Gluteus medius: An intramuscular EMG investigation of anterior, middle and posterior segments during gait
Gluteus medius: An intramuscular EMG investigation of anterior, middle and posterior segments during gait
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DOI：
10.1016/j.jelekin.2013.03.007
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发表时间：
2013-08-01
影响因子：
2.5
通讯作者：
Green, Rodney A.
中科院分区：
文献类型：
--
作者：
Semciw, Adam I.;Pizzari, Tania;Green, Rodney A.
先前对臀中肌 (GMed) 的肌电图 (EMG) 研究尚未准确量化所提出的三个结构和功能独特节段（前、中和后）的功能。因此，本研究使用经解剖学验证的位置进行 GMed 三个节段的肌内电极记录，以确定这些节段在功能上是否独立。将双极细线电极插入 15 名健康个体的 GMed 的每个节段中。参与者完成了一系列四项步行试验，然后以五个不同的姿势进行最大自主等长收缩（MVIC）。使用方差分析比较整个步态周期中每个节段的时间和幅度变量。将每个部分对 MVIC 试验的相对贡献与非参数测试进行比较。在步态的站立阶段，所有节段均表现出双相反应。各节段之间的振幅变量 (% MVIC) 没有差异，但前节在第一次和第二次爆发期间都有一个较晚的峰值。对于 MVIC 试验，五个测试位置中的四个的节段之间的振幅存在显着差异。这些数据表明 GMed 由三个功能独立的部分组成。这项研究有助于从理论上理解 GMed 的作用。 (C) 2013 Elsevier Ltd. 保留所有权利。
Previous electromyographic (EMG) studies of gluteus medius (GMed) have not accurately quantified the function of the three proposed structurally and functionally unique segments (anterior, middle and posterior). Therefore this study used anatomically verified locations for intramuscular electrode recordings in three segments of GMed to determine whether the segments are functionally independent. Bipolar fine wire electrodes were inserted into each segment of GMed in 15 healthy individuals. Participants completed a series of four walking trials, followed by maximum voluntary isometric contractions (MVICs) in five different positions. Temporal and amplitude variables for each segment were compared across the gait cycle using ANOVA. The relative contributions of each segment to the MVIC trials were compared with non-parametric tests. All segments showed a biphasic response during the stance phase of gait. There were no differences in amplitude variables (% MVIC) between segments, but the anterior segment had a later peak during both the first and second bursts. For the MVIC trials, there were significant differences in amplitude between segments in four of the five test positions. These data indicate that GMed is composed of three functionally independent segments. This study contributes to the theoretical understanding of the role of GMed. (C) 2013 Elsevier Ltd. All rights reserved.