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首页> 外文期刊>Journal of Neurophysiology >Factors affecting the common modulation of bilateral motor unit discharge in human soleus muscles.
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Factors affecting the common modulation of bilateral motor unit discharge in human soleus muscles.

机译：影响人比目鱼肌中双侧运动单位放电共同调节的因素。

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The purpose of this study was to determine the factors that influence the co-modulation of motor unit discharge rate in soleus muscles of both legs during upright standing. Single motor units were recorded from the left and right soleus muscles under three experimental conditions: standing quietly with the eyes open and closed, standing with the eyes closed while vibration was applied to one Achilles tendon, and swaying voluntarily or producing variable low-force isometric contractions at a frequency of 0.05 Hz. Correlations in motor unit discharge rate between left and right soleus motor units were assessed using common drive analysis. The results showed that common drive to motoneurons of the two muscles did not differ between standing with the eyes open or closed, but there was an order effect with the second task having significantly lower common drive than the first. Common drive was also significantly lower when vibration was applied to one leg compared with when no vibration was applied. Common drive was higher as subjects swayed anteriorly as compared with when they swayed posteriorly. There were no significant differences in common drive across phases of the variable isometric force contraction. Common drive was higher during voluntary sway than during variable force production; both of these values were significantly lower than those derived from the quiet standing task. These results suggest that proprioceptive and sub-cortical inputs contribute to the co-modulation of the firing rate of soleus motor unit pairs of the left and right leg during standing posture.
机译：这项研究的目的是确定在直立站立期间影响双腿比目鱼肌运动单位放电速率的共调节的因素。在以下三个实验条件下记录左右比目鱼肌的单个运动单位：安静地睁开双眼，闭眼站立，同时对一只跟腱施加振动，自动摇摆或产生可变的低力等距收缩频率为0.05 Hz。使用通用驱动器分析评估左右比目鱼比目鱼运动单元之间运动单元放电率的相关性。结果表明，睁开眼睛或闭眼站立时，两种肌肉对运动神经元的共同驱动力没有差异，但是第二种任务的顺序驱动力明显低于第一种任务，因此具有顺序效应。与没有施加振动的情况相比，当对一条腿施加振动时，普通驱动力也显着降低。与对象向后摇动相比，受试者向前摇动的共同驱动力更高。等轴测力收缩各阶段的共同驱动力没有显着差异。主动摇摆时的共同驱动力要比可变力生产时的高。这两个值均显着低于安静任务所得出的值。这些结果表明，在站立姿势期间，本体感受和皮层下输入有助于左腿和右腿的比目鱼运动单元对的放电速率的共调制。

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