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Endurance training and testosterone levels.

A C Hackney1

  • 1Department of Physical Education, University of North Carolina, Chapel Hill.

Sports Medicine (Auckland, N.Z.)
|August 1, 1989
PubMed
Summary
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Endurance training may lower testosterone in male athletes, potentially affecting the reproductive system. However, current research shows no consistent disruption of testosterone-dependent functions in these athletes.

Area of Science:

  • Exercise physiology
  • Reproductive endocrinology

Background:

  • Chronic endurance training can disrupt human reproductive and endocrinological systems.
  • Research has historically focused on female athletes, but recent studies highlight impacts on the male reproductive system.

Purpose of the Study:

  • To investigate the effects of endurance training on the male reproductive system, specifically focusing on testosterone levels.
  • To explore potential mechanisms, including hypothalamic-pituitary-testicular axis function, underlying observed changes.

Main Methods:

  • Review of existing research on endurance training and male reproductive hormones.
  • Analysis of studies examining resting testosterone levels, luteinizing hormone, and prolactin in endurance-trained males versus untrained controls.

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Main Results:

  • Endurance-trained males exhibit lower resting testosterone levels compared to untrained males.
  • Potential dysfunctions in the hypothalamic-pituitary-testicular axis are suggested by abnormalities in hormone levels and pituitary release.
  • No current evidence indicates consistent disruption of testosterone-dependent processes in endurance-trained males.

Conclusions:

  • Prolonged endurance training may lower testosterone in males, possibly through hypothalamic-pituitary-testicular axis alterations.
  • Despite hormonal changes, current data do not support significant dysfunctions in testosterone-dependent processes in endurance-trained males.