Effect of electrical stimulation and training on muscle pentose transport

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Abstract
Xylose distribution was studied in the gastrocnemius muscle of male Wistar rats, following nephrectomy. The equiiibration of xylose in resting muscle indicated 3 zones of penetration, believed to be a 2-phased extracellular space and the intracellular compartment. In resting muscle, passage of the sugar through the interstitial space appeared to be the rate-limiting factor in its uptake. Electrical stimulation markedly increased both the rate and extent of xylose distribution, brief applications resulting in maximal responses. Competition between xylose and glucose demonstrated by the counterflow technique suggested the enzymic nature of such uptake. The influence of training on sugar uptake was observed in a greater response to submaximal stimulation.