RECORDING SOUND FROM HUMAN SKELETAL-MUSCLE - TECHNICAL AND PHYSIOLOGICAL-ASPECTS
RECORDING SOUND FROM HUMAN SKELETAL-MUSCLE - TECHNICAL AND PHYSIOLOGICAL-ASPECTS
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DOI：
10.1002/mus.880120207
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发表时间：
1989-02-01
期刊：
影响因子：
3.4
通讯作者：
STERNE, CJ
中科院分区：
文献类型：
--
作者：
BOLTON, CF;PARKES, A;STERNE, CJ
为了研究影响肌肉声音记录的技术因素，我们利用了肌肉的单次抽搐，因为它们的波形很可能是可重复的。我们观察到，无论是ARcher空中接口，还是惠普直接接触传感器，麦克风都可以取得满意的记录。麦克风与皮肤表面的牢固接触和稳定性尤为重要。低于20赫兹（人类听觉范围的下限）的频率必须被记录下来，因为它们至少占肌肉声波能量的90%。主频率低于4赫兹。在腕部正中神经刺激引起的人体大鱼际肌最大抽搐所产生的声波在中心处振幅最大，在肌肉边缘处振幅降至接近零。首先是肌肉复合动作电位，然后是力曲线，用连接在拇指上的应变计记录。在整个时间过程中，声音类似力，并且随着神经刺激强度的增加而增加。然而，它的潜伏期、相位关系和对不同频率神经刺激的反应不同。肌肉声音的一些特征表明，它与抽搐收缩时肌肉的主动收缩成分和平行弹性成分有关，而与串联弹性成分无关。
In order to examine technical factors that influence muscle sound recording, single twitches of muscle were utilized since their waveforms were likely to be reproducible. We observed that satisfactory recordings could be made with either ARcher air interface, or Hewlett-Packard direct contact sensor, microphones. Firm contact and stability between the microphone and the skin surface were particularly important. Frequencies below 20 Hz, the lower limit of the human auditory range, must be recorded, since they account for at least 90% of the power of the muscle sound wave. THe chief frequencies were below 4 Hz. The sound wave produced by a maximal twitch of human thenar muscle induced by median nerve stimulation at the wrist is maximal in amplitude over the center and recedes to near zero at the margins of the muscle. It is preceded by the muscle compound action potential and is followed by the force curve, recorded with a strain gauge attached to the thumb. The sound resembles force in total time course, and it increases with increasing strengths of nerve stimulation. However, it differs in its latency, phase relationships and response to nerve stimulation at different frequencies. Some of the features of muscle sound suggest it relates to both the active contractile and the parallel elastic components of muscle during a twitch contraction, but not the series elastic component.