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Progesterone-induced changes in exercise performance and ventilatory response.

H W Bonekat, M L Dombovy, B A Staats

    Medicine and Science in Sports and Exercise
    |April 1, 1987
    PubMed
    Summary
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    Medroxyprogesterone acetate (MPA) increased resting ventilatory response to carbon dioxide in males, mimicking menstrual cycle changes. This enhanced response did not negatively impact exercise performance or maximal oxygen uptake.

    Area of Science:

    • Exercise Physiology
    • Respiratory Physiology
    • Endocrinology

    Background:

    • Progesterone influences ventilatory response (VR) during the luteal phase of the menstrual cycle.
    • Understanding the specific role of progesterone in VR and exercise performance is crucial.

    Purpose of the Study:

    • To investigate the effects of medroxyprogesterone acetate (MPA), a progesterone analog, on ventilatory response and exercise performance in males.
    • To compare MPA-induced changes in males with known effects in females during the menstrual cycle.

    Main Methods:

    • 10 healthy males received MPA (20 mg TID for 5 doses).
    • Resting and exercise ventilatory responses to hypercapnia and hypoxia were measured.
    • Arterial blood gases and exercise performance metrics (duration, oxygen uptake) were assessed.

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    Main Results:

    • MPA increased resting VR to hypercapnia but not hypoxia, inducing respiratory alkalosis.
    • During exercise, ventilation relative to CO2 output increased, indicating heightened VR to endogenous CO2.
    • Ventilation relative to oxygen uptake or workload showed minimal increase.
    • Maximal exercise duration and maximal oxygen uptake remained unchanged.
    • MPA induced ventilatory changes similar to those observed in the luteal phase of the menstrual cycle in females.

    Conclusions:

    • MPA administration in males replicates key ventilatory changes seen in the female luteal phase.
    • Increased ventilatory response to CO2, induced by MPA, does not impair exercise performance.
    • Progesterone plays a significant role in modulating ventilatory control during exercise.