Journal of Applied Physiology
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J Appl Physiol 73: 388-392, 1992;
8750-7587/92 $5.00
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Journal of Applied Physiology, Vol 73, Issue 1 388-392, Copyright © 1992 by American Physiological Society

ARTICLES

Plasma Met-enkephalin and catecholamine responses to intense exercise in humans

J. B. Boone Jr, T. Sherraden, K. Pierzchala, R. Berger and G. R. Van Loon
Department of Medicine, University of Kentucky, Lexington.

Native and cryptic Met-enkephalin and catecholamines are coreleased in response to stress. However, it is not known whether Met-enkephalin and catecholamines exhibit concurrent temporal relationships in response to exercise. The purpose of this investigation was to examine the corelease of catecholamines and Met-enkephalin in endurance-trained (n = 6) and untrained (n = 6) male subjects during a 6-min bout of exercise: 4 min at 70% of maximal O2 uptake (VO2max) followed by 2 min at 120% VO2max. Peak catecholamine levels were found at 1 min of recovery. In trained subjects, native Met-enkephalin peaked during exercise at 70% VO2max, declined during exercise at 120% VO2max, and returned to basal levels by 1 min of recovery. In the untrained subjects, native Met-enkephalin peaked at 120% VO2max (6 min) and returned to baseline by 5 min of recovery. In both groups, cryptic Met-enkephalin peaked at 70% VO2max and returned to basal levels during exercise at 120% VO2max. These data demonstrate that during exercise there is a temporal dissociation in plasma levels of Met-enkephalin and catecholamines.


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