北京体育大学学报
北京體育大學學報
북경체육대학학보
Journal of Beijing University of Physical Education
2015年
3期
72~77
,共null页
屈指运动 大脑运动皮质区 运动相关电位 辅助运动区
屈指運動 大腦運動皮質區 運動相關電位 輔助運動區
굴지운동 대뇌운동피질구 운동상관전위 보조운동구
movement of finger flexion motor area of cerebral cortex movement-related cortical potentials（MRCPs） supplementary motor area（SMA）
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。
目的：觀察上肢手指屈指運動誘髮的大腦運動皮質區的運動相關電位（movement-related cortical potentials,MRCPs）的形態以及分佈特徵。方法：以13名健康受試者為研究對象,讓其右手手指執行100次30%MVC的間斷性地握力收縮,同時測量受試者連續的腦電信號和肌力信號。以肌電激活觸髮點為事件相關點,利用平均疊加法提取齣運動事件相關電位。結果：MRCPs電位呈現緩慢上升然後緩慢下降的負性電位,主要分佈在運動皮質區（輔助運動區、初級運動區）,左右大腦半毬非對稱分佈,運動對側大腦半毬的電位幅值顯著高于運動同側大腦半毬（P〈0.01）。MRCPs峰值電位齣現在大腦中線輔助運動區的FCz和Cz位置。結論：指屈肌次最大隨意等長收縮誘髮的MRCPs電位呈現一種先上升後下降的非線性變化特徵,其空間分佈樣式更加靠近大腦運動對側半毬的內側。另外,MRCPs電位主要反映運動前準備和運動觸髮時的中樞命令,但無法反映動作持續階段的中樞命令。
목적：관찰상지수지굴지운동유발적대뇌운동피질구적운동상관전위（movement-related cortical potentials,MRCPs）적형태이급분포특정。방법：이13명건강수시자위연구대상,양기우수수지집행100차30%MVC적간단성지악력수축,동시측량수시자련속적뇌전신호화기력신호。이기전격활촉발점위사건상관점,이용평균첩가법제취출운동사건상관전위。결과：MRCPs전위정현완만상승연후완만하강적부성전위,주요분포재운동피질구（보조운동구、초급운동구）,좌우대뇌반구비대칭분포,운동대측대뇌반구적전위폭치현저고우운동동측대뇌반구（P〈0.01）。MRCPs봉치전위출현재대뇌중선보조운동구적FCz화Cz위치。결론：지굴기차최대수의등장수축유발적MRCPs전위정현일충선상승후하강적비선성변화특정,기공간분포양식경가고근대뇌운동대측반구적내측。령외,MRCPs전위주요반영운동전준비화운동촉발시적중추명령,단무법반영동작지속계단적중추명령。
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.
