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J Appl Physiol 66: 161-166, 1989;
8750-7587/89 $5.00
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Journal of Applied Physiology, Vol 66, Issue 1 161-166, Copyright © 1989 by American Physiological Society

ARTICLES

Hypothalamic-pituitary-adrenal responses to short-duration high-intensity cycle exercise

W. J. Kraemer, J. F. Patton, H. G. Knuttgen, L. J. Marchitelli, C. Cruthirds, A. Damokosh, E. Harman, P. Frykman and J. E. Dziados
Exercise Physiology Division, US Army Research Institute of Environmental Medicine, Natick 01760-5007.

beta-Endorphin (beta-EP), adrenocorticotropin (ACTH), and cortisol plasma concentrations were examined before and after maximal exercise at four intensities [36, 55, 73, and 100% of maximal leg power (MLP)] by means of a computerized cycle ergometer. All intensities were greater than those eliciting peak O2 uptake for the individual subjects. Blood samples were collected at rest, immediately after exercise, and at 5 and 15 min postexercise. Significant (P less than 0.05) increases were observed at 36% MLP for beta-EP and ACTH immediately after exercise and at 5 and 15 min postexercise. Plasma cortisol increased at 36% MLP at 15 min postexercise. Blood lactate significantly increased at all postexercise collection points for exercise intensities of 36, 55, and 73% MLP and at 5 min postexercise for 100% MLP. beta-EP concentrations at 36% MLP were significantly correlated (r = 0.75) with capillary density (mm-2), and cortisol concentrations at 36% MLP were significantly correlated (r = 0.89) with percentage of type II muscle fibers. No other significant relationships were observed. These data show that brief, high-intensity exercise up to maximal power production results in a nonlinear response pattern in peripheral blood hormone concentrations. Furthermore, blood lactate levels do not appear to be related to hypothalamic-pituitary-adrenal hormone plasma concentrations at high exercise intensities.


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