Coordination control of the muscles including the bi-articular and mono-articular muscles in the ballistic jump movement.

利用包含双关节肌的功能有效肌肉模型，建立了双关节肌腓肠肌控制跳跃地面反力方向的假设。采用肌电图和计算机模拟相结合的方法，研究了纵、跳远过程中下肢肌肉活动与跳跃方向的关系。结果表明，跳跃方向是通过改变腓肠肌激活的时间来控制的。

The hypothesis that the bi-articular muscle gastrocnemius controls the ground reaction force direction in jumping was constructed by means of the functionally effective muscle model including bi-articular muscle. The relationship between the activities of lower limb muscles and the jump direction was examined by means of electromyogram and computer simulation during the vertical and broad jump. In the result, it was clarified that jump direction was controlled by changing the timing of gastrocnemius muscle activation.