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[Carbohydrate and lipid metabolism in rats during adaptation to cold].

Cold adapted rats are shown to have glucose and fatty acids concentration in blood inchanged, lactate concentration increased and triglyceride concentration decreased against the control level. Glucose utilization rate in the tolerance test grows. Glycogen content falls, hexokinase and succinate dehydrogenase activity increases, glucose-6-phosphatase and NAD+-isocytratedehydrogenase activity decreases in the liver of experimental animals. The results indicate that utilization of carbohydrate and lipid substrates for thermogenesis is intensified in cold-adapted rats. The hypothesis is supported by the data of tests dealing with IPNA injection or with bringing the animals back under thermocomfortable conditions.