Wakeling J M, Nigg B M
Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, Calgary, Alberta, Canada T2N 1N4.
J Biomech. 2001 Apr;34(4):539-43. doi: 10.1016/s0021-9290(00)00203-7.
The purpose of this study was to develop a method to characterize the frequency and damping of vibrations in the soft tissues of the leg. Vibrations were measured from a surface-mounted accelerometer attached to the skin overlying the quadriceps muscles. The free vibrations in this soft tissue were recorded after impact whilst the muscle was performing isometric contractions at 0, 50, and 100% maximum voluntary force and with the knee held at 20, 40, and 60 degrees angles of flexion. The acceleration signals indicated that the soft tissue oscillated as under-damped vibrations. The frequency and damping coefficients for these vibrations were estimated from a model of sinusoidal oscillations with an exponential decay. This technique resolved the vibration coefficients to 2 and 7% of the mean values for frequency and damping, respectively.
本研究的目的是开发一种方法来表征腿部软组织振动的频率和阻尼。通过安装在股四头肌上方皮肤表面的加速度计测量振动。在肌肉以最大自主力的0%、50%和100%进行等长收缩且膝关节保持在20度、40度和60度屈曲角度时，记录冲击后该软组织中的自由振动。加速度信号表明软组织以欠阻尼振动的形式振荡。这些振动的频率和阻尼系数是根据具有指数衰减的正弦振荡模型估算的。该技术将振动系数的分辨率分别提高到频率和阻尼平均值的2%和7%。
