ACOUSTIC MYOGRAPHY - A NONINVASIVE MONITOR OF MOTOR UNIT FATIGUE
ACOUSTIC MYOGRAPHY - A NONINVASIVE MONITOR OF MOTOR UNIT FATIGUE
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DOI：
10.1002/mus.880080303
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发表时间：
1985-01-01
期刊：
影响因子：
3.4
通讯作者：
BALL, RD
中科院分区：
文献类型：
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作者：
BARRY, DT;GEIRINGER, SR;BALL, RD
声学肌电图是记录肌肉收缩时产生的声音。这些声音随着收缩力的增加而变大。我们比较了肌肉的声音与表面肌电图监测分离的电从机械事件（大概，兴奋收缩耦合的损失）发生与运动单位疲劳。使用标准的心音图放大声音信号，记录在FM磁带上，并进行数字分析。在休息、间歇性收缩和持续性收缩时检查肌肉。我们发现，随着疲劳，声振幅衰减，但表面肌电振幅没有。然而，随着努力的减少，声和表面肌电图振幅同时下降。通过同时记录声信号和针肌电图，单独的运动单元被分解为两块肌肉，运动单元的数量减少，运动单元的大小增加。肌束也产生声信号，尽管还没有发现与纤维化相关的声信号。来自肌肉的声学信号的分析提供了一种监测体内运动单元疲劳的非侵入性方法。它也可能有助于区分肌肉疲劳和意志力下降。
Acoustic myography is the recording of sounds produced by contracting muscle. These sounds become louder with increasing force of contraction. We have compared muscle sounds with surface EMG to monitor the dissociation of electrical from mechanical events (presumably, the loss of excitation–contraction coupling) which occur with motor unit fatigue. Acoustic signals were amplified using a standard phonocardiograph, recorded on FM magnetic tape, and digitally analyzed. Muscles were examined at rest, with intermittent contractions, and with sustained contractions. We found that with fatigue, the acoustic amplitude decayed, but the surface EMG amplitude did not. With decreased effort, however, the acoustic and the surface EMG amplitudes declined simultaneously. By simultaneously recording acoustic signals and needle EMG, individual motor units were resolved acoustically in two muscles with decreased numbers of motor units and increased motor unit size. Fasciculations also produced acoustic signals, although no acoustic signal has yet been found that correlates with fibrillations. Analysis of acoustic signals from muscle provides a noninvasive method for monitoring motor unit fatigue in vivo. It may also be useful in distinguishing muscle fatigue from decreased volition.