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Research Article Free access | 10.1172/JCI106526

Properties of the fragmented sarcoplasmic reticulum from fast twitch and slow twitch muscles

W. Fiehn and J. B. Peter

Department of Medicine, School of Medicine, University of California, Los Angeles, California 90024

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Department of Medicine, School of Medicine, University of California, Los Angeles, California 90024

Find articles by Peter, J. in: PubMed | Google Scholar

Published March 1, 1971 - More info

Published in Volume 50, Issue 3 on March 1, 1971
J Clin Invest. 1971;50(3):570–573. https://doi.org/10.1172/JCI106526.
© 1971 The American Society for Clinical Investigation
Published March 1, 1971 - Version history
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Abstract

Skeletal muscle of guinea pigs is composed of at least three types of fibers which are distinguishable by their kinetic and histochemical properties. Fast twitch muscles may be histochemically red or white; fragmented sarcoplasmic reticulum (FSR) prepared from both types of fast twitch muscles has identical calcium-accumulating capacity (maximal calcium uptake) and calcium-concentrating ability. FSR from slow twitch muscles accumulates less total calcium, but the calcium-concentrating ability is equal to that of fast twitch muscles. The slower rate of calcium accumulation by FSR of slow twitch muscles correlates with a prolonged relaxation time.

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