Abstract
Lactate dehydrogenase activity and LDH isoenzyme distribution were determined in supernatants of skeletal muscles consisting predominately of fast-twitch red, fast-twitch white, or slow-twitch intermediate fibers. The LDH activity was highest in the fast-twitch white. The activity in the fast-twitch red was significantly lower than in the fast-twitch white but significantly greater than in slow-twitch intermediate muscle or the heart. LDH 5 was found to be the predominant isoenzyme in both the fast-twitch white and fast-twitch red fibers whereas LDH 1 predominated in both the slow-twitch intermediate fibers and the heart.
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