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Research Articles

Effect of Stroke on Joint Control during Reach-to-Grasp: A Preliminary Study

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Pages 294-310 | Received 05 Dec 2018, Accepted 25 Apr 2019, Published online: 20 May 2019
 

Abstract

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.

Additional information

Funding

This work was supported by the University Honors College and the Department of Occupational Therapy at the University of Pittsburgh.

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