| Multijoint arm stiffness during movements following stroke: Implications for robot therapy. | |
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MedLine Citation:
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PMID: 22275576 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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Impaired arm movements in stroke appear as a set of stereotypical kinematic patterns, characterized by abnormal joint coupling, which have a direct consequence on arm mechanics and can be quantified by the net arm stiffness at the hand. The current available measures of arm stiffness during functional tasks have limited clinical use, since they require several repetitions of the same test movement in many directions. Such procedure is difficult to obtain in stroke survivors who have lower fatigue threshold and increased variability compared to unimpaired individuals. The present study proposes a novel, fast quantitative measure of arm stiffness during movements by means of a Time-Frequency technique and the use of a reassigned spectrogram, applied on a trial-by-trial basis with a single perturbation. We tested the technique feasibility during robot mediated therapy, where a robot helped stroke survivors to regain arm mobility by providing assistive forces during a hitting task to 13 targets covering the entire reachable workspace. The endpoint stiffness of the paretic arm was estimated at the end of each hitting movements by suddenly switching of the assistive forces and observing the ensuing recoil movements. In addition, we considered how assistive forces influence stiffness. This method will provide therapists with improved tools to target the treatment to the individual's specific impairment and to verify the effects of the proposed exercises. |
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Authors:
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D Piovesan; M Casadio; F A Mussa-Ivaldi; P G Morasso |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: IEEE ... International Conference on Rehabilitation Robotics : [proceedings] Volume: 2011 ISSN: 1945-7901 ISO Abbreviation: IEEE Int Conf Rehabil Robot Publication Date: 2011 Jun |
Date Detail:
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Created Date: 2012-01-25 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101260913 Medline TA: IEEE Int Conf Rehabil Robot Country: United States |
Other Details:
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Languages: eng Pagination: 1-7 Citation Subset: IM |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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