Posture influences on vestibulospinal tract excitability
Posture influences on vestibulospinal tract excitability
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姿势对前庭脊髓束兴奋性的影响
DOI：
10.1007/s00221-021-06033-8
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发表时间：
2021
影响因子：
2
通讯作者：
Okada Yohei
中科院分区：
文献类型：
--
作者：
Tanaka Hiroaki;Nakamura Junji;Siozaki Tomoyuki;Ueta Kozo;Morioka Shu;Shomoto Koji;Okada Yohei
人类前庭脊髓束在姿势控制中具有重要作用，但前庭脊髓束兴奋性是否受身体姿势的影响尚不清楚。我们通过一种神经生理学方法研究了体位对前庭脊髓束兴奋性的影响，即在刺激比目鱼肌H反射之前对胫神经刺激100ms进行电刺激。GVS是一种经皮刺激，GVS的皮肤输入如何影响阴极GVS对比目鱼肌H反射幅度的易化作用尚不清楚。在实验一中，我们以随机顺序评估了GVS对被试俯卧、仰卧和坐姿比目鱼肌H反射幅度的影响，以阐明GVS效应在这三种姿势中的差异。在实验2中，为了确定仰卧位和坐位GVS的影响是否完全由GVS的皮肤输入引起，我们提供了GVS和皮肤刺激作为条件性刺激，并比较了两种姿势下的效果。在两个实验中都观察到了姿势和刺激条件之间的交互作用。坐位GVS对最大H反射幅度的易化率显著高于俯卧位和仰卧位(实验1)。坐位时GVS的促进率显著大于皮肤刺激(实验2)。这些结果表明，坐位的前庭脊髓束兴奋性可能高于任何一种卧位(俯卧位和仰卧位)，这主要是由于对姿势控制的需求增加。
The human vestibulospinal tract has important roles in postural control, but it has been unknown whether vestibulospinal tract excitability is influenced by the body's postures. We investigated whether postures influence the vestibulospinal tract excitability by a neurophysiological method, i.e., applying galvanic vestibular stimulation (GVS) 100 ms before tibial nerve stimulation evoking the soleus H-reflex. GVS is a percutaneous stimulation, and it has not been clarified how the cutaneous input from GVS influences the facilitation effect of cathodal GVS on the soleus H-reflex amplitude. In Experiment 1, we evaluated the effects of GVS on the soleus H-reflex amplitude of subjects in the prone, supine, and sitting positions in random order to clarify the differences in the GVS effects among these postures. In Experiment 2, to determine whether the effects of GVS in the supine and sitting positions are due solely to cutaneous input from GVS, we provided GVS and cutaneous stimulations as conditioning stimuli and compared the effects in both postures. Interaction effects between postures and stimulus conditions were observed in both experiments. The facilitation rate of the maximum H-reflex amplitude by GVS in the sitting position was significantly higher than those in the prone and supine positions (Experiment 1). The facilitation rate of GVS was significantly larger than the cutaneous stimulation only in the sitting position (Experiment 2). These results indicate that vestibulospinal tract excitability may be higher in the sitting position than in either lying position (prone and supine), due mainly to the increased need for postural control.
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