Testosterone responses to intensive interval versus steady-state endurance exercise
A.C. Hackney1, K.P. Hosick1, A. Myer1, D.A. Rubin2, and C.L. Battaglini1
1Department of Exercise & Sport Science, University of North Carolina, Chapel Hill, North Carolina; 2Department of Kinesiology, California State University Fullerton, Fullerton, California, USA

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-reductase 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. (J. Endocrinol. Invest. 35: 947-950, 2012) ©2012, Editrice Kurtis

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