The Impact of Shoulder Abduction Loading on Volitional Hand Opening and Grasping in Chronic Hemiparetic Stroke

Neurorehabilitation and Neural Repair
Yiyun LanJulius P A Dewald

Abstract

Up to 60% of individuals with moderate to severe chronic hemiparetic stroke experience excessive involuntary wrist/finger flexion that constrains functional hand movements including hand opening. It's not known how stroke-induced brain injury impacts volitional hand opening and grasping forces as a result of the expression of abnormal coupling between shoulder abduction and wrist/finger flexion or the flexion synergy. The goal of this study is to understand how shoulder abduction loading affects volitional hand opening and grasping forces in individuals with moderate to severe chronic hemiparetic stroke. Thirty-six individuals (stroke, 26; control, 10) were recruited for this study. Each participant was instructed to perform maximal hand opening and grasping forces while the arm was either fully supported or lifted with a weight equal to 25% or 50% of the participant's maximal shoulder abduction torque. Hand pentagon area, defined as the area formed by the tips of thumb and fingers, was calculated during hand opening. Forces were recorded during grasping. In individuals with moderate stroke, increasing shoulder abduction loading reduced the ability to maximally open the hand. In individuals with severe stroke, who were not able...Continue Reading

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Citations

Feb 3, 2018·Brain : a Journal of Neurology·Naveed EjazJörn Diedrichsen
Feb 20, 2018·The Journal of Physiology·Jacob G McPhersonJulius P A Dewald
Feb 20, 2019·Stroke; a Journal of Cerebral Circulation·Anne SchwarzJanne M Veerbeek
Mar 8, 2020·The Journal of Physiology·Kevin B WilkinsJulius P A Dewald
Mar 23, 2021·Experimental Brain Research·Shashwati GeedAlexander W Dromerick
Jun 27, 2021·Proceedings of the National Academy of Sciences of the United States of America·Amy N AdkinsWendy M Murray

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Software Mentioned

ACD 3D
SPSS
ACT

Related Concepts

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Brain Injury & Trauma

brain injury after impact to the head is due to both immediate mechanical effects and delayed responses of neural tissues.

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