Series elastic properties of skinned muscle fibres in contraction and rigor
- 1 January 1978
- journal article
- research article
- Published by Springer Nature in Pflügers Archiv - European Journal of Physiology
- Vol. 373 (1), 21-24
- https://doi.org/10.1007/bf00581144
Abstract
Isometric tension of skinned fibres from the frog semitendinosus muscle is sigmoidally related to Ca2+ concentration betweenpCa 7 and 6. Stiffness measurements showed that the Ca2+-activated tension may be due to recruitment of attached cross-bridges. In the absence of ATP (rigor solution) the skinned fibre develops a rigor tension which reaches about 80–110% of the maximum Ca2+-activated tension. However, stiffness measurements showed that in rigor many more cross-bridges are attached to actin at any one moment than in contraction. It was concluded that the force per cross-bridge is 37% smaller in rigor than in contraction.Keywords
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