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Journal of Endocrinological Investigation

, Volume 35, Issue 11, pp 947–950 | Cite as

Testosterone responses to intensive interval versus steady-state endurance exercise

  • A. C. Hackney
  • K. P. Hosick
  • A. Myer
  • D. A. Rubin
  • C. L. Battaglini
Rapid Communication

Abstract

Free testosterone (FT) hormonal responses were compared between high-intensity interval exercise (IE) and steady-state endurance exercise (SSE) in endurance trained males (no.=15). IE session was repeated periods of 90-sec treadmill running at 100–110% maximal oxygen uptake (VO2max) and 90-sec active recovery at 40% VO2max for 42–47 min. The SSE session consisted of a continuous 45-min run at 60–65% VO2max. Total work output was equal for each exercise session. A 45-min supine rest control session (CON) was also performed. All three sessions were on separate days. Pre-session (PRE), immediate post-session (POST), and 12-h post-session (12POST) blood samples were collected and used to determine FT, SHBG, LH, 3-α-androstanediol glucuronide (3-α Diol G) and cortisol. Analysis of variance compared IE and SSE biomarker responses to the reference CON session. IE and SSE each caused an increase (p<0.01) in FT, but IE more so than SSE (p<0.05). The 5α-reduc-tase marker 3-α Diol G response at 12POST IE was elevated while FT was reduced (p<0.05); no such change occurred following SSE. These findings suggest IE might produce a more pronounced turnover of FT by androgen sensitive tissue than the SSE form of exercise.

Key-words

Exercise endocrinology HIT hormones overtraining stress 

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Copyright information

© Italian Society of Endocrinology (SIE) 2012

Authors and Affiliations

  • A. C. Hackney
    • 1
  • K. P. Hosick
    • 1
  • A. Myer
    • 1
  • D. A. Rubin
    • 2
  • C. L. Battaglini
    • 1
  1. 1.Department of Exercise & Sport ScienceUniversity of North CarolinaChapel HillUSA
  2. 2.Department of KinesiologyCalifornia State University FullertonFullertonUSA

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