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KMID : 1195020190150020101
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Archives of Orthopedic and Sports Physical Therapy
2019 Volume.15 No. 2 p.101 ~ p.108
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The Effect of Multi-channel FES Stimulation Gait Training based on Muscle Synergy Analysis on Gait Performance in Stroke Patients: A Case Study
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Lim Tae-Hyun
Lim Jung-Hwan
Yoon Bum-Chul
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Abstract
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Purpose: Foot drop is a common symptom in disorders of the central nervous system (CNS : Central NervousSystem), such as stroke. The combination of functional electrical stimulation (FES : Functional ElectronicalStimulation) and gait rehabilitation is an effective intervention for stroke gait rehabilitation. Therefore, the aimof this study was to determine the effectiveness of FES training based on the muscle synergy pattern of strokepatients during gait.
Methods: The intervention was tested on two chronic stroke patients. They underwent a 6-week interventionconsisting of 30 min sessions of FES-supported gait three times per week. Muscle synergies were extractedfrom electromyography (EMG : electromyography) signals using a non-negative matrix factorization algorithm(NMF : Non-negative Matrix Factorization).
Results: The optimal number of synergies has been defined as the minimum number needed to obtainvariability accounted for (VAF) ?90%. Before treatment, both patients presented only three merged musclesynergies during gait, resembling two different gait abnormalities. After the 6-week intervention, the numberof extracted synergies became four and they increased their gait speed with the physiological musclesynergies. The 10m walking test (10MWT : 10Meter Walking Test) used in the first and last days of interventionincreased from 16.11 to 14.56 m/s, and from 19.76 to 15.37m/s for Subject 1 and Subject 2, respectively.
Conclusion: Multi-channel FES walking intervention based on synergy analysis influenced the number ofmuscle synergies during the gait of stroke patients. This intervention has an effective effect onimproving the gait performance of stroke patients.
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KEYWORD
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Stroke, Muscle synergy, Gait training, Functional Electronical Stimulation
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