Abstract
To examine the responses of the endocrine system to moderate-resistance training in younger (YO) verses middle-aged (MI) men, two groups of men (21 and 49 years-old) participated in 8-week moderate-resistance training program three times per week. Blood was obtained before, immediately after, and 30 min after exercise at before and after training period for analysis of total testosterone, cortisol, GH, lactate and ACTH. Squat and bench press strength, and circumference of thigh and arm increased for both groups. After training, resting testosterone and GH increased in YO; testosterone concentrations were also increased for YO and MI from pre-training values. However, GH values decreased in MI after training period. Cortisol and ACTH values were lower compared to similar times in pre-training. These data indicate that middle-aged men do respond with an enhanced hormonal profile in the early phase of a resistance training program, but the response is different from that of younger men.
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