Computing motor unit number index of the first dorsal interosseous muscle with two different contraction tasks.
Computing motor unit number index of the first dorsal interosseous muscle with two different contraction tasks.
复制标题
DOI：
10.1016/j.medengphy.2012.06.011
复制
发表时间：
2012-10
影响因子：
2.2
通讯作者：
Rymer WZ
中科院分区：
文献类型：
--
作者：
Zhou P;Li X;Rymer WZ
运动单元数指数（MUNIX）是最近发展起来的一种新的神经生理学技术，它提供了与肌肉中运动单元数成比例的指数。MUNIX是由最大M波和自愿表面肌电图（EMG）记录得出的。本研究的目的是解决计算第一背骨间关节（FDI）（一种产生第二掌指关节扭矩的多功能肌肉）的MUNIX的实际问题，即不同的肌肉激活线如何影响其MUNIX估计？为了解决这个问题，在最大M波保持不变的情况下，在15名神经系统完好的受试者的FDI肌上应用了munx技术，分别使用来自食指外展和屈曲的表面肌电信号。在所有受试者中，食指外展时FDI肌的平均MUNIX值为228±45，略小于食指屈曲时FDI肌的平均MUNIX值251±56。不同的FDI肌肉激活模式导致了大约10%的MUNIX估计差异。本研究结果提示，FDI肌的随意激活应保持适当的定义，以确保测量的一致性，避免误差来源。目前的研究仅限于评估神经完整的肌肉。考虑到肌萎缩性侧索硬化症（ALS）是MUNIX方法作为运动单元丧失的潜在随访测量的主要目的，对ALS患者进行类似的分析是很重要的。
Motor unit number index (MUNIX) is a recently developed novel neurophysiological technique providing an index proportional to the number of motor units in a muscle. The MUNIX is derived from maximum M wave and voluntary surface electromyogram (EMG) recordings. The objective of this study was to address a practical question for computing MUNIX in the first dorsal interosseous (FDI), a multifunctional muscle that generates torque about the second metacarpophalangeal joint, i.e. how will different lines of muscle activation influence its MUNIX estimates? To address this question, the MUNIX technique was applied in the FDI muscle of 15 neurologically intact subjects, using surface EMG signals from index finger abduction and flexion, respectively, while the maximum M wave remained the same. Across all subjects, the average MUNIX value of the FDI muscle was 228 ± 45 for index finger abduction, slightly smaller than the MUNIX estimate of 251 ± 56 for index finger flexion. Different FDI muscle activation patterns resulted in an approximately 10% difference in MUNIX estimates. The findings from this study suggest that appropriate definition of voluntary activation of the FDI muscle should be kept to ensure consistency in measurements and avoid source of error. The current study is limited by only assessing neurologically intact muscles. It is important to perform a similar analysis for patients with amyotrophic lateral sclerosis (ALS), given that ALS is the primary intention of the MUNIX method as a potential follow-up measurement for motor unit loss.
登录
查看更多内容
影响因子：
3.4
作者：
Sandberg, Arne;Nandedkar, Sanjeev D.;Stalberg, Erik
通讯作者：
Stalberg, Erik
影响因子：
2.5
作者：
HENNEMAN, E;SOMJEN, G;CARPENTER, DO
通讯作者：
CARPENTER, DO
DOI：
10.1109/titb.2011.2140379
发表时间：
2011-07-01
影响因子：
--
作者：
Li, Xiaoyan;Wang, Ying-Chih;Zhou, Ping
通讯作者：
Zhou, Ping
影响因子：
2.5
作者：
THOMAS, CK;ROSS, BH;STEIN, RB
通讯作者：
STEIN, RB
影响因子：
3.4
作者：
Nandedkar, Sanjeev D.;Barkhaus, Paul E.;Stalberg, Erik V.
通讯作者：
Stalberg, Erik V.