Acute hormonal responses to heavy resistance exercise in younger and older men |
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Authors: | William J Kraemer Keijo H?kkinen Robert U Newton Matthew McCormick Bradley C Nindl Jeff S Volek Lincoln A Gotshalk Steven J Fleck Wayne W Campbell Scott E Gordon Peter A Farrell and William J Evans |
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Institution: | (1) Noll Physiological Research Center and Laboratory for Sports Medicine, Pennsylvania State University, 21 REC Bldg, University Park, PA 16802, USA, US;(2) Department of Biology of Physical Activity, The University of Jyvaskyla, Jyvaskyla, Finland, FI;(3) Department of Exercise Science and Sport Management, Southern Cross University, Lismore, NSW, Australia, AU |
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Abstract: | The purpose of this investigation was to examine the acute responses of several hormones total and free testosterone (TT
and FT, respectively), adrenocorticotropic hormone (ACTH), cortisol (C), growth hormone (GH), and insulin (INS)] to a single
bout of heavy resistance exercise (HRE). Eight younger 30-year (30y) group] and nine older 62-year (62y) group] men matched
for general physical characteristics and activity levels performed four sets of ten repetitions maximum (RM) squats with 90 s
rest between sets. Blood samples were obtained from each subject via an indwelling cannula with a saline lock pre-exercise,
immediately post-exercise (IP), and 5, 15 and 30 min post-exercise. Levels of TT, FT, ACTH, C and lactate significantly increased
after HRE for both groups. Pre-HRE pairwise differences between groups were noted only for FT, while post-HRE pairwise differences
were found for TT, FT, GH, glucose and lactate. Area under the curve analysis showed that the 30y group had a significantly
higher magnitude of increase over the entire recovery period (IP, 5, 15, and 30 min post-exercise) for TT, FT, ACTH and GH.
Few changes occurred in the INS response with the only change being that the 62y group demonstrated a decrease IP. Lactate
remained elevated at 30 min post-HRE. This investigation demonstrates that age-related differences occur in the endocrine
response to HRE, and the most striking changes appear evident in the FT response to HRE in physically active young and older
men.
Accepted: 11 June 1997 |
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Keywords: | Aging Neuroendocrine Resistance exercise Growth factors |
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