PMID: 9448944Feb 4, 1998Paper

Quantitative measurement of resting skeletal muscle [Ca2+]i following acute and long-term downhill running exercise in mice

Cell Calcium
G S LynchD A Williams

Abstract

Alteration of resting free intracellular [Ca2+] ([Ca2+]i) homeostasis has been implicated in the aetiology of skeletal muscle fibre injury following damaging pliometric (lengthening or 'eccentric') contractions. Quantitative measurements of resting [Ca2+]i in skeletal muscles following acute or long-term exercise involving such injurious contractions have not been performed. We tested the hypothesis that, following an acute bout of pliometric exercise, the maximum force production (Po) of isolated skeletal muscles would be significantly reduced and that this deficit in force would be accompanied by an elevation in resting skeletal muscle [Ca2+]i. Further, we tested whether long-term pliometric exercise training would protect skeletal muscles from contraction-induced injury. Adult male mice were randomly assigned to either, control, 24-hour, 48-hour, or trained groups. The 24-hour and 48-hour group animals were subjected to a single acute downhill treadmill running bout (decline 16 degrees, at a rate of 13 m/min, for 60 min) and sacrificed at 24 or 48 h, respectively. Trained animals underwent a 14 week endurance training program consisting of a daily (5 days/week) downhill running session, under identical conditions to that of ...Continue Reading

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