期刊
EXPERIMENTAL GERONTOLOGY
卷 43, 期 6, 页码 571-577出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.exger.2008.03.002
关键词
L-arginine; exhaustive exercise; oxidative stress; inflammation; aging
In this study, we report protective effects of dietary L-arginine (L-Arg) supplementation against oxidative stress and inflammation in aging rats during exhaustive exercise. Thirty 18-month-old male Sprague-Dawley rats were randomly divided into four groups: sedentary control (SC); sedentary control with L-Arg treatment (SC+Arg); exhaustive exercise (E); and exhaustive exercise with L-Arg treatment (E + Arg). Rats in groups SC + Arg and E + Arg received a 2% L-Arg diet. Rats in groups E and E + Arg performed an exhaustive running test on a treadmill. The mean duration of exercise differed significantly between groups E and E + Arg (51 +/- 6 versus 63 +/- 3 min). Results showed significant increases in xanthine oxidase (XO) and myeloperoxidase (MPO) activities and in lipid peroxidation end-product (malondialdehyde, MDA) levels of myocardial, muscular, hepatic, pulmonary, and renal tissues of exercised rats compared with SC and SC + Arg rats. The increased XO and MPO activities and MDA levels significantly decreased in exercised rats that were fed a diet supplemented with L-Arg. We also found that L-Arg supplementation prevented exhaustive exercise-induced elevations of plasma aminotransferase activity, and lactate and uric acid levels in aging rats. These findings suggest that L-Arg supplementation enhances exercise capacity and protects against oxidative damage and inflammatory responses caused by exhaustive exercise in aging rats. (c) 2008 Elsevier Inc. All rights reserved.
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