We investigated changes in control of inter-segmental dynamics underlying upper extremity dyscoordination caused by stroke. Individuals with stroke and healthy individuals performed a natural reach-to-grasp movement. Kinetic analysis revealed that both groups rotated the shoulder by muscle torque and used interaction torque to rotate the elbow. However, individuals with stroke used interaction torque less than healthy individuals, actively suppressing a substantial portion of it. This resulted in inefficient use of active control and dyscoordination of the upper extremity. The degree of interaction torque suppression and inefficiency of active control at the elbow positively correlated with stroke severity. The increased interaction torque suppression can be a strategy used by individuals with stroke to compensate for deficient feedforward control of this torque.

中文翻译：

---

中风对掌握过程中关节控制的影响：一项初步研究。

我们调查了中风引起的上肢运动障碍的基础上节间动力学控制的变化。患有中风的人和健康的人进行了自然的握力运动。动力学分析表明，两组均通过肌肉扭矩旋转肩膀，并使用相互作用扭矩旋转肘部。然而，患有中风的人使用的互动扭矩小于健康人，从而积极地抑制了其中的大部分。这导致无效使用主动控制和上肢运动障碍。相互作用扭矩抑制的程度和肘部主动控制的效率低下与卒中严重程度呈正相关。