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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Piovesan, D. Casadio, M. Mussa-Ivaldi, F.A. Morasso, P.G. |
| Copyright Year | 2011 |
| Description | Author affiliation: Dept. of Communication Computer and System Science, University of Genova, Italian Institute of Technology, Genova, Italy (Morasso, P.G.) || Sensory Motor Performance Program, Rehab. Institute of Chicago/Northwestern University, Chicago, Illinois, USA (Piovesan, D.; Casadio, M.; Mussa-Ivaldi, F.A.) |
| Abstract | 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. |
| Starting Page | 1 |
| Ending Page | 7 |
| File Size | 625389 |
| Page Count | 7 |
| File Format | |
| ISBN | 9781424498635 |
| ISSN | 19457898 |
| e-ISBN | 9781424498628 |
| e-ISBN | 9781424498611 |
| DOI | 10.1109/ICORR.2011.5975372 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2011-06-29 |
| Publisher Place | Switzerland |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Damping Force arm impedance Resonant frequency Medical treatment robot therapy Time frequency analysis stiffness stroke Robots |
| Content Type | Text |
| Resource Type | Article |
| Subject | Rehabilitation Control and Systems Engineering Electrical and Electronic Engineering |
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