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Journal of NeuroEngineering and Rehabilitation
Published in: Journal of NeuroEngineering and Rehabilitation 1/2018

Open Access 01-12-2018 | Research

Speed-adaptive control of functional electrical stimulation for dropfoot correction

Authors: Guangtao Chen, Le Ma, Rong Song, Le Li, Xiaoyun Wang, Kaiyu Tong

Published in: Journal of NeuroEngineering and Rehabilitation | Issue 1/2018

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Abstract

Background

Functional electrical stimulation is an important therapy technique for dropfoot correction. In order to achieve natural control, the parameter setting of FES should be associated with the activation of the tibialis anterior.

Methods

This study recruited nine healthy subjects and investigated the relations of walking speed with the onset timing and duration of tibialis anterior activation. Linear models were built for the walking speed with respect to these two parameters. Based on these models, the speed-adaptive onset timing and duration were applied in FES-assisted walking for nine healthy subjects and ten subjects with dropfoot. The kinematic performance of FES-assisted walking triggered by speed-adaptive stimulation were compared with those triggered by the heel-off event, and no-stimulation walking at different walking speeds.

Results

Higher ankle dorsiflexion angle was observed in heel-off stimulation and speed-adaptive stimulation conditions than that in no-stimulation walking condition at all the speeds. For subjects with stroke, the ankle plantarflexion angle in speed-adaptive stimulation condition was similar to that in no-stimulation walking condition, and it was significant larger than that in heel-off stimulation condition at all speeds.

Conclusions

The improvement in ankle dorsiflexion without worsening ankle plantarflexion in speed-adaptive stimulation condition could be attributed to the appropriate stimulation timing and duration. These results provide evidence that the proposed stimulation system with speed-related parameters is more physiologically appropriate in dropfoot correction, and it may have great potential value in future clinical applications.

Trial registration

Medical Ethics Committee of Guangdong Work Injury Rehabilitation Center, AF/​SC-07/​2016.​22. Registered 26 May 2016.
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Metadata
Title
Speed-adaptive control of functional electrical stimulation for dropfoot correction
Authors
Guangtao Chen
Le Ma
Rong Song
Le Li
Xiaoyun Wang
Kaiyu Tong
Publication date
01-12-2018
Publisher
BioMed Central
Published in
Journal of NeuroEngineering and Rehabilitation / Issue 1/2018
Electronic ISSN: 1743-0003
DOI
https://doi.org/10.1186/s12984-018-0448-x

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