Acoustic myography during voluntary isometric contraction reveals non-propagative lateral vibration.
Acoustic myography during voluntary isometric contraction reveals non-propagative lateral vibration.
复制标题
自主等长收缩期间的声学肌动描记术揭示了非传播的横向振动。
DOI：
10.1016/s0021-9290(99)00132-3
复制
发表时间：
1999
影响因子：
2.4
通讯作者：
A. Salès
中科院分区：
文献类型：
--
作者：
M. Ouamer;M. Boiteux;M. Petitjean;L. Travens;A. Salès
当在体外抽搐期间诱发孤立肌肉同步收缩时，肌肉表面的机械振动反映共振行为。相反，自主收缩对应于募集运动单位的异步收缩，因此，这种兴奋可能导致不同的肌肉振动行为。我们对10名健康人肱二头肌进行了随意收缩的研究。低水平和高水平的自主收缩进行了探讨，同时记录表面振动的两个传感器位于纵向或垂直于肌肉的主轴。计算了互相关函数和相干函数。相干函数揭示了一个共同的振动频带之间的17和28赫兹。互相关函数揭示了纵向传感器的同相振动和垂直传感器的反相振动，从而证实了横向弯曲运动。这种行为表明，声学肌电图是肌肉作为一个整体共振结构对局部压力波动的反应。
When isolated muscle synchronous contraction is evoked during in vitro twitches, mechanical vibrations at the surface of the muscle reflect resonant behavior. In contrast, voluntary contraction corresponds to the asynchronous contraction of recruited motor units, therefore, this kind of excitation could lead to different muscle vibrational behavior. We have studied human biceps brachii muscle during voluntary contraction in 10 healthy subjects. Low and high levels of voluntary contraction were explored with simultaneous recording of surface vibration by two sensors located longitudinally or perpendicular to the muscle's main axis. Cross-correlation and coherence functions were computed. Coherence functions revealed a common vibration frequency band between 17 and 28Hz. Cross correlation functions revealed in-phase vibration for longitudinal sensors and opposite phase vibration for perpendicular sensors thus confirming a lateral bending movement. This behavior suggests that the acoustic myogram is the response of the muscle as a global resonant structure to the local fluctuations of pressure.