MUSCLE SHORTENING HEAT: ENERGY DISSIPATION DUE TO STRUCTURAL DAMPING.
Research communication no. 11,
DOUGLAS AIRCRAFT CO INC HUNTINGTON BEACH CALIF ADVANCED RESEARCH LAB
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The paper presents a study to predict theoretically the main source and effect of structural damping in the contractile component of muscle. The most obvious sources is the coulomb friction effects at the contact sites between the myosin cross-bridges and the actin filaments. The equation derived for the energy dissipated during filament sliding due to the friction at these sites is Energy dissipation pPo qPx. Since this expression agrees with A. V. Hills 1964a equation for heat of shortening, it is concluded that heat of shortening is a structural damping phenomenon. The interface tension theory presented in the preceding paper Metherell, 1966 is modified to take account of these structural damping effects. The energy relation, when taking account of the strain energy h stored in the series elastic component, is shown to be E A alpha x We h which is the same as the equation that Hill 1964c obtained experimentally. Author
- Anatomy and Physiology