Hibernation in Black Bears: Independence of Metabolic Suppression from Body Temperature
Hibernation in Black Bears: Independence of Metabolic Suppression from Body Temperature
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DOI：
10.1126/science.1199435
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发表时间：
2011-02-18
期刊：
影响因子：
56.9
通讯作者：
Barnes, Brian M.
中科院分区：
文献类型：
--
作者：
Toien, Oivind;Blake, John;Barnes, Brian M.
黑熊每年冬眠5到7个月，在这段时间里，不吃、不喝、不小便、不排便。我们测量了冬眠黑熊的代谢率和体温，发现它们在将体温从30摄氏度调节到36摄氏度的多日周期内，将新陈代谢抑制到基础代谢率的25%。心率从每分钟55次降至每分钟9次，伴有深度窦性心律失常。在恢复正常体温并从洞穴中出来后，熊的代谢率降低了长达3周。冬眠熊代谢率的显著降低和延迟恢复表明，冬眠期间的大部分代谢抑制与体温降低无关。
Black bears hibernate for 5 to 7 months a year and, during this time, do not eat, drink, urinate, or defecate. We measured metabolic rate and body temperature in hibernating black bears and found that they suppress metabolism to 25% of basal rates while regulating body temperature from 30 degrees to 36 degrees C, in multiday cycles. Heart rates were reduced from 55 to as few as 9 beats per minute, with profound sinus arrhythmia. After returning to normal body temperature and emerging from dens, bears maintained a reduced metabolic rate for up to 3 weeks. The pronounced reduction and delayed recovery of metabolic rate in hibernating bears suggest that the majority of metabolic suppression during hibernation is independent of lowered body temperature.