Contraction-induced injury to single fiber segments from fast and slow muscles of rats by single stretches

The American Journal of Physiology
P C MacphersonJohn A Faulkner

Abstract

Susceptibility to contraction-induced injury was investigated in single permeabilized muscle fiber segments from fast extensor digitorum longus and slow soleus muscles of rats. We tested the hypotheses that, after single stretches of varying strains and under three conditions of Ca2+ activation (none, submaximum, and maximum), 1) the magnitude of the deficit in maximum isometric force is dependent on the work done to stretch the fiber, and 2) for each condition of activation and strain, fast fibers incur greater force deficits than slow fibers. When all data on force deficits were analyzed together, the best predictors of the overall force deficits for both fast and slow muscle fibers were linear regression models that introduced the simultaneous but independent effects of strain and average force (r2 = 0.52 and 0.63, respectively). Under comparable conditions, greater force deficits were produced in fast than slows fibers. Despite differences in the strain required to produce injury in fast and slow muscle fibers, for a given force deficit, the ultrastructural damage was strikingly similar.

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Citations

Jan 1, 1997·Journal of Applied Physiology·K D Hunter, J A Faulkner
Dec 9, 1998·The American Journal of Physiology·G S Lynch, J A Faulkner
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