Greater movement-related cortical potential during human eccentric versus concentric muscle contractions
Greater movement-related cortical potential during human eccentric versus concentric muscle contractions
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DOI：
10.1152/jn.2001.86.4.1764
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发表时间：
2001-10-01
影响因子：
2.5
通讯作者：
Yue, GH
中科院分区：
文献类型：
--
作者：
Fang, Y;Siemionow, V;Yue, GH
尽管有大量的证据表明，不同的神经系统控制策略可能存在人类的同心和偏心肌肉收缩，没有数据表明，大脑信号不同的偏心与同心肌肉动作。本研究的目的是评估脑电图（EEG）衍生的运动相关皮层电位（MRCP），并确定MRCP测量的皮层激活水平是否在两种类型的肌肉活动之间存在差异。八名健康受试者进行了50个自愿离心和50个自愿同心肘屈肌收缩对负荷等于10%的体重。表面EEG信号从四个头皮位置覆盖感觉运动相关的皮层区域在额叶和顶叶测量沿着与动力学和运动学信息的肌肉和关节。MRCP是从离心和向心性肌肉收缩的EEG信号中提取的。尽管偏心动作期间手肘屈肌激活（EMG）低于同心动作，但MRCP的两个主要成分（一个与运动计划和执行相关，另一个与来自外周系统的反馈信号相关）的振幅显着更大偏心比同心动作。离心任务的MRCP起始时间早于同心任务。偏心肌肉动作的皮层信号更大，这表明大脑可能计划和编程偏心运动不同于同心肌肉任务。
Despite abundant evidence that different nervous system control strategies may exist for human concentric and eccentric muscle contractions, no data are available to indicate that the brain signal differs for eccentric versus concentric muscle actions. The purpose of this study was to evaluate electroencephalography (EEG)-derived movement-related cortical potential (MRCP) and to determine whether the level of MRCP-measured cortical activation differs between the two types of muscle activities. Eight healthy subjects performed 50 voluntary eccentric and 50 voluntary concentric elbow flexor contractions against a load equal to 10% body weight. Surface EEG signals from four scalp locations overlying sensorimotor-related cortical areas in the frontal and parietal lobes were measured along with kinetic and kinematic information from the muscle and joint. MRCP was derived from the EEG signals of the eccentric and concentric muscle contractions. Although the elbow flexor muscle activation (EMG) was lower during eccentric than concentric actions, the amplitude of two major MRCP components-one related to movement planning and execution and the other associated with feedback signals from the peripheral systems-was significantly greater for eccentric than for concentric actions. The MRCP onset time for the eccentric task occurred earlier than that for the concentric task. The greater cortical signal for eccentric muscle actions suggests that the brain probably plans and programs eccentric movements differently from concentric muscle tasks.