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Sarcomere dynamics during muscular contraction and their implications to muscle function

Journal of Muscle Research and Cell Motility volume 28, pages 89–104 (2007)Cite this article

Abstract

This article attempts to identify the key aspects of sarcomere inhomogeneity and the dynamics of sarcomere length changes in muscle contraction experiments and focuses on understanding the mechanics of myofibrils or muscle fibres when viewed as independent units of biological motors (the half-sarcomeres) connected in series. Muscle force generation has been interpreted traditionally on the basis of the kinetics of crossbridge cycling, i.e. binding of myosin heads to actin and consecutive force generating conformational change of the head, under controlled conditions and assuming uniformity of sarcomere or half-sarcomere behaviour. However, several studies have shown that re-distribution of internal strain within myofibrils and muscle fibres may be a key player, particularly, during stretch or relaxation so that force kinetics parameters are strongly affected by sarcomere dynamics. Here, we aim to shed light on how force generation, crossbridge kinetics, and the complex sarcomere movements are to be linked and which mechanical concepts are necessary to develop a comprehensive contraction model of a myofibril.

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Acknowledgements

The authors are grateful to KW Ranatunga (Bristol) and Robert Stehle (Cologne) for valuable suggestions on the manuscript, and to the reviewers of this article for constructive comments.

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  1. Ivo A. Telley

    Present address: European Molecular Biology Laboratory (EMBL), 69117, Heidelberg, Germany

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  1. ETH Zurich, Institute for Biomechanics, HCI E 357.1, 8093, Zurich, Switzerland

    Ivo A. Telley & Jachen Denoth

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Telley, I.A., Denoth, J. Sarcomere dynamics during muscular contraction and their implications to muscle function. J Muscle Res Cell Motil 28, 89–104 (2007). https://doi.org/10.1007/s10974-007-9107-8

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Keywords

  • Inhomogeneity
  • Myofibril mechanics
  • Half-sarcomere
  • Relaxation