Potentiated muscular thermogenesis in cold-acclimated muscovy duckling.
Potentiated muscular thermogenesis in cold-acclimated muscovy duckling.
复制标题
冷驯化番鸭的肌肉生热作用增强。
DOI：
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发表时间：
1985
影响因子：
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通讯作者：
J. Rouanet
中科院分区：
文献类型：
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作者：
H. Barré;A. Geloen;J. Chatonnet;A. Dittmar;J. Rouanet
在4 ℃条件下饲养21天，研究了26 ~ 27天冷驯化番鸭的非颤抖性产热能力。在-10至28摄氏度的环境温度下测量代谢率和综合肌电图（EMG）肌肉活动。与对照组相比，30 ℃条件下饲养的CA雏鸭具有更强的抗寒能力，在极冷条件下具有更高的峰值代谢率。CA雏鸭的颤抖阈值温度比下临界温度低14.2 ℃，而对照组的两个温度相似。因此，CA雏鸭表现出NST在中度寒冷。此外，在产生颤抖的温度下，即使在较高的代谢率下，CA小鸭肌肉的EMG活动也低于对照组。由于这些雏鸭缺乏棕色脂肪组织，这些结果表明，在CA雏鸭肌肉活动的产热效率增加。
The capacity for nonshivering thermogenesis (NST) was examined in 26- to 27-day cold-acclimated (CA) muscovy ducklings reared for 21 days at 4 degrees C. Metabolic rate and integrated electromyographic (EMG) muscle activity were measured at ambient temperature ranging from -10 to 28 degrees C. Compared with controls reared at 30 degrees C, CA ducklings were more resistant to cold and had higher peak metabolic rate in extreme cold. Shivering threshold temperature of CA ducklings was 14.2 degrees C lower than lower critical temperature, whereas for controls the two temperatures were similar. Thus CA ducklings exhibited an NST in moderate cold. In addition, at temperatures that produced shivering, EMG activity in CA duckling muscle was lesser than that of controls, even at a higher metabolic rate. Because these ducklings are devoid of brown adipose tissue, these results indicated an increased thermogenic efficiency of muscular activity in CA ducklings.