The influence of electrode placement over the innervation zone on electromyographic amplitude and mean power frequency versus isokinetic torque relationships
The influence of electrode placement over the innervation zone on electromyographic amplitude and mean power frequency versus isokinetic torque relationships
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DOI：
10.1016/j.jneumeth.2006.12.009
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发表时间：
2007-05-15
影响因子：
3
通讯作者：
Johnson, Glen O.
中科院分区：
文献类型：
--
作者：
Beck, Travis W.;Housh, Terry J.;Johnson, Glen O.
本研究的目的是检查电极放置在股外侧肌的估计神经支配区 (IZ) 以及估计 IZ 的近端和远端对腿部伸肌的向心和偏心等速肌肉动作期间肌电 (EMG) 振幅和平均功率频率 (MPF) 的扭矩相关模式的影响。 11 名男子以 10% 的增量从 10% 到 90% 峰值扭矩 (PT) 进行随机排序、次最大到最大同心和偏心等速肌肉动作。通过放置在估计 IZ 上以及估计 IZ 的近端和远端的双极电极布置，同时记录来自股外侧肌的表面 EMG 信号。结果表明，近端、IZ 和远端电极放置部位之间的绝对和归一化 EMG 振幅和 MPF 与扭矩的响应模式，或平均绝对和归一化 EMG 振幅和 MPF 值的响应模式没有一致的差异。因此，这些发现表明，在腿部伸肌的向心和偏心等速肌肉动作期间，将电极放置在股外侧肌的估计 IZ 上对绝对和归一化 EMG 振幅以及 MPF 与扭矩的响应模式或平均值没有影响。 (C) 2007 Elsevier B.V. 保留所有权利。
The purpose of this investigation was to examine the influence of electrode placement over the estimated innervation zone (IZ) for the vastus lateralis, as well as proximal and distal to the estimated IZ, on the torque-related patterns for electromyographic (EMG) amplitude and mean power frequency (MPF) during concentric and eccentric isokinetic muscle actions of the leg extensors. Eleven men performed randomly ordered, submaximal to maximal concentric and eccentric isokinetic muscle actions of the dominant leg extensors in 10% increments from 10 to 90% peak torque (PT). Surface EMG signals were recorded simultaneously from the vastus lateralis muscle with bipolar electrode arrangements placed over the estimated IZ, as well as proximal and distal to the estimated IZ. The results indicated that there were no consistent differences among the proximal, IZ, and distal electrode placement sites for the patterns of responses for absolute and normalized EMG amplitude and MPF versus torque, or the mean absolute and normalized EMG amplitude and MPF values. Thus, these findings suggested that during concentric and eccentric isokinetic muscle actions of the leg extensors, electrode placement over the estimated IZ for the vastus lateralis had no effect on the patterns of responses or mean values for absolute and normalized EMG amplitude and MPF versus torque. (C) 2007 Elsevier B.V. All rights reserved.