来自人体骨骼肌持续收缩的低频声音。
Low frequency sounds from sustained contraction of human skeletal muscle.
作者信息
Oster G, Jaffe J S
出版信息
Biophys J. 1980 Apr;30(1):119-27. doi: 10.1016/S0006-3495(80)85080-6.
Abstract
Low frequency audible vibrations are produced by human skeletal muscles undergoing sustained contraction. The effect is easily demonstrable with an electronic stethoscope which amplifies sound below 50 Hz. Autocorrelation analysis of the signal shows that it is periodic with a frequency 25 +/- 2.5 Hz. The quality of the sound is the same for all the skeletal muscles tested and is unaffected by changes in tension, ambient temperature, and blood flow. Electrically-stimulated contraction produces a sound which is indistinguishable from voluntary contraction. The amplitude of the sound increases linearly with tension. The sound signals are uncorrelated both in frequency and phase with electromyographic signals obtained simultaneously while the muscle is contacted. Arguments are presented to show that the sounds may be an intrinsic property of muscle contraction.
摘要
人体骨骼肌持续收缩会产生低频可听振动。使用能放大50赫兹以下声音的电子听诊器很容易证明这种效应。对该信号进行自相关分析表明，其频率为25±2.5赫兹，呈周期性。所有测试的骨骼肌发出的声音质量相同，且不受张力、环境温度和血流变化的影响。电刺激收缩产生的声音与自主收缩产生的声音无法区分。声音的振幅随张力呈线性增加。当肌肉收缩时，声音信号在频率和相位上与同时获得的肌电信号均不相关。文中提出了相关论据以表明这些声音可能是肌肉收缩的一种固有特性。
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