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Endocrine response to intense interval exercise

A B Gray1, R D Telford, M J Weidemann

  • 1Division of Biochemistry and Molecular Biology, School of Life Sciences, Faculty of Science, Australian National University, Canberra A.C.T.

European Journal of Applied Physiology and Occupational Physiology
|January 1, 1993
PubMed
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Intense interval exercise significantly boosts sex hormone binding globulin (SHBG) and key hormones like beta-estradiol, testosterone, prolactin, and growth hormone in trained athletes. These hormonal shifts may explain physiological changes post-exercise.

Area of Science:

  • Exercise Physiology
  • Endocrinology
  • Sports Science

Background:

  • Interval exercise training is a common method for improving athletic performance.
  • Hormonal responses to exercise are complex and influence physiological adaptations.
  • The specific impact of intense interval exercise on sex hormone binding globulin (SHBG) and related hormones requires further elucidation.

Purpose of the Study:

  • To investigate the physiological changes during and after interval exercise training.
  • To assess the role of interval exercise in modulating plasma concentrations of SHBG, beta-estradiol, testosterone, prolactin, and growth hormone.

Main Methods:

  • Eight trained male athletes with high maximal oxygen uptake (VO2max) participated.
  • Subjects underwent an intense, exhaustive interval running protocol on a treadmill.

Related Experiment Videos

  • Plasma hormone concentrations were measured immediately post-exercise.

    • Main Results:

    • A significant increase in plasma SHBG concentration was observed post-exercise (P < 0.01).
    • Plasma concentrations of beta-estradiol (45%), testosterone (38%), prolactin (230%), and growth hormone (2000%) significantly increased (P < 0.01).

    Conclusions:

    • Intense interval exercise elicits substantial acute increases in SHBG and several key hormones.
    • These hormonal changes may mediate some of the physiological adaptations associated with intense exercise training.
    • Further research can explore the long-term implications of these hormonal responses.