Influence of voluntary teeth clenching on the stabilization of postural stance disturbed by electrical stimulation of unilateral lower limb
Influence of voluntary teeth clenching on the stabilization of postural stance disturbed by electrical stimulation of unilateral lower limb
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DOI：
10.1016/j.gaitpost.2009.09.010
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发表时间：
2010-01-01
期刊：
影响因子：
2.4
通讯作者：
Ueno, Toshiaki
中科院分区：
文献类型：
--
作者：
Fujino, Sachiko;Takahashi, Toshiyuki;Ueno, Toshiaki
有关牙齿咬合与身体平衡关系的研究表明，咬合状态有助于维持姿势平衡。然而，很少有报道的影响，自愿咬牙稳定的姿势站在新的环境。在本研究中，我们研究了磨牙是否影响对单侧下肢电刺激引入的扰动的适应。受试者（12名成年人）站在一个力板上，从中获得运动数据，在水平面上有和没有自愿咬牙，并指示在整个实验中保持位置。我们诱发了一个新的环境，通过超大经皮电刺激腓总神经。采用双极表面杯状电极记录咬肌和腓骨长肌的肌电图。当电刺激产生干扰姿势时，有磨牙（CL）时前后（A/P）方向的最大反作用力显著小于无磨牙时（控制; CO）（p < 0.05），且CL条件下A/P方向的地面反作用力/体重（GRF/BM）峰值出现时间早于CO条件下（p < 0.05）。在CL和CO条件下，在M/L方向上，GRF/BM的峰-峰幅度和GRF/BM的峰值时间没有显著差异。因此，本研究表明，自愿咬牙有助于稳定的姿势姿态短暂扰动的电刺激。我们的结论是，自愿咬紧牙关起着重要的作用，在快速姿势适应的前后扰动在直立位置。(C)2009年由Elsevier B出版。诉
Studies on the relationship between dental occlusion and body balance have suggested that occlusion status contributes to the maintenance of postural balance. However, little has been reported about the effects of voluntary teeth clenching on the stabilization of postural stance in novel environments. In the present study we investigated whether teeth clenching influenced adaptation to the perturbation introduced by electrical stimulation of a unilateral lower limb. Subjects (12 adults) stood on a force plate, from which motion data were obtained in the horizontal plane with and without voluntary teeth clenching and were instructed to maintain the position throughout the experiment. We evoked a novel environment by supramaximal percutaneous electrical stimulation of the common peroneal nerve. Electromyograms (EMG) were recorded from the masseter and the peroneus longus (PL) muscles with bipolar surface cup electrodes. When the disturbed postural stance was generated by electrical stimulation, the maximum reaction force in the anterior-posterior (A/P) direction with teeth clenching (CL) was significantly smaller than that without voluntary teeth clenching (control; CO) (p < 0.05) and the peak time of the ground reaction force/body mass (GRF/BM) in the A/P direction occurred earlier in the CL condition than CO (p < 0.05). There were no significant differences in the peak-to-peak amplitude of GRF/BM and the peak time of GRF/BM, in the M/L direction under both CL and CO conditions.Thus, the present study showed that voluntary teeth clenching contributed to stabilization of the postural stance perturbed transiently by electrical stimulation. We concluded that voluntary teeth clenching plays an important role in rapid postural adaptation to the anterior-posterior perturbation in the upright position. (C) 2009 Published by Elsevier B. V.