Muscle Energetics during Unfused Tetanic Contractions

Modelling the Effects of Series Elasticity
  • Roger C. Woledge
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 453)


During an unfused tetanic contraction the contractile component stretches and then is stetched by the series elasticity in the muscle fibre during each tension oscillations. This causes the heat rate to increase, from increased metabolic rate, during the time when the contractile component is shortening. During the time when the contractile component is being stretched there is heat produced within the contractile component from dissipation of the work stored in the contractile component. A simulation is used to show that these effects are not neglible when the effects of shortening velocity on energy output rate is determined using unfused contraction. The overall effects resemble those that would be produced in a muscle if the effect of shortening velocity in accelerating the rate of cross-bridge cycling were reduced at low activation levels.


Isometric Force Heat Output Energetic Effect Extra Heat Contractile Component 
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Copyright information

© Plenum Press, New York 1998

Authors and Affiliations

  • Roger C. Woledge
    • 1
  1. 1.UCL Institute of Human PerformanceRNOHTBrockley Hill, StanmoreAustralia

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