Reliability and laterality of the soleus H-reflex following galvanic vestibular stimulation in healthy individuals
Reliability and laterality of the soleus H-reflex following galvanic vestibular stimulation in healthy individuals
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DOI：
10.1016/j.neulet.2021.135910
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发表时间：
2021-04-28
影响因子：
2.5
通讯作者：
Shomoto, Koji
中科院分区：
文献类型：
--
作者：
Nakamura, Junji;Okada, Yohei;Shomoto, Koji
前庭脊髓束（VST）在控制同侧反重力肌中起重要作用，左右VST兴奋性的平衡在人体姿势控制中起重要作用。测量VST兴奋性的方法是在胫神经刺激之前应用前庭电刺激（GVS），引起比目鱼肌H反射;然后评估H反射幅度的变化率。VST兴奋性和左右平衡的评估可能是有用的，当确定干预姿势控制障碍的病理。然而，这种评估的可靠性和偏侧性尚未得到澄清，也没有它的关系，姿势控制。我们调查的可靠性，偏侧性和站立姿势控制的促进程度的H-反射以下GVS在15名健康成人。评估分两次进行，左侧和右侧各一次，随机顺序。对两侧GVS后H反射增加的短间隔评估的会话间可靠性是足够的。GVS的H反射易化程度在任何会话中的左侧和右侧之间均无显著差异。闭眼站立泡沫条件下压力中心的中外侧位置与第一次会议中H反射增加程度的左/右比率之间存在中度正相关。我们的结论是，这种评估GVS后比目鱼肌H反射增加的方法在短时间内具有很高的会话间可靠性，两侧之间没有差异。
The vestibulospinal tract (VST) plays an important role in the control of the ipsilateral antigravity muscles, and the balance of left and right VST excitability is important in human postural control. A method for measuring VST excitability is the application of galvanic vestibular stimulation (GVS) before tibial nerve stimulation that evokes the soleus H-reflex; the change rate of the H-reflex amplitude is then evaluated. Assessments of VST excitability and the left and right balance could be useful when determining the pathology for interventions in postural control impairments. However, the reliability and laterality of this assessment have not been clarified, nor has its relationship to postural control. We investigated the reliability, laterality and standing postural control in relation to the degree of facilitation of the H-reflex following GVS in 15 healthy adults. The assessments were performed in two sessions, one each for the left- and right-sides, in random order. The inter-session reliability of the short-interval assessments of an increase in the H-reflex following GVS on both sides were sufficient. The degree of H-reflex facilitation by GVS showed no significant difference between the left- and rightsides in any session. There was a moderate positive correlation between the mediolateral position of the center of pressure in the eyes-closed standing on foam condition and the left/right ratio of the degree of increased H-reflex in the first-session. We concluded that this method for evaluating the increase in the soleus H-reflex following GVS has high inter-session reliability in the short-interval that did not differ between sides.