Can the mode of training affect the hormone response to different modes of exercise?

DECEMBER 3, 2003 (Bethesda, MD) -- There are a number of reasons why, in men, the manipulation of anabolic hormones (such as testosterone) and the anabolic/catabolic hormone ratio (e.g., testosterone/cortisol) might be beneficial. From the perspective of an athlete, an increase in anabolic-androgenic hormones can improve performance by decreasing body fat and increasing lean body mass and muscular strength. Among older men, it may help to replace the decline in testosterone, which can negatively affect body composition and physical function.

Studies have shown that endurance-trained men tend to have lower levels of testosterone compared to their sedentary counterparts and that resistance-trained men have higher basal testosterone levels. Studies have also found that both endurance- and resistance-trained males had lower testosterone levels than sedentary control subjects. Thus, while it is known that training status can influence the hormone response to exercise, it is not clear whether the mode of training can affect the hormone response to different modes of exercise. Such information could be useful in designing training regimes that will result in the most favorable ratio of anabolic and catabolic hormones.

A first-of-its-kind study attempts to determine the acute steroid hormone response to endurance and resistance exercise bouts of equitable volume in subjects with differing training status. The newly released findings conclude that the circulating endogenous hormone profile is more dependent on exercise mode or intensity than on exercise volume as measured by caloric expenditure. The study also provides evidence that hormone levels and exercise-induced hormone changes are different in subjects of different training status.

A New Study

The authors of the study, entitled, "Effect of Training Status and Exercise Mode on Endogenous Steroid Hormones in Males," are Mark S. Tremblay, Jennifer L. Copeland, and Walt

Contact: Donna Krupa
American Physiological Society

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