Limitations in the servo-regulation of soleus muscle stiffness in premammillary cats
Limitations in the servo-regulation of soleus muscle stiffness in premammillary cats
复制标题
前乳头猫比目鱼肌硬度伺服调节的局限性
DOI：
10.1007/978-1-349-06022-1_34
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发表时间：
1981
期刊：
影响因子：
--
通讯作者：
S. Andreassen
中科院分区：
文献类型：
--
作者：
J. Hoffer;S. Andreassen
最近有人提出本体感觉反射可以调节肌肉僵硬。为了检验这一假设，我们研究了在乳头前水平去大脑的猫的比目鱼肌中长度扰动的幅度、形状和速度的影响，以及对肌肉增强的反射反应。拉伸幅度增加 20 倍（从 0.1 毫米到 2.0 毫米）导致反射介导的增量刚度减少两倍。尽管与相同幅度（1.0 毫米）的矩形拉伸相比，三角形斜坡拉伸（0.5-5.0 毫米/秒）的内在肌肉硬度增加了一倍，但硬度的净反射分量没有改变。唯一的奇点是使用 10 Hz 扰动观察到的，该频率被认为会引起节段反射环周围的共振。在长时间的肌肉激活过程中，比目鱼肌的内在硬度增强了 32-66%，而反射成分基本没有变化。这些数据表明，在乳头前去大脑中，高尔基腱器官反馈的增益低得可以忽略不计。观察到的反射效应归因于纺锤体 Ia 组和 II 组反馈。
It has recently been proposed that proprioceptive reflexes may regulate muscle stiffness. To test this hypothesis, we have studied the effects of the amplitude, shape and velocity of length perturbations, as well as the reflex response to muscle potentiation, in the soleus muscle of cats decerebrated at the premammillary level. A twenty-fold increase in stretch amplitude (from 0.1 to 2.0 mm) caused a two-fold decrease in the reflex-mediated incremental stiffness. Although the intrinsic muscle stiffness doubled for triangular ramp stretches (0.5–5.0 mm/sec) compared to rectangular stretches of the same amplitude (1.0 mm), the net reflex component of stiffness was unaltered. The only singularity was observed using 10 Hz perturbations, a frequency that was presumed to cause resonance around the segmental reflex loop. The intrinsic stiffness of soleus potentiated by 32–66% during prolonged muscle activation, whereas the reflex component was essentially unchanged. These data suggest that in the premammillary decerebrate the gain of Golgi tendon organ feedback is negligibly low; the observed reflex effects are attributed to spindle group Ia and II feedback.