Hatzitaki V, McKinley P
Department of Physical Education, Aristotelio University of Thessaloniki.
Res Q Exerc Sport. 1998 Dec;69(4):344-54. doi: 10.1080/02701367.1998.10607709.
A combined analysis of time, electromyographic, and joint torque measures was used to explore the force control processes underlying the dissociation of arm reaching movements performed bilaterally to targets of varying amplitude. Limb movements appeared closely coupled at movement initiation, which was confirmed by a strong tendency of the agonist muscles to remain synchronized despite any interlimb asymmetry in final target distance. On the other hand, interlimb decoupling occurred later as a result of the difference in the antagonists' timing of activation between the limbs. The partitioning of the net joint torque revealed that muscle activity is regulated in response to the intersegmental dynamics of the limb. It is proposed that spatial decoupling of asymmetrical movements becomes possible through postinitiation feedback processes which regulate muscle recruitment phenomena.
采用时间、肌电图和关节扭矩测量的综合分析方法，探究向不同幅度目标进行双侧手臂伸展运动分离背后的力控制过程。在运动起始时，肢体运动似乎紧密耦合，这一点通过以下现象得到证实：尽管最终目标距离存在肢体间不对称，但主动肌仍有强烈的保持同步的趋势。另一方面，由于肢体间拮抗肌激活时间的差异，肢体间的解耦在稍后发生。净关节扭矩的划分表明，肌肉活动是根据肢体节段间动力学进行调节的。有人提出，不对称运动的空间解耦通过调节肌肉募集现象的起始后反馈过程得以实现。
