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Body temperature elevation, exercise and serum prolactin concentrations.

S E Christensen, O Jørgensen, J Møller

    Acta Endocrinologica
    |August 1, 1985
    PubMed
    Summary
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    Elevated body temperature stimulates prolactin (Prl) secretion in healthy males. Exercise-induced temperature increases did not affect Prl, suggesting exercise may inhibit this response.

    Area of Science:

    • Endocrinology
    • Exercise Physiology
    • Human Physiology

    Background:

    • Pituitary hormone release is influenced by various physiological stressors.
    • The specific roles of core body temperature elevation and exercise in regulating prolactin secretion remain incompletely understood.

    Purpose of the Study:

    • To investigate the independent effects of increased core body temperature and exercise on pituitary hormone release, specifically serum prolactin (Prl).

    Main Methods:

    • Ten healthy young males participated in four experimental conditions.
    • Continuous tympanic temperature monitoring was employed during all tests.
    • Serum prolactin levels were measured in response to controlled body temperature changes.

    Main Results:

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    • External heating at rest led to a significant increase in serum prolactin, with levels paralleling tympanic temperature changes.
    • Similar magnitude of core temperature elevation achieved through moderate-intensity exercise did not alter prolactin secretion.
    • A decrease in body temperature towards normal also correlated with changes in prolactin.

    Conclusions:

    • Increased core body temperature is a direct stimulus for prolactin secretion in humans.
    • Exercise appears to exert an inhibitory effect on the prolactin response to elevated body temperature.
    • These findings differentiate the endocrine responses to passive heating versus exercise-induced hyperthermia.