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- Title
Pituitary–adrenal responses to arm versus leg exercise in untrained man.
- Authors
Carl M.Maresh; Sökmen, Bülent; Kraemer, William J.; Hoffman, Jay R.; Watson, Greig; Judelson, Daniel A.; Gabaree-Boulant, Catherine L.; Deschenes, Michael R.; VanHeest, Jaci L.; Armstrong, Lawrence E.
- Abstract
The purpose of this study was to examine pituitary–adrenal (PA) hormone responses [beta-endorphin (β-END), adrenocorticotropic hormone (ACTH) and cortisol] to arm exercise (AE) and leg exercise (LE) at 60 and 80% of the muscle-group specific VO2 peak. Eight healthy untrained men (AE VO2 peak=32.4±3.0 ml kg−1 min−1, LE VO2 peak=46.9±5.3 ml kg−1 min−1) performed two sub-maximal AE and LE tests in random order. Plasma β-END, ACTH and cortisol were not different ( P>0.05) between AE and LE at either exercise intensity; the 60% testing elicited no changes from pre-exercise (PRE) values. For 80% testing, plasma β-END, ACTH and cortisol were consistently, but not significantly, greater during LE than AE. In general, plasma β-END and ACTH were higher ( P<0.05) during 80% exercise, than PRE, for both AE and LE. Plasma cortisol was elevated ( P<0.05) above PRE during 80% LE, and following 80% for both AE and LE. Plasma ACTH was higher ( P<0.05) during 80% LE and AE versus 60% LE and AE, respectively. Plasma β-END and cortisol were significantly higher during and immediately after 80% LE than 60% LE. Thus, plasma β-END, ACTH and cortisol responses were similar for AE and LE at the two relative exercise intensities, with the intensity threshold occurring somewhere between 60 and 80% of VO2 peak. It appears that the smaller muscle mass associated with AE was sufficient to stimulate these PA axis hormones in a manner similar to LE, despite the higher metabolic stress (i.e., plasma La-) associated with LE.
- Publication
European Journal of Applied Physiology, 2006, Vol 97, Issue 4, p471
- ISSN
1439-6319
- Publication type
Academic Journal
- DOI
10.1007/s00421-006-0198-5