Effects of heavy-resistance training on hormonal response patterns in younger vs. older men
1 Human Performance Laboratory, Ball State University, Muncie, Indiana 47306; 2 Center for Sports Medicine/Noll Physiological Research Center, Pennsylvania State University, University Park, Pennsylvania 16802; 3 Department of Biology of Physical Activity, University of Jyväskylä, Jyväskylä, Finl...
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Published in | Journal of applied physiology (1985) Vol. 87; no. 3; pp. 982 - 992 |
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Main Authors | , , , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Bethesda, MD
Am Physiological Soc
01.09.1999
American Physiological Society |
Subjects | |
Online Access | Get full text |
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Summary: | 1 Human Performance Laboratory,
Ball State University, Muncie, Indiana 47306;
2 Center for Sports Medicine/Noll
Physiological Research Center, Pennsylvania State University,
University Park, Pennsylvania 16802;
3 Department of Biology of
Physical Activity, University of Jyväskylä,
Jyväskylä, Finland;
4 School of Exercise Science
and Sport Management, Southern Cross University, Lismore, New South
Wales, Australia; 5 Nutrition,
Metabolism, and Exercise Laboratory, Donald W. Reynolds Department
of Geriatrics, University of Arkansas for Medical Sciences, North
Little Rock, Arkansas 72114-1706; and
6 Department of Sport Science,
Colorado College, Colorado Springs, Colorado 80913
To examine the adaptations of the endocrine system to
heavy-resistance training in younger vs. older men, two groups of men (30 and 62 yr old) participated in a 10-wk periodized strength-power training program. Blood was obtained before, immediately after, and 5, 15, and 30 min after exercise at rest before and after training and at
rest at 3, 0, 6, and 10 wk for analysis of total testosterone,
free testosterone, cortisol, growth hormone, lactate, and ACTH
analysis. Resting values for insulin-like growth factor (IGF)-I and
IGF-binding protein-3 were determined before and after training. A
heavy-resistance exercise test was used to evaluate the
exercise-induced responses (4 sets of 10-repetition maximum squats with
90 s of rest between sets). Squat strength and thigh muscle
cross-sectional area increased for both groups. The younger group
demonstrated higher total and free testosterone and IGF-I than the
older men, training-induced increases in free testosterone at rest and
with exercise, and increases in resting IGF-binding protein-3. With
training the older group demonstrated a significant increase in total
testosterone in response to exercise stress along with significant
decreases in resting cortisol. These data indicate that older 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.
endocrine; aging; sarcopenia; strength; muscle; andropause; somatopause; growth factors |
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Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 |
ISSN: | 8750-7587 1522-1601 |
DOI: | 10.1152/jappl.1999.87.3.982 |