大鼠快、慢骨骼肌运动单位的特性
Properties of motor units in fast and slow skeletal muscles of the rat.
作者信息
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出版信息
J Physiol. 1967 Nov;193(1):45-55. doi: 10.1113/jphysiol.1967.sp008342.
Abstract
- Three kinds of motor unit have been distinguished in soleus (SOL) and extensor digitorum longus (EDL) muscles of adult rats on the basis of differences in isometric twitch contraction times measured at 35 degrees C.2. SOL contains about thirty motor units of which about twenty-seven are slow and three are intermediate with average contraction times of 38 and 18 msec respectively.3. EDL contains about forty fast motor units with an average contraction time of 11 msec.4. Average values for maximum isometric tetanic tension were 4.7 g for fast and slow units and 5.85 g for intermediate units.5. Average values for twitch-tetanus ratios ranged from 0.2 to 0.227 for EDL muscles, SOL muscles and the three kinds of motor units.
摘要
根据在35摄氏度下测量的等长收缩时间差异，已在成年大鼠的比目鱼肌（SOL）和趾长伸肌（EDL）中区分出三种运动单位。
比目鱼肌包含约30个运动单位，其中约27个是慢肌运动单位，3个是中间型运动单位，平均收缩时间分别为38毫秒和18毫秒。
趾长伸肌包含约40个快肌运动单位，平均收缩时间为11毫秒。
快肌和慢肌运动单位的最大等长强直张力平均值为4.7克，中间型运动单位为5.85克。
趾长伸肌、比目鱼肌以及三种运动单位的收缩-强直张力比值平均值在0.2至0.227之间。
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