| Effects of wrist tendon vibration on arm tracking in people post-stroke. | |
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MedLine Citation:
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PMID: 21697444 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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The goal of this study was to evaluate the influence of wrist tendon vibration on a multijoint elbow/shoulder tracking task. We hypothesized that tendon vibration applied at the wrist musculature would improve upper arm tracking performance in chronic stroke survivors through increased, generalized Ia-afferent feedback to the central nervous system (CNS). To test this hypothesis, ten chronic stroke and five neurologically intact subjects grasped the handle of a planar robot as they tracked a target through a horizontal figure-8 pattern. A total of 36 trials were completed by each subject. During the middle trials, 70 Hz tendon vibration was applied at the wrist flexor tendons. Position, velocity and electromyography data were evaluated to compare the quality of arm movements before, during and after trials with concurrent vibration. Despite tracking a target that moved at a constant velocity, hand trajectories appeared to be segmented, displaying alternating intervals of acceleration and deceleration. Segments were identifiable in tangential velocity data as single peaked, bell shaped speed pulses. When tendon vibration was applied at the wrist musculature, stroke subjects experienced improved tracking performance, in that hand path lengths and peak speed variability decreased whereas movement smoothness increased. These performance improvements were accompanied by decreases in the muscle activity during movement. Possible mechanisms behind improved movement control in response to tendon vibration may include improved sensorimotor integration, improved cortical modulation of spinal reflex activity or enhanced cortical-cerebellar communication. |
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Authors:
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Megan O Conrad; Robert A Scheidt; Brian D Schmit |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-6-22 |
Journal Detail:
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Title: Journal of neurophysiology Volume: - ISSN: 1522-1598 ISO Abbreviation: - Publication Date: 2011 Jun |
Date Detail:
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Created Date: 2011-6-23 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0375404 Medline TA: J Neurophysiol Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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1. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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