Effect of Stroke on Joint Control during Reach-to-Grasp: A Preliminary Study. Issue 3 (3rd May 2020)

• Record Type: Journal Article
• Authors: Raj, Sandesh; Dounskaia, Natalia; Clark, William W.; Sethi, Amit
• Is Part Of: Journal of motor behavior. Volume 52:Issue 3(2020)
• Page Start: 294
• Page End: 310
• Publication Date: 2020-05-03
• Subjects: Hemiparesis -- joint coordination -- interaction torque -- inter-segmental dynamics -- submovements -- feedforward control; Human mechanics -- Periodicals; Movement, Psychology of -- Periodicals; Motor Activity -- Periodicals; Motor Skills -- Periodicals; Bewegingsleer; Mécanique humaine -- Périodiques; Psychomotricité -- Périodiques; 612.705
• DOI: 10.1080/00222895.2019.1615861
• Languages: English
• ISSNs: 0022-2895

Abstract

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.