Abstract

The activity of five acid hydrolases was determined in the homogenates of skeletal muscle consisting of predominantly fast-twitch red, fast-twitch white or slow-twitch intermediate fibers in normal guinea pigs. The specific activities of arylsulfatase A, β-acetylglucosaminidase, β-galactosidase, acid cathepsin and acid phosphatase were found to be highest in the slow-twitch intermediate, medium in the fast-twitch red and lowest in the fast-twitch white fibers. These data provide additional biochemical characteristics of the various types of fibers which constitute guinea pig skeletal muscle.

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