COMPARISON BETWEEN EMG TO FORCE PROCESSING AND KINETIC-ANALYSIS FOR THE CALF MUSCLE MOMENT IN WALKING AND STEPPING
COMPARISON BETWEEN EMG TO FORCE PROCESSING AND KINETIC-ANALYSIS FOR THE CALF MUSCLE MOMENT IN WALKING AND STEPPING
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DOI：
10.1016/0021-9290(87)90308-3
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发表时间：
1987-01-01
影响因子：
2.4
通讯作者：
VANBEST, JA
中科院分区：
文献类型：
--
作者：
HOF, AL;PRONK, CNA;VANBEST, JA
在EMG力处理中，肌肉的力或相对于关节的相应肌肉力矩通过肌肉的收缩和弹性特性的模型针对EMG和肌肉长度来确定。在动力学分析中，关节力矩是根据地面反作用力和身体部分的位置和加速度通过牛顿方程计算的，基于刚体部分模型。这两种根本不同的方法已被比较，同时确定小腿肌肉的时刻和总踝关节的时刻，在步行缓慢，中等和快速，并在加强和下降一个低板凳。只要没有其他肌肉的活动，通过这两种方法获得的力矩应该是相同的。分析仅限于这些时期，从胫骨前肌肌电图评估。在每个实验条件下，三个步骤进行了分析，在21-22岁的五个主题。与动力学分析的结果相比，EMG处理显示7和54 Nm r.m.s.之间的差异。平均22 Nm r.m.s.相对于r.m.s.归一化。根据力矩本身的值，差值为0.13-0.51，平均值为0.22。在大多数情况下，EMG处理和动力学分析与r.m.s.差异的数量级与先前在测力计实验中确定的数量级相同。
In EMG to force processing the force of a muscle or the corresponding muscle moment with respect to the joint is determined for EMG and muscle length by means of a model of the muscle''s contractile and elastic properties. In kinetic analysis the joint moment is calculated from the ground reaction force and the positions and accelerations of the body segments by means of Newtonian equations, based on a rigid body segment model. These two fundamentally different methods have been compared by determining simultaneously the calf muscle moment and the total ankle moment in walking at slow, moderate and fast speed and in stepping up and down a low bench. As long as there is no activity of other muscles, the moments obtained by either method should be identical. The analysis was restricted to such periods, as assessed from the EMG of tibialis anterior. In each experimental condition three steps were analyzed in five subjects of 21-22 yr. In comparison with the results of kinetic analysis, EMG processing shows differences between 7 and 54 Nm r.m.s. with an average of 22 Nm r.m.s. Normalized with respect to the r.m.s. value of the moment itself, the differences amount to 0.13-0.51, with an average of 0.22. In the majority of cases there was no systematic deviation between EMG processing and kinetic analysis and the r.m.s. difference was of the same order of magnitude as determined previously in ergometer experiments.