Abstract
Intraperitoneal administration of guanethidine for 6 weeks to 26 °C acclimated rats (5 mg every third day) resulted in an increased sensitivity to noradrenaline. The observed rise in metabolic response to a single dose of noradrenaline (2 mg/kg, intramuscular) was similar in these guanethidine-treated rats to the hone observed in cold-acclimated rats; however, their cold resistance was not changed. It is concluded that the increased sensitivity to noradrenaline of the chronically cold-exposed rats is not sufficient by itself to explain even in part their increased resistance to cold.

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