Furuna T, Nagasaki H
Tokyo Metropolitan Institute of Gerontology, Japan.
Percept Mot Skills. 1993 Jun;76(3 Pt 1):875-84. doi: 10.2466/pms.1993.76.3.875.
The minimum-jerk model predicts the smoothest trajectory for a class of human movements and so provides us with a kinematic measurement of skilled motor performance. To establish the limits of the model's validity, the predicted and experimentally defined movement trajectories and the joint coordination were compared in two-joint arm movements, bringing the hand from the initial position to the final position through a specified point (a via-point). Kinematic data of the movements were obtained through the SELSPOT system. The movement path, tangential velocity, and coordinated change in positions of the shoulder and elbow joints evidently deviated from those predicted by the model. These results suggest that the minimum-jerk model is not valid for movements under extreme conditions which are highly dependent on musculoskeletal dynamics.
最小急动模型预测了一类人类运动的最平滑轨迹，因此为我们提供了熟练运动表现的运动学测量方法。为了确定该模型有效性的限度，在双关节手臂运动中比较了预测的和实验确定的运动轨迹以及关节协调性，手臂从初始位置通过一个指定点（一个路径点）移动到最终位置。运动的运动学数据通过SELSPOT系统获得。运动路径、切向速度以及肩关节和肘关节位置的协调性变化明显偏离了该模型的预测结果。这些结果表明，最小急动模型对于高度依赖肌肉骨骼动力学的极端条件下的运动是无效的。
