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Plasma testosterone during treadmill exercise

J E Wilkerson, S M Horvath, B Gutin

    Journal of Applied Physiology: Respiratory, Environmental and Exercise Physiology
    |August 1, 1980
    PubMed
    Summary
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    This study found that while plasma testosterone concentration increases with exercise intensity, total testosterone content remains unchanged due to concurrent plasma volume reduction. Unexpectedly, resting testosterone levels also rose before exercise as intensity increased.

    Area of Science:

    • Exercise Physiology
    • Endocrinology
    • Sports Science

    Background:

    • Testosterone plays a role in muscle adaptation and performance.
    • The relationship between exercise intensity and testosterone levels is complex.
    • Previous studies have shown varied responses of testosterone to exercise.

    Purpose of the Study:

    • To investigate the effect of varying exercise intensities on plasma testosterone concentration and content.
    • To examine the influence of plasma volume changes on testosterone measurements during exercise.
    • To explore anticipatory hormonal responses before exercise.

    Main Methods:

    • Five healthy male volunteers underwent graded submaximal exercise (30-90% VO2 max) and maximal aerobic capacity tests.
    • Peripheral venous blood samples were collected to measure plasma testosterone concentrations.

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  • Plasma volume changes were assessed concurrently with testosterone measurements.

    • Main Results:

    • Plasma testosterone concentration increased in proportion to exercise intensity.
    • This increase was offset by a similar decrease in plasma volume, leading to no net change in total testosterone content.
    • Resting pre-exercise testosterone concentration and content showed an anticipatory rise with increasing work intensity.

    Conclusions:

    • The observed increase in plasma testosterone during exercise is primarily an artifact of hemoconcentration, not an increase in total body testosterone.
    • Testosterone may not have a direct role in the acute physiological response to whole-body exercise.
    • Anticipatory hormonal regulation warrants further investigation in exercise settings.