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• W2000304628 abstract "The role of prolonged electrical stimulation on sarcoplasmic reticulum (SR) Ca 2+ sequestration measured in vitro and muscle energy status in fast white and red skeletal muscle was investigated. Fatigue was induced by 90 min intermittent 10-Hz stimulation of rat gastrocnemius muscle, which led to reductions (p < 0.05) in ATP, creatine phosphate, and glycogen of 16, 55, and 49%, respectively, compared with non-stimulated muscle. Stimulation also resulted in increases (p < 0.05) in muscle lactate, creatine, Pi, total ADP, total AMP, IMP, and inosine. Calculated free ADP (ADP f ) and free AMP (AMP f ) were elevated 3- and 15-fold, respectively. No differences were found in the metabolic response between tissues obtained from the white (WG) and red (RG) regions of the gastrocnemius. No significant reductions in SR Ca 2+ ATPase activity were observed in homogenate (HOM) or a crude SR fraction (CM) from WG or RG muscle following exercise. Maximum Ca 2+ uptake in HOM and CM preparations was similar in control (C) and stimulated (St) muscles. However, Ca 2+ uptake at 400 nM free Ca 2+ was significantly reduced in CM from RG (0.108 ± 0.04 to 0.076 ± 0.02 μmol∙mg −1 protein∙min −1 in RG–C and RG–St, respectively). Collectively, these data suggest that reductions in muscle energy status are dissociated from changes in SR Ca 2+ ATPase activity in vitro but are related to Ca 2+ uptake at physiological free [Ca 2+ ] in fractionated SR from highly oxidative muscle. Dissociation of SR Ca 2+ ATPase activity from Ca 2+ uptake may reflect differences in the mechanisms evaluated by these techniques.Key words: sarcoplasmic reticulum, contractile activity, Ca 2+ sequestration, energy status, red and white gastrocnemius." @default.
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• W2000304628 date "1995-08-01" @default.
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• W2000304628 title "Effects of prolonged low frequency stimulation on skeletal muscle sarcoplasmic reticulum" @default.
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• W2000304628 doi "https://doi.org/10.1139/y95-165" @default.
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