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Temperature regulation during exercise: old concepts, new ideas.

C V Gisolfi, C B Wenger

    Exercise and Sport Sciences Reviews
    |January 1, 1984
    PubMed
    Summary
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    The body

    Area of Science:

    • Physiology
    • Thermoregulation
    • Exercise Physiology

    Background:

    • Exercise impacts thermoregulation through heat production and other mechanisms like reduced central venous pressure and increased plasma osmolality.
    • Secondary effects of exercise-induced physiological changes can influence core body temperature during prolonged exertion or heat exposure.

    Purpose of the Study:

    • To investigate the concept of a shifting set point in the human temperature regulatory system during exercise.
    • To differentiate between set point shifts and alterations in effector response thresholds.

    Main Methods:

    • Analysis of interactions between thermal and nonthermal controls of effector responses during exercise.
    • Evaluation of how body state changes feedback to central control systems.

    Related Experiment Videos

  • Examination of effector response thresholds under various conditions.

    • Main Results:

    • The temperature regulatory system operates with a single, unchanging set point during exercise.
    • Exercise does not shift the set point; instead, it modifies the thermoregulatory command signal (Tsk).
    • Set point shifts, unlike exercise-induced changes, occur uniformly across all heat-dissipating responses (e.g., time of day, heat acclimation, fever).

    Conclusions:

    • The concept of a 'shifting set point' during exercise is inaccurate; the set point remains constant.
    • Changes observed during exercise are due to alterations in the thermoregulatory command signal, not a set point reset.
    • Uniform shifts in effector thresholds, indicative of a true set point change, are observed in conditions like fever and heat acclimation, but not typically during exercise.