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猫的快肌和慢肌运动单位中的强直后效应

Post-tetanic effects in motor units of fast and slow twitch muscle of the cat.

作者信息

Bagust J, Lewis D M, Luck J C

出版信息

J Physiol. 1974 Feb;237(1):115-21. doi: 10.1113/jphysiol.1974.sp010473.

Abstract
  1. Motor unit twitches were examined in cat flexor digitorum longus (fast twitch) and soleus (slow twitch) muscles. The time course of the effects of a standard tetanus on the peak twitch tension was plotted and the maximal potentiation or depression (the post-tetanic ratio) was measured.2. The post-tetanic ratio decreased continuously as the twitch time to peak of motor units increased; motor units from flexor digitorum longus and soleus could be described as a single population. The closest approximation to a linear relationship was found by plotting post-tetanic ratio against the reciprocal of time to peak.3. The post-tetanic ratio was also related to the ratio of tetanic to twitch tension. The time of maximum potentiation or depression occurred between 1 and 11 sec, but this variable was unrelated to the time to peak or any other characteristic of the motor unit.
摘要
  1. 在猫的趾长屈肌(快肌)和比目鱼肌(慢肌)中检测运动单位抽搐。绘制标准强直收缩对峰值抽搐张力影响的时间进程,并测量最大增强或抑制(强直后比值)。

  2. 随着运动单位达到峰值的抽搐时间增加,强直后比值持续下降;来自趾长屈肌和比目鱼肌的运动单位可被描述为单一群体。通过绘制强直后比值与达到峰值时间的倒数关系图,发现最接近线性关系。

  3. 强直后比值也与强直张力与抽搐张力的比值有关。最大增强或抑制时间出现在1至11秒之间,但该变量与达到峰值的时间或运动单位的任何其他特征无关。

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The after effects of a tetanus on mammalian muscle.破伤风对哺乳动物肌肉的后续影响。
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