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J Appl Physiol (September 26, 2003). doi:10.1152/japplphysiol.00656.2003
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Submitted on June 25, 2003
Accepted on September 22, 2003

Effect of training status and exercise mode on endogenous steroid hormones in males

Mark S Tremblay1*, Jennifer L Copeland1, and Walter Van Helder2

1 College of Kinesiology, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
2 College of Osteopathic Medicine, Midwestern University, Arizona Campus, Arizona, USA

* To whom correspondence should be addressed. E-mail: mark.tremblay{at}usask.ca.

The purpose of this study was to determine the acute anabolic and catabolic hormone response to endurance and resistance exercise bouts of equal volume, in subjects with differing training status. Twenty-two healthy males were recruited who were either resistance trained (RES, N = 7), endurance trained (END, N = 8) or sedentary (SED, N = 7). Three sessions were completed; a resting session, a 40 minute run at 50-55% VO2max, and a resistance exercise session. Expired gases were monitored continuously during exercise and the endurance and resistance exercise sessions were individually matched for caloric expenditure. Blood samples were drawn before exercise and 1, 2, 3, and 4 hours after the start of the exercise. Plasma was analysed for LH, DHEAS, cortisol, and free and total testosterone. Androgens increased in response to exercise, particularly resistance exercise, while cortisol only increased after resistance exercise. DHEAS levels increased during the resistance exercise session and remained elevated during recovery in the RES subjects. END subjects displayed less pronounced changes in hormone concentrations in response to exercise than RES subjects. After an initial post-exercise increase, there was a significant decline in free and total testosterone during recovery from resistance exercise (p<0.05), particularly in RES subjects. Based on the results of this study, it appears that the endogenous hormone profile of males is more dependent on exercise mode or intensity than exercise volume as measured by caloric expenditure. The relatively catabolic environment observed during the resistance session may indicate an intensity rather than mode-dependent response.




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