Task-related changes of transmission in the pathway of heteronymous spinal recurrent inhibition from soleus to quadriceps motor neurones in man.
Task-related changes of transmission in the pathway of heteronymous spinal recurrent inhibition from soleus to quadriceps motor neurones in man.
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人类从比目鱼肌到股四头肌运动神经元的异同脊髓循环抑制通路中的传递的任务相关变化。
DOI：
10.1093/brain/123.11.2264
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
J. Pardoe
中科院分区：
文献类型：
--
作者：
J. Iles;A. Ali;J. Pardoe
采用H反射条件反射技术，观察了人下肢比目鱼肌向股四头肌运动神经元传递异源性反复抑制的情况。抑制下降，在股四头肌收缩在所有条件下检查，下降到零，约三分之一的最大自愿收缩。抑制下降比目鱼肌收缩坐着，站着和骑自行车的任务。与坐着和进行匹配的自愿肌肉收缩相比，在涉及四头肌和比目鱼肌共同收缩（站立和行走的后期站立阶段）的姿势任务期间，在给定的四头肌收缩水平（低于30%）下评估的抑制水平降低。在中等功率中风的骑自行车的任务，其中还涉及四头肌和比目鱼肌的共同收缩，抑制的水平大于在匹配的自愿肌肉收缩，而坐着。它的结论是，从比目鱼肌到四头肌运动神经元的heteropathy复发抑制的途径是根据至少两种类型的控制：一个相关的任务，它设置的操作范围，和第二个耦合抑制肌肉收缩的水平。多种控制途径与上运动神经元病变受试者报告的复发性抑制的不同影响一致。
An H reflex conditioning technique was used to monitor the transmission of heteronymous recurrent inhibition from soleus to quadriceps motor neurones of the human lower limb. Inhibition declined during quadriceps muscle contraction under all conditions examined, falling to zero at around one-third of the maximum voluntary contraction. Inhibition declined during soleus muscle contraction in sitting, standing and bicycling tasks. The level of inhibition assessed at a given (weaker than 30%) level of quadriceps contraction was reduced during postural tasks involving quadriceps and soleus co-contraction (standing and late-stance phase of walking) when compared with sitting and performing matched voluntary muscle contractions. The level of inhibition during the mid-power stroke of a bicycling task, which also involved co-contraction of quadriceps and soleus, was greater than during matched voluntary muscle contractions while sitting. It is concluded that the pathway of heteronymous recurrent inhibition from soleus to quadriceps motor neurones is under at least two types of control: one related to the task, which sets the operating range, and a second which couples inhibition to the level of muscle contraction. Multiple control pathways are consistent with the diverse effects on recurrent inhibition reported in subjects with upper motor neurone lesions.