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慢肌纤维和快肌纤维的电特性与收缩特性的差异。

Differentiation of electrical and contractile properties of slow and fast muscle fibres.

作者信息

Gordon T, Purves R D, Vrbová G

出版信息

J Physiol. 1977 Aug;269(3):535-47. doi: 10.1113/jphysiol.1977.sp011913.

Abstract
  1. The development of the electrical and contractile properties of slow anterior latissimus dorsi (ALD) and fast posterior latissimus dorsi (PLD) muscles of the chick was studied. 2. At the earliest ages studied (14-16 days of incubation), the membrane resistance was similar in both muscles. Subsequently the membrane resistance of PLD decreased, and that of ALD increased. Electrical differentiation continued after hatching. 3. The contractile speeds of ALD and PLD muscles were similar in embryos at 14-16 days of incubation, and suddenly differentiated at 17-18 days. Unlike the electrical properties, contractile speeds changed little after hatching. 4. It is suggested that the different electrical properties of the membrane of the two types of muscle fibre develop as a result of the particular type of excitation imposed by their nerves.
摘要
  1. 研究了鸡的慢型背阔肌(ALD)和快型背阔肌(PLD)的电特性和收缩特性的发育情况。2. 在最早研究的年龄(孵化14 - 16天),两块肌肉的膜电阻相似。随后,PLD的膜电阻下降,而ALD的膜电阻增加。孵化后电分化仍在继续。3. 在孵化14 - 16天的胚胎中,ALD和PLD肌肉的收缩速度相似,并在17 - 18天突然分化。与电特性不同,孵化后收缩速度变化很小。4. 有人提出,两种类型肌纤维膜的不同电特性是由其神经施加的特定类型的兴奋所致。

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