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Journal of Applied Physiology, Vol 72, Issue 2 549-554, Copyright © 1992 by American Physiological Society
ARTICLES |
L. L. Ji and R. Fu
Department of Kinesiology, University of Illinois, Urbana 61801.
Glutathione (gamma-glutamylcysteinylglycine) is one of the major antioxidants in the body. The present study investigated the changes of glutathione status, oxidative injury, and antioxidant enzyme systems after an exhaustive bout of treadmill running and/or hydroperoxide injection in male Sprague-Dawley rats. Concentrations of total and reduced glutathione in deep vastus lateralis muscle were significantly increased (P less than 0.01) after exhaustive exercise with either hydroperoxide (t-butyl hydroperoxide) or saline injection, whereas hydroperoxide alone had no significant effect. Exhaustive exercise increased muscle glutathione disulfide content by 75 and 60% (P less than 0.05), respectively, in hydroperoxide and saline groups. Concentrations of glutathione-related amino acids glutamate, cysteine, and aspartate were significantly increased in the same muscle after exhaustion. Hepatic glutathione status was not affected by either hydroperoxide injection or exercise. Glutathione peroxidase, glutathione reductase, superoxide dismutase, and catalase activities were significantly elevated after exhaustive exercise with or without hydroperoxide injection in muscle but not in liver. Hydroperoxide and exhaustive exercise enhanced lipid peroxidation in muscle and liver, respectively. It is concluded that exhaustive exercise can impose a severe oxidative stress on skeletal muscle and that glutathione systems as well as antioxidant enzymes are important in coping with free radical-mediated muscle injury.
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