Effect of natural exercise on pentose transport in rat skeletal muscle

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Abstract
Increased xylose distribution has been shown in the muscles of male Wistar rats exercised by swimming and running. Two effects of training were demonstrated in these experiments. When animals were exercised by the same mode of exercise used for their training, the xylose distribution in the trained muscles was lower than in untrained muscle. This indicated an acquired aptitude by the trained animals so that their effort during the test was less than that of the untrained animals. When this effect was eliminated by having the animals use an unfamiliar mode of exercise, increased xylose distribution was observed in the trained muscles. Whereas electrical stimulation readily promoted maximal rates of xylose uptake, exercise-induced uptake rates were essentially submaximal. This emphasizes the significance of training in promoting an enhanced supply of glucose to working muscle.

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