, and fitness.
  • The role of exercise-induced hyperthermia in hormonal release remains less understood.
  • This study investigates the direct impact of elevated body temperature on hormone secretion during exercise.

Purpose of the Study:

  • To define the role of changes in body temperature in hormone release during exercise.
  • To identify a potential thermal threshold for hormonal and leukocytic responses.
  • To elucidate the relationship between core temperature and plasma hormone concentrations.

Main Methods:

  • Experiments involved severe exercise in controlled environmental conditions (23°C, varying wind speed) to manage core temperature increases.

Related Experiment Videos

  • Thermal clamping techniques (cold and warm water immersion) were used during endurance exercise.
  • Plasma concentrations of growth hormone, prolactin, and catecholamines were measured, alongside leukocyte responses.

    • Main Results:

    • Significant exponential relationships were observed between increased core temperature and plasma concentrations of growth hormone, prolactin, and catecholamines.
    • A thermal threshold of approximately 38°C was identified for the onset of hormonal and leukocytic responses.
    • Thermal clamping significantly attenuated both hormonal and leukocytic responses to exercise.

    Conclusions:

    • Exercise-induced hyperthermia plays a crucial role in modulating hormonal and leukocytic responses during physical activity.
    • Core body temperature increases are integrated into the control system governing these physiological responses to exercise.
    • A distinct thermal threshold exists, influencing the magnitude of hormonal release during exercise.