[The role of the heart in rewarming the body of hibernating animals upon arousal].

The heart of ground squirrels is covered by a large amount of brown adipose tissue during the whole period of hibernation. During arousal and rewarming of heterothermal rodents, the highest temperature is detected in the brown adipose tissue and in the heart. During hibernation the heart rate is 10-12/min. On arousal, beginning from the early stage when the heart temperature is still low, a significant increase in the heart rate occurs followed by acceleration of the body rewarming of heterothermal animals.