Excitation-induced Ca2+ influx and muscle damage in the rat: loss of membrane integrity and impaired force recovery

The Journal of Physiology
Ulla Ramer MikkelsenT Clausen

Abstract

Prolonged or unaccustomed exercise leads to loss of contractility and muscle cell damage. The possible role of an increased uptake of Ca(2+) in this was explored by examining how graded fatiguing stimulation, leading to a graded uptake of Ca(2+), results in progressive loss of force, impairment of force recovery, and loss of cellular integrity. The latter is indicated by increased [(14)C]sucrose space and lactic acid dehydrogenase (LDH) release. Isolated rat extensor digitorum longus (EDL) muscles were allowed to contract isometrically using a fatiguing protocol with intermittent stimulation at 40 Hz. Force declined rapidly, reaching 11% of the initial level after 10 min and stayed low for up to 60 min. During the initial phase (2 min) of stimulation (45)Ca uptake showed a 10-fold increase, followed by a 4- to 5-fold increase during the remaining period of stimulation. As the duration of stimulation increased, the muscles subsequently regained gradually less of their initial force. Following 30 or 60 min of stimulation, resting (45)Ca uptake, [(14)C]sucrose space, and LDH release were increased 4- to 7-fold, 1.4- to 1.7-fold and 3- to 9-fold, respectively (P < 0.001). The contents of Ca(2+) and Na(+) were also increased (P < 0....Continue Reading

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Citations

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