WEIGHTS AND COMPOSITION OF MUSCLES OF WARM- AND COLD-ACCLIMATED RATS

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Abstract
After cold acclimation at 6 °C. white rats have a smaller muscle mass than control animals of the same age kept at 30 °C. Water and protein determinations in soleus and gastrocnemius muscles as well as in the whole muscular mass revealed that the reduction in the muscle mass after cold acclimation is a real tissue difference due to a reduced protein deposition and not only a water content difference. Apparently red and white fibers are equally affected in their growth by the prolonged cold exposure. Measurements of number and size of muscle fibers in soleus cross sections strongly suggest that protein deposition had been reduced in the same proportion in both muscle fibers and connective tissue.

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