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EMG-based pattern recognition approach in post stroke robot-aided rehabilitation: a feasibility study

BACKGROUND: Several studies investigating the use of electromyographic (EMG) signals in robot-based stroke neuro-rehabilitation to enhance functional recovery. Here we explored whether a classical EMG-based patterns recognition approach could be employed to predict patients’ intentions while attempt...

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Autores principales: Cesqui, Benedetta, Tropea, Peppino, Micera, Silvestro, Krebs, Hermano Igo
Formato: Online Artículo Texto
Lenguaje:English
Publicado: BioMed Central 2013
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3729537/
https://www.ncbi.nlm.nih.gov/pubmed/23855907
http://dx.doi.org/10.1186/1743-0003-10-75
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author Cesqui, Benedetta
Tropea, Peppino
Micera, Silvestro
Krebs, Hermano Igo
author_facet Cesqui, Benedetta
Tropea, Peppino
Micera, Silvestro
Krebs, Hermano Igo
author_sort Cesqui, Benedetta
collection PubMed
description BACKGROUND: Several studies investigating the use of electromyographic (EMG) signals in robot-based stroke neuro-rehabilitation to enhance functional recovery. Here we explored whether a classical EMG-based patterns recognition approach could be employed to predict patients’ intentions while attempting to generate goal-directed movements in the horizontal plane. METHODS: Nine right-handed healthy subjects and seven right-handed stroke survivors performed reaching movements in the horizontal plane. EMG signals were recorded and used to identify the intended motion direction of the subjects. To this aim, a standard pattern recognition algorithm (i.e., Support Vector Machine, SVM) was used. Different tests were carried out to understand the role of the inter- and intra-subjects’ variability in affecting classifier accuracy. Abnormal muscular spatial patterns generating misclassification were evaluated by means of an assessment index calculated from the results achieved with the PCA, i.e., the so-called Coefficient of Expressiveness (CoE). RESULTS: Processing the EMG signals of the healthy subjects, in most of the cases we were able to build a static functional map of the EMG activation patterns for point-to-point reaching movements on the horizontal plane. On the contrary, when processing the EMG signals of the pathological subjects a good classification was not possible. In particular, patients’ aimed movement direction was not predictable with sufficient accuracy either when using the general map extracted from data of normal subjects and when tuning the classifier on the EMG signals recorded from each patient. CONCLUSIONS: The experimental findings herein reported show that the use of EMG patterns recognition approach might not be practical to decode movement intention in subjects with neurological injury such as stroke. Rather than estimate motion from EMGs, future scenarios should encourage the utilization of these signals to detect and interpret the normal and abnormal muscle patterns and provide feedback on their correct recruitment.
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spelling pubmed-37295372013-08-01 EMG-based pattern recognition approach in post stroke robot-aided rehabilitation: a feasibility study Cesqui, Benedetta Tropea, Peppino Micera, Silvestro Krebs, Hermano Igo J Neuroeng Rehabil Research BACKGROUND: Several studies investigating the use of electromyographic (EMG) signals in robot-based stroke neuro-rehabilitation to enhance functional recovery. Here we explored whether a classical EMG-based patterns recognition approach could be employed to predict patients’ intentions while attempting to generate goal-directed movements in the horizontal plane. METHODS: Nine right-handed healthy subjects and seven right-handed stroke survivors performed reaching movements in the horizontal plane. EMG signals were recorded and used to identify the intended motion direction of the subjects. To this aim, a standard pattern recognition algorithm (i.e., Support Vector Machine, SVM) was used. Different tests were carried out to understand the role of the inter- and intra-subjects’ variability in affecting classifier accuracy. Abnormal muscular spatial patterns generating misclassification were evaluated by means of an assessment index calculated from the results achieved with the PCA, i.e., the so-called Coefficient of Expressiveness (CoE). RESULTS: Processing the EMG signals of the healthy subjects, in most of the cases we were able to build a static functional map of the EMG activation patterns for point-to-point reaching movements on the horizontal plane. On the contrary, when processing the EMG signals of the pathological subjects a good classification was not possible. In particular, patients’ aimed movement direction was not predictable with sufficient accuracy either when using the general map extracted from data of normal subjects and when tuning the classifier on the EMG signals recorded from each patient. CONCLUSIONS: The experimental findings herein reported show that the use of EMG patterns recognition approach might not be practical to decode movement intention in subjects with neurological injury such as stroke. Rather than estimate motion from EMGs, future scenarios should encourage the utilization of these signals to detect and interpret the normal and abnormal muscle patterns and provide feedback on their correct recruitment. BioMed Central 2013-07-15 /pmc/articles/PMC3729537/ /pubmed/23855907 http://dx.doi.org/10.1186/1743-0003-10-75 Text en Copyright © 2013 Cesqui et al.; licensee BioMed Central Ltd. http://creativecommons.org/licenses/by/2.0 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research
Cesqui, Benedetta
Tropea, Peppino
Micera, Silvestro
Krebs, Hermano Igo
EMG-based pattern recognition approach in post stroke robot-aided rehabilitation: a feasibility study
title EMG-based pattern recognition approach in post stroke robot-aided rehabilitation: a feasibility study
title_full EMG-based pattern recognition approach in post stroke robot-aided rehabilitation: a feasibility study
title_fullStr EMG-based pattern recognition approach in post stroke robot-aided rehabilitation: a feasibility study
title_full_unstemmed EMG-based pattern recognition approach in post stroke robot-aided rehabilitation: a feasibility study
title_short EMG-based pattern recognition approach in post stroke robot-aided rehabilitation: a feasibility study
title_sort emg-based pattern recognition approach in post stroke robot-aided rehabilitation: a feasibility study
topic Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3729537/
https://www.ncbi.nlm.nih.gov/pubmed/23855907
http://dx.doi.org/10.1186/1743-0003-10-75
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