Abstract

1. 1.|After 6 days at an air temperature of 5°C rats exhibited similar basal metabolic rates (BMR) to controls; rats exposed to cold for 15 and 21 days showed a significantly higher BMR than controls. 2. 2.|During deacclimation from cold the attenuating BMR and tissue thermogenesis pattern are similar. 3. 3.|The major fraction of elevated tissue thermogenesis in the acclimated state and during deacclimation was attributed to enhanced Na +-dependent respiration. 4. 4.|These data support the suggestion of a direct relationship tissue calorigenesis, cell Na + pump activity. BMR and nonshivering thermogenesis during cold acclimation and deacclamtion.

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