手指屈指运动诱发大脑运动皮质区运动相关电位研究被引量：7

Movement-Related Cortical Potentials(MRCPs) in Motor Area of Cerebral Cortex Induced by Movement of Finger Flexion

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摘要目的:观察上肢手指屈指运动诱发的大脑运动皮质区的运动相关电位(movement-related cortical potentials,MRCPs)的形态以及分布特征。方法:以13名健康受试者为研究对象,让其右手手指执行100次30%MVC的间断性地握力收缩,同时测量受试者连续的脑电信号和肌力信号。以肌电激活触发点为事件相关点,利用平均叠加法提取出运动事件相关电位。结果:MRCPs电位呈现缓慢上升然后缓慢下降的负性电位,主要分布在运动皮质区(辅助运动区、初级运动区),左右大脑半球非对称分布,运动对侧大脑半球的电位幅值显著高于运动同侧大脑半球(P<0.01)。MRCPs峰值电位出现在大脑中线辅助运动区的FCz和Cz位置。结论:指屈肌次最大随意等长收缩诱发的MRCPs电位呈现一种先上升后下降的非线性变化特征,其空间分布样式更加靠近大脑运动对侧半球的内侧。另外,MRCPs电位主要反映运动前准备和运动触发时的中枢命令,但无法反映动作持续阶段的中枢命令。 Objective： This study observed characteristics of shape and distribution of movement-related cortical potentials（MRCPs） in Motor Area of Cerebral Cortex induced by movement of figure flexion. Methods： Thirteen healthy subjects were screened as subjects,their right fingers were asked to do 100 intermittent contractions of30% MVC,and their continuous electroencephalography（EEG） and force signals were collected. The MRCPs was distracted by the average superposition method when the trigger point of surface electromyography was seemed as movement-related point. Results： The MRCPs were negative,they increased slowly at the beginning and then slowly decreased,and they mainly distributed in motor area of cerebral cortex（supplementary motor area（SMA） and primary motor area） but non-symmetrically distributed in left and right cerebral hemispheres. The amplitudes of MRCPs in contralateral hemisphere of movement were significantly higher than those in ipsilateral hemisphere of movement（P〈0. 01）. The peak value of MRCPs occurred on FCz and Cz sites of SMA in the midline of brain. Conclusions： MRCPs induced by sub-maximum voluntary isometric contraction of finger flexor show a nonlinear change that increases at the beginning and then decreases,and they mainly locate in medial part of contralateral hemisphere of movement. In addition,the MRCPs reflect the central commands related to preparatory process and execution of movement rather than sustainable phase of movement.

作者郭峰张日辉

机构地区沈阳体育学院运动人体科学学院

出处《北京体育大学学报》 CSSCI 北大核心 2015年第3期72-77,共6页 Journal of Beijing Sport University

基金国家自然科学基金(编号:31371046) 辽宁省教育厅一般科学研究项目(编号:L2012412)

关键词屈指运动大脑运动皮质区运动相关电位辅助运动区 movement of finger flexion motor area of cerebral cortex movement-related cortical potentials（MRCPs） supplementary motor area（SMA）

分类号 G804.2 [文化科学—运动人体科学]

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