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Effect of estradiol on tissue glycogen metabolism and lipid availability in exercised male rats



Effect of estradiol on tissue glycogen metabolism and lipid availability in exercised male rats



Journal of Applied Physiology 71(5): 1694-1699



The effect of 17.beta.-estradiol 3-benzoate (10 .mu.g .cntdot. 0.1 ml sunflower oil-1 .cntdot. 100 g body wt-1) on exercise performance, tissue glycogen utilization, and lipid availability was determined in male rats. In experiment 1, estradiol or oil was administered 1 h or 1-6 days before a treadmill run to exhaustion. No differences in body weight between oil- and estradiol-administered animals were observed during the 6-day treatment. Animals receiving estradiol for 3-6 days ran significantly longer and completed more work than oil-administered animals. Significant degradation of red and white vastus muscle, myocardial, and liver glycogen was observed in all animals to run to exhaustion. In experiment 2, animals were administered estradiol for 5 days and then run for 2 h. The submaximal run for 2 h significantly reduced tissue glycogen content in red and white vastus muscle, heart, and liver of oil-administered animals. The latter effect was attenuated in both vastus muscles, liver, and myocardial tissues in the estradiol-administered animals. Estradiol administration significantly increased plasma fatty acids and lowered plasma lactate during the submaximal run. These data indicate that when body weight remained constant between groups of male rats, estradiol administration for 3-6 days increased exercise performance. Furthermore, estradiol administration for 5 days resulted in greater lipid availability and less tissue glycogen utilization during submaximal running for 2 h.

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Accession: 002082075

Download citation: RISBibTeXText

PMID: 1761465

DOI: 10.1152/jappl.1991.71.5.1694


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