Abstract

1. 1. The body temperature, locomotor activity, and metabolic heat production of golden hamsters maintained under a 14L:10D light-dark cycle were measured at 6-min intervals over several days. 2. 2. The results confirm previous observations of a daily rhythm of locomotor activity and body temperature in this species and provide a record of daily rhythmicity in metabolic heat production. 3. 3. Data analysis indicates that the rhythm of locomotor activity affects but does not determine the rhythm of body temperature and that day-night differences in heat production are significant but play a much smaller role than differences in heat loss in the generation of the body temperature rhythm.

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