Abstract
In loosely-restrained adult conscious rats exposed to stepwise changes in ambient temperature ( T a) from 25 to 5°C or from 20 to 35°C, we have recorded body and tail temperatures, metabolic rate (VO 2), shivering and ventilation (V). It was found that VO 2 and V vary with T a and show a nadir for a T a of 30°C whereas shivering starts at 20°C and increases progressively with cold exposure. T tail follows changes in T a whereas T body decreases slightly in cold and increases markedly in warm exposure. These results suggest that the control of T body interacts with the control of breathing in order to increase VO 2 during cold exposure and to facilitate evaporative respiratory heat dissipation during warm exposure.
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