等长肌肉-关节单元的动态性能模型。

Dynamic performance model of an isometric muscle-joint unit.

作者信息

Zhou B H, Solomonow M, Baratta R, D'Ambrosia R

机构信息

Department of Orthopaedic Surgery, Louisiana State University Medical Center, New Orleans 70112, USA.

出版信息

Med Eng Phys. 1995 Mar;17(2):145-50. doi: 10.1016/1350-4533(95)91887-m.

DOI:10.1016/1350-4533(95)91887-m

PMID:7735645

Abstract

The dynamic performance model of the medial gastrocnemius muscle of the cat was determined when generating isometric force at its tendon and when transmitting that force across the joint. The frequency response model of the muscle and of the muscle-joint was developed by fitting the experimentally obtained gain and phase Bode plots with a best fit linear second order system determined by recursive least squares. It was shown that the muscle could be represented with double poles at 2.3 Hz and a time delay of 16 ms whereas the muscle-joint was represented with an additional pole at 1.8 Hz, a zero at 3.8 Hz and 16 ms time delay. The harmonic distortion was less than 5% for sinusoidal force output in the frequency range of 0.4-4 Hz, and a force range of 20-80% of the maximal justifying a linear system model. The model is useful in the design of a neuromuscular prosthesis, using electrical stimulation of the muscle nerves, as a rehabilitation procedure for paralysed patients due to spinal cord injury.

摘要

测定了猫腓肠肌内侧头在其肌腱处产生等长力以及该力通过关节传递时的动态性能模型。通过用递归最小二乘法确定的最佳拟合线性二阶系统拟合实验获得的增益和相位波特图，建立了肌肉以及肌肉-关节的频率响应模型。结果表明，肌肉可用2.3Hz的双极点和16ms的时间延迟来表示，而肌肉-关节可用1.8Hz的附加极点、3.8Hz的零点和16ms的时间延迟来表示。在0.4-4Hz频率范围内，正弦力输出的谐波失真小于5%，力范围为最大值的20-80%，这证明了线性系统模型的合理性。该模型对于设计神经肌肉假体很有用，该假体通过电刺激肌肉神经，作为脊髓损伤导致瘫痪患者的康复程序。