Accession Number : AD0644988

Title :   MUSCLE SHORTENING HEAT: ENERGY DISSIPATION DUE TO STRUCTURAL DAMPING.

Descriptive Note : Research communication no. 11,

Corporate Author : DOUGLAS AIRCRAFT CO INC HUNTINGTON BEACH CALIF ADVANCED RESEARCH LAB

Personal Author(s) : Metherell,Alexander F.

Report Date : JUL 1966

Pagination or Media Count : 38

Abstract : 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 + qP)x. Since this expression agrees with A. V. Hill's (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)

Descriptors :   (*MUSCLES, CONTRACTION), MUSCLE PROTEINS, ENERGY, INTERFACES, DAMPING, EQUATIONS, FRICTION, THEORY

Subject Categories : Anatomy and Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE