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Elevation in set point for body temperature regulation after prolonged exercise.

J S Haight, W R Keatinge

    The Journal of Physiology
    |February 1, 1973
    PubMed
    Summary

    Prolonged exercise elevated resting deep body temperature in healthy men by 0.36°C. This post-exercise hyperthermia, potentially due to minor tissue damage, persisted for 11 hours and affected sweating thresholds.

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    Area of Science:

    • Exercise Physiology
    • Human Thermoregulation

    Background:

    • Prolonged exercise can significantly impact physiological parameters.
    • Understanding post-exercise body temperature regulation is crucial for athlete health and performance.

    Purpose of the Study:

    • To investigate the effects of prolonged exercise on resting deep body temperature in healthy men.
    • To determine the duration and characteristics of post-exercise body temperature elevation.
    • To assess the influence of elevated body temperature on thermoregulatory responses.

    Main Methods:

    • Nine healthy men underwent prolonged exercise (37 km walk, 2.5 km ascent/descent over 9 hours).
    • Deep body temperature (oral and rectal) was monitored at rest before and after exercise.
    • Thermoregulatory responses, including sweating thresholds and metabolic response to cold, were assessed.

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    Main Results:

    • Resting deep body temperature increased by approximately 0.36°C after prolonged exercise.
    • This temperature elevation persisted for about 11 hours post-exercise, regardless of ambient temperature.
    • The body temperature threshold for sweating initiation also increased, while metabolic response to cold remained normal or elevated.

    Conclusions:

    • Prolonged exercise induces a sustained elevation in resting deep body temperature (post-exercise hyperthermia).
    • This phenomenon is likely caused by mild pyrexia resulting from endogenous pyrogen release due to minor tissue damage.
    • The findings suggest significant alterations in thermoregulation following strenuous physical activity.