Movement related cortical potentials for postural adjustment against upper extremity perturbation

针对上肢扰动进行姿势调整的运动相关皮层电位

• 批准号: 16500354
• 负责人: OTA Tetsuo
• 金额: $ 2.05万
• 依托单位: Keio University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16500354/
• 关键词: movement related cortical Potentials; postural adjustment; fall; 姿勢調節; 転倒予防

Rapid arm movements generate balance perturbations, which are anticipated and counteracted by postural adjustments. These adjustments caused by trunk and lower extremities muscles to maintain body balance are called anticipatory postural adjustments (APAs). We investigated movement related cortical potentials (MRCPs) corresponded to APAs and compared degree of MRCPs negativity in the different situations for example standing on the floor, standing on unstable board, standing on one foot and sitting with and without seat back. The electromyography(EMG) of the arm-movement prime mover and electroencephalography(EEG) on C3, Cz, C4 were recorded with surface electrode. EEG signals collected for a period of 2s prior to the prime mover EMG onset and 1s after that. We identified the Bereitshaftspotential(BP) and motor potentials(MP) and then calculated the difference of negativity between MP and BP as cerebral cortical activity possibly corresponded to APAs.Results and discussion : The amplitude of BP and MP were higher detected at Cz than at C3 and C4. The difference of negativity between MP and BP detected at Cz was significantly large in the stable situation for example standing on the floor and sitting on the seat. We couldn't see the difference between MP and BP in the unstable situation like one foot standing and standing on unstable board. Several studies reported that APAs also unclear in the unstable situation like that. So this MRCPs might indicate cerebral cortical activity corresponded to APAs. If it is true, we may be able to predict the risk of fall by measuring this MRCPs. Because disappear of this MRCPs may indicate the failure of mechanism maintaining one's body balance.

手臂的快速运动会产生平衡扰动，这是可以预见的，并通过姿势调整来抵消。这些由躯干和下肢肌肉引起的维持身体平衡的调整被称为预期姿势调整（APA）。我们研究了运动相关皮层电位（MRCPs）对应的APA，并比较了不同情况下，如站在地板上，站在不稳定的板，单脚站立和坐在有和没有座椅靠背的MRCPs负性的程度。用表面电极记录手臂运动原动机的肌电图和C3、Cz、C4的脑电图。在原动机EMG开始之前2s和之后1s的时间段内收集EEG信号。我们确定了Bereitshaftpotential（BP）和motor potential（MP），然后计算MP和BP之间的负性差异，因为大脑皮层活动可能对应于APAs.Results和讨论：在Cz检测到的BP和MP幅度高于C3和C4。在稳定的情况下，例如站在地板上和坐在座位上，在Cz处检测到的MP和BP之间的负性差异显著较大。在单脚站立和站立在不稳定的木板上的不稳定情况下，我们看不到MP和BP的差异。几项研究报告说，自适应天线也不清楚在不稳定的情况下，这样的。因此，MRCP可能表明大脑皮层活动对应于APA。如果这是真的，我们可以通过测量MRCP来预测跌倒的风险。因为MRCP的消失可能表明维持机体平衡的机制失效。