Adaptations to exercise training and contraction-induced muscle injury in animal models of muscular dystrophy.

Abstract:

:This article reviews the current status of exercise training and contraction-induced muscle-injury investigations in animal models of muscular dystrophy. Most exercise-training studies have compared the adaptations of normal and dystrophic muscles with exercise. Adaptation of diseased muscle to exercise occurs at many levels, starting with the extracellular matrix, but also involves cytoskeletal architecture, muscle contractility, repair mechanisms, and gene regulation. The majority of exercise-injury investigations have attempted to determine the susceptibility of dystrophin-deficient muscles to contraction-induced injury. There is some evidence in animal models that diseased muscle can adapt and respond to mechanical stress. However, exercise-injury studies show that dystrophic muscles have an increased susceptibility to high mechanical forces. Most of the studies involving exercise training have shown that muscle adaptations in dystrophic animals were qualitatively similar to the adaptations observed in control muscle. Deleterious effects of the dystrophy usually occur only in older animals with advanced muscle fiber degeneration or after high-resistive eccentric training. The main limitations in applying these conclusions to humans are the differences in phenotypic expression between humans and genetically homologous animal models and in the significant biomechanical differences between humans and these animal models.

journal_name

Am J Phys Med Rehabil

authors

Carter GT,Abresch RT,Fowler WM Jr

doi

10.1097/00002060-200211001-00016

subject

Has Abstract

pub_date

2002-11-01 00:00:00

pages

S151-61

issue

11 Suppl

eissn

0894-9115

issn

1537-7385

journal_volume

81

pub_type

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