Endocrine response to intense interval exercise

  • A. B. Gray
  • R. D. Telford
  • M. J. Weidemann


This investigation provides an insight into the physiological changes produced, and processes operating, during and after a typical interval exercise training regime. The role of interval exercise in the modulation of the plasma concentration of sex hormone binding globulin (SHBG) and the hormones β-oestradiol, testosterone, prolactin and growth hormone was assessed. Eight trained male athletes [mean maximal oxygen uptake (\(\dot V\)O2max 64.3 (SD 3.8) ml·kg−1·min−1, mean age 31.5 (SD 4.5) years] undertook an intense interval exercise (treadmill running) protocol to exhaustion. Subjects completed an average of 15.6×1-min runs. This interval protocol produced significant increase in the plasma concentration of SHBG and all four hormones (all P<0.01) in the immediate post-test period. The plasma concentration of the hormones increased as indicated: β-oestradiol (45%), testosterone (38%), prolactin (230%), growth hormone (2000%). These hormones have an established capacity to interact with components of many physiological systems and, as such, may provide a mechanism for the changes induced by intense exercise in many of these systems.

Key words

Anaerobic Growth hormone Oestradiol Testosterone Prolactin Sex hormone binding globulin 


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Copyright information

© Springer-Verlag 1993

Authors and Affiliations

  • A. B. Gray
    • 1
  • R. D. Telford
    • 2
  • M. J. Weidemann
    • 1
  1. 1.Division of Biochemistry and Molecular Biology, School of Life Sciences, Faculty of ScienceThe Australian National UniversityCanberraAustralia
  2. 2.Department of Physiology and Applied NutritionAustralian Institute of SportBelconnenAustralia

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