Myoelectric activity along human gastrocnemius medialis: different spatial distributions of postural and electrically elicited surface potentials.
Myoelectric activity along human gastrocnemius medialis: different spatial distributions of postural and electrically elicited surface potentials.
复制标题
DOI：
10.1016/j.jelekin.2012.08.003
复制
发表时间：
2013-02
影响因子：
2.5
通讯作者：
Vieira, Taian M. M.
中科院分区：
文献类型：
--
作者：
Hodson-Tole, Emma F.;Loram, Ian D.;Vieira, Taian M. M.
关键词：
最近的研究表明，人体内侧腓肠肌(MG)的运动单位在站立时被激活，沿着肌肉的纵轴占据相对较小的区域。这样的组织为不同的运动任务提供了潜力，以产生不同的区域活动模式。在这里，我们研究姿势控制和神经电刺激是否在MG患者产生相同的纵向激活模式。使用线性电极阵列记录MG不同近端-远端位置的肌电活动。为了确保经络之间的信号幅度差异不是由局部的形态因素引起的，完成了两个实验方案：(I)安静站立；(Ii)电刺激胫神经。在每种情况下计算每个通道的平均整流值(ARV)。信号沿电极通道的分布用线性回归来描述，每个通道上的方案之间的差异被确定为站立：刺激方案的平均ARV之间的比率。在7名(8名)受试者中，电极通道的比值发生了系统性的变化，远端通道的比值更大。因此，ARV在MG上的分布在不同的实验条件下是不同的。与刺激MG神经时激活的单位的纤维相比，站立时激活的单位在远端肌肉部分可能有更高的代表性。
It has recently been shown that motor units in human medial gastrocnemius (MG), activated during standing, occupy relatively small territories along the muscle’s longitudinal axis. Such organisation provides potential for different motor tasks to produce differing regional patterns of activity. Here, we investigate whether postural control and nerve electrical stimulation produce equal longitudinal activation patterns in MG. Myoelectric activity, at different proximal–distal locations of MG, was recorded using a linear electrode array. To ensure differences in signal amplitude between channels did not result from local, morphological factors two experimental protocols were completed: (i) quiet standing; (ii) electrical stimulation of the tibial nerve. Averaged, rectified values (ARVs) were calculated for each channel in each condition. The distribution of signals along electrode channels was described using linear regression and differences between protocols at each channel determined as the ratio between mean ARV from standing: stimulation protocols. Ratio values changed systematically across electrode channels in seven (of eight) participants, with larger values in distal channels. The distribution of ARV along MG therefore differed between experimental conditions. Compared to fibres of units activated during MG nerve stimulation, units activated during standing may have a tendency to be more highly represented in the distal muscle portion.
登录
查看更多内容
影响因子：
4.6
作者：
MCNEAL, DR
通讯作者：
MCNEAL, DR
影响因子：
4.7
作者：
Hennings, Kristian;Kamavuako, Ernest Nlandu;Farina, Dario
通讯作者：
Farina, Dario
影响因子：
3.3
作者：
Higham, Timothy E.;Biewener, Andrew A.;Wakeling, James M.
通讯作者：
Wakeling, James M.
DOI：
10.1523/jneurosci.1013-11.2011
发表时间：
2011-10-19
期刊：
The Journal of neuroscience : the official journal of the Society for Neuroscience
影响因子：
--
作者：
Kiemel T;Zhang Y;Jeka JJ
通讯作者：
Jeka JJ
影响因子：
5.3
作者：
WEEKS, OI;ENGLISH, AW
通讯作者：
ENGLISH, AW