Myofilament Compliance and Sarcomere Tension-Stiffness Relation during the Tetanus Rise in Frog Muscle Fibres

  • M. A. Bagni
  • G. Cecchi
  • B. Colombini
  • F. Colomo
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 453)


The sarcomere stiffness was measured in single muscle fibres during the development of tetanic tension using a method insensitive to fibre inertia and viscosity. The stiffness was calculated as the ratio between tension changes and sarcomere length changes during a period of fast sarcomere elongation at constant velocity. The results show that, unlike previous measurements with step or sinusoidal length changes, the relation between relative force and relative stiffness on the tetanus rise is linear. Consequently, the development of stiffness upon stimulation is synchronous with the development of force. Since a substantial fraction of sarcomere compliance is localized in the myofilaments, this result can be accounted for by assuming that either myofilament compliance is highly non-linear or that crossbridges stiffness during the tetanus rise is not proportional to crossbridge tension.


Length Change Force Response Sarcomere Length Stiffness Measurement Single Muscle Fibre 
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Copyright information

© Plenum Press, New York 1998

Authors and Affiliations

  • M. A. Bagni
    • 1
  • G. Cecchi
    • 1
  • B. Colombini
    • 1
  • F. Colomo
    • 1
  1. 1.Dipartimento di Scienze FisiologicheFirenzeItaly

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