Issn Print: 0195-9131
Publication Date: 1996/05/01
THE ACUTE AND CHRONIC HORMONAL RESPONSES OF YOUNGER VS. OLDER MEN TO PERIODIZED STRENGTH/POWER TRAINING 131
B. C. Nindl; W. J. Kraemer; R. U. Newton; W. J. Evans; S. E. Gordon; M. R. McCormick; J. S. Volek; S. A. Mazzetti; W. W. Campbell; K. Häkkinen
Excerpt
Few data are available on hormonal responses to periodized high-intensity strength/power training (SPT) in older men. This study examined the effects of an acute resistance exercise test (ARET; 4 sets of 10 RM squats with 90 s rest between sets) before and after 10 wk of periodized (3X/wk) total-body SPT on serum concentrations of total testosterone (TT), free testosterone (FT), adrenocorticotropic hormone (ACTH) and cortisol (C) in 8 younger (Y; 29.8±5.3 yrs) and 9 older (O; 62.0±3.2 yrs) healthy men. Fasted venous blood was obtained at rest and at 1, 5, 15 and 30 min after the ARET. SPT increased (≈15%) 1-RM squat for both groups. Hormonal data was analyzed with a 3-way ANOVA with repeated measures (p<.05). Resting TT and FT were higher in the Y vs. O, both before and after SPT. TT and FT increased with ARET, both pre- and post- SPT. Resting FT, but not TT was higher after 10 wks of SPT, compared with pre-SPT concentrations for both groups. After SPT, the ARET-induced rise in FT was greater in Y vs. O. Resting ACTH and C were similar for Y and O before SPT and were similarly lower after 10 wks of SPT. Both ACTH and C were increased after ARET, both before and after SPT. However, for ACTH only, a significant interaction existed between training and the ARET indicating an attenuated response post-training. These findings show that of the hormonal responses measured, Y and O only differed in the magnitude FT response (both acute & chronic) and suggest that the increase in muscle protein accumulation resulting from short and long-term SPT may be partially mediated by increased levels of FT and decreased ACTH levels mediating lower C levels.
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