Man-Machine Systems Group, Delft University of Technology, Department of Mechanical Engineering and Marine Technology, Delft, The Netherlands.
J Electromyogr Kinesiol. 1993;3(1):13-23. doi: 10.1016/1050-6411(93)90019-S.
In a previous study the EMG records of shoulder and elbow muscles during goal-directed arm movements were discussed. Here an analysis of the kinematic signals is presented and the relation between EMG and kinematic signals is assessed in a correlation analysis. The displacement as a function of time (movement trace) is analyzed. The movement trace is described by a model with five parameters that are estimated using a least squares criterion. Four parameters describe the timing of a triphasic muscular input and a fifth parameter describes neuromuscular dynamics. The parameters provide a means to compare the shape of movement traces recorded under different experimental conditions. After scaling, the shapes of movement traces with different step sizes and velocities/durations can be compared. The scaled parameters reveal a significant dependence on the movement direction of maximally fast movements. Furthermore, the scaled parameters depend significantly on the maximum velocity obtained by the subjects. This dependence can be interpreted in terms of neural inputs and muscular dynamics, as the parameters have been defined in these terms. The parameters estimated from the kinematics have a high correlation with EMG timing. A further analysis of these correlations indicates that the movement obtained is closely coupled to activity of the four prime movers of the upper arm and of three out of four scapular muscles.
在之前的研究中，我们讨论了目标导向手臂运动期间肩部和肘部肌肉的肌电图记录。在这里，我们呈现了运动学信号的分析，并通过相关分析评估了肌电图和运动学信号之间的关系。对作为时间函数的位移（运动轨迹）进行了分析。运动轨迹由一个具有五个参数的模型描述，这些参数使用最小二乘准则进行估计。四个参数描述了三相肌肉输入的定时，第五个参数描述了神经肌肉动力学。这些参数提供了一种方法来比较在不同实验条件下记录的运动轨迹的形状。经过缩放后，可以比较具有不同步长和速度/持续时间的运动轨迹的形状。缩放后的参数显示出与最大速度运动的运动方向有显著的依赖性。此外，缩放后的参数与受试者获得的最大速度显著相关。可以根据神经输入和肌肉动力学来解释这种依赖性，因为这些参数是根据这些术语定义的。从运动学估计的参数与肌电图定时具有高度相关性。对这些相关性的进一步分析表明，所获得的运动与上臂的四个主要运动器的活动以及四个肩胛骨肌肉中的三个密切相关。
