Intrinsic properties and reflex compensation in reinnervated triceps surae muscles of the cat: effect of movement history.
Intrinsic properties and reflex compensation in reinnervated triceps surae muscles of the cat: effect of movement history.
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猫的小腿三头肌重新神经支配的内在特性和反射补偿：运动历史的影响。
DOI：
10.1152/jn.00719.2002
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
Nichols,TRichard
中科院分区：
文献类型：
--
作者：
Huyghues-Despointes,ClotildeMJI;Cope,TimothyC;Nichols,TRichard
在去大脑猫上测量了先前运动对反射肌和无反射肌斜坡牵张反应的影响。比目鱼肌和腓肠肌在终末实验前至少9个月通过神经再支配呈现无屈曲。在斜坡拉伸之前引入缩短阶段增加了肌肉的归一化初始刚度，并且与肌肉在拉伸之前等距收缩的情况相比，降低了神经再支配肌肉屈服的趋势。屈服补偿反射行动的所有幅度之前缩短比目鱼肌和腓肠肌。未处理和神经再支配的肌肉的反应的比较表明，反射动作的贡献与先前的缩短幅度逐渐下降的屈服程度减少。在比目鱼肌，在一个可变的延迟期的等距收缩之间插入缩短和延长力的产生，初始刚度和屈服恢复到水平与等距收缩的历史。然而，这些属性以不同的速率恢复，表明不同的过程是负责初始刚度和屈服。无论插入延迟的长度或先前缩短的幅度如何，屈服都通过反射动作得到补偿。这些和以前的研究结果表明，牵张反射调节肌肉僵硬的范围很广的条件。这种调节显然是由于梭内肌和梭外肌的互补机械特性。
Effects of prior motion on ramp stretch responses of reflexive and areflexive muscles were measured in decerebrate cats. Soleus and gastrocnemius muscles were rendered areflexive by reinnervation a minimum of 9 mo before the terminal experiments. The introduction of a shortening phase prior to the ramp stretch increased the normalized initial stiffness of muscles and decreased the tendency to yield of the reinnervated muscles as compared with the case in which muscles contracted isometrically prior to stretch. Yielding was compensated by reflex action for all amplitudes of prior shortening in soleus and gastrocnemius muscles. The comparison of responses of untreated and reinnervated muscles indicated that the contribution of reflex action progressively declined with the amplitude of prior shortening as the extent of yielding diminished. In soleus muscle, during a variable delay period of isometric contraction interposed between shortening and lengthening force generation, initial stiffness and yielding returned to levels seen with isometric contractile history. However, these attributes recovered at different rates, suggesting that distinct processes are responsible for initial stiffness and yielding. Yielding was compensated for by reflex action regardless of the length of the interposed delay or of the amplitude of the prior shortening. These and previous findings indicate that the stretch reflex regulates muscular stiffness for a wide range of conditions. This regulation apparently arises from complementary mechanical properties of intrafusal and extrafusal muscle.