Thyroxine and Norepinephrine Effects on the Metabolic Rates of Heat-Acclimated Hamsters

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Abstract
Metabolic rates of heat-acclimated hamsters are lower than rates of controls when measured at ambient tempera tures of 32 C and -15 C. Separate administration of norepinephrine or thyroxine decreases the difference between the 2 groups, while their combined administration eliminates the difference entirely when metabolic rates are measured at ambient temperatures of 32 C. Administration of these hormones separately or together does not affect the metabolic rates of the control groups, but slightly stimulates those of the heat-acclimated hamsters, when measured at - 15 C.

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