Human muscle hardness assessment during incremental isometric contraction using transient elastography
Human muscle hardness assessment during incremental isometric contraction using transient elastography
复制标题
DOI：
10.1016/j.jbiomech.2004.07.013
复制
发表时间：
2005-07-01
影响因子：
2.4
通讯作者：
Portero, P
中科院分区：
文献类型：
--
作者：
Gennisson, JL;Cornu, C;Portero, P
本研究的目的是通过量化表面肌电信号 (sEMG) 来研究使用瞬态弹性成像技术的肱二头肌硬度与其活动水平之间的关系。十名健康受试者自愿参加该方案。为了评估最大肱二头肌肌电活动 (sEMG-RMSm)，受试者必须在肘部屈曲过程中完成最大自主收缩试验。然后，他们被要求在 120 秒内进行肘部屈曲从 0% 到 50% sEMG-RMSm 的等长二头肌 sEMG-RMS 斜坡试验。在所有试验期间，由先前放置在肱二头肌腹部的创新剪切弹性探针每 5 秒发送一次低频脉冲，以便计算横向剪切模量。本研究的主要结果是（i）发现肱二头肌横向剪切模量与相应的 sEMG-RMS 值之间存在系统的线性关系。当绘制横向剪切模量与肘部弯曲扭矩产生的关系时，情况并非如此。因此，可以根据各个横向剪切模量-sEMG-RMS线性关系的斜率计算硬度指数； (ii)还发现，静止剪切模量越高，硬度指数越低，这表明收缩过程中横向剪切模量的变化取决于其静止时的水平。因此，这种非侵入性技术可用于医学领域，以探索传统测试方法无法到达的深层肌肉。它还可以应用于引起僵硬变化的神经肌肉疾病的随访，例如杜氏肌营养不良症。 (c) 2004 年，爱思唯尔有限公司出版。
The aim of this study was to investigate the relationship between biceps brachii hardness using the transient elastography technique, and its activity level by quantifying the surface electromyographic signal (sEMG). Ten healthy subjects volunteered for this protocol. To assess the maximal biceps brachii myoelectric activity (sEMG-RMSm), subjects had to achieve their maximal voluntary contraction trial during an elbow flexion effort. They were then asked to perform an isometric biceps sEMG-RMS ramp trial in elbow flexion from 0% to 50% of their sEMG-RMSm in 120 s. A low-frequency pulse was sent every 5 s during all trials by an innovative shear elasticity probe previously placed over the belly of the biceps brachii allowing the calculation of a transverse shear modulus. The main results of this study were (i) the finding of a systematic linear relationship between the biceps brachii transverse shear moduli and the corresponding sEMG-RMS values. This was not the case when plotting transverse shear modulus versus the elbow flexion torque production. Therefore, the computation of a hardness index from the slope of individual transverse shear modulus-sEMG-RMS linear relationship was enabled; (ii) It was also found that the higher is the rest shear modulus, the lower is the hardness index, indicating that the transverse shear modulus change during contraction depends on its level at rest. Therefore, this non-invasive technique could be useful in the medical field to explore deep muscles which are unreachable by classical testing methods. It could also be applied for the follow-up of neuromuscular diseases inducing stiffness changes such as in Duchenne muscular dystrophy. (c) 2004 Published by Elsevier Ltd.