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01-11-2007 | Research Article

Shoulder abduction-induced reductions in reaching work area following hemiparetic stroke: neuroscientific implications

Authors: Theresa M. Sukal, Michael D. Ellis, Julius P. A. Dewald

Published in: Experimental Brain Research | Issue 2/2007

Abstract

A stroke-related loss of corticospinal and corticobulbar pathways is postulated to result in an increased use of remaining neural substrates such as bulbospinal pathways as individuals with stroke are required to generate greater volitional shoulder abduction torques. The effect of shoulder abduction on upper extremity reaching range of motion (work area) was measured in 18 individuals with stroke using the Arm Coordination Training 3-D (ACT^3D) device. This robotic system is capable of quantifying movement kinematics when a subject attempts to reach while simultaneously generating various levels of active shoulder abduction torque. We have provided data demonstrating an incremental increase of abnormal coupling of elbow flexion for greater levels of shoulder abduction in the paretic limb that results in a reduction in available work area as a function of active limb support. The progressive increase in the expression of abnormal shoulder/elbow coupling can be explained by a progressive reliance on the indirect cortico-bulbospinal connections that remain in individuals following a stroke-induced brain injury.

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Title: Shoulder abduction-induced reductions in reaching work area following hemiparetic stroke: neuroscientific implications
Authors: Theresa M. Sukal
Michael D. Ellis
Julius P. A. Dewald
Publication date: 01-11-2007
Publisher: Springer-Verlag
Published in: Experimental Brain Research / Issue 2/2007
Print ISSN: 0014-4819
Electronic ISSN: 1432-1106
DOI: https://doi.org/10.1007/s00221-007-1029-6

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Shoulder abduction-induced reductions in reaching work area following hemiparetic stroke: neuroscientific implications

Abstract

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