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. 1971 Mar;50(3):570-3.
doi: 10.1172/JCI106526.

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

W Fiehn, J B Peter

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

W Fiehn et al. J Clin Invest. 1971 Mar.

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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References

    1. J Biochem. 1968 Mar;63(3):324-31 - PubMed
    1. Biochim Biophys Acta. 1964 May 25;79:581-91 - PubMed
    1. Biochem Biophys Res Commun. 1964 Jul 27;16(5):438-43 - PubMed
    1. J Lab Clin Med. 1969 Jul;74(1):160-5 - PubMed
    1. J Biol Chem. 1970 Nov 10;245(21):5545-52 - PubMed