The development of a potential optimized stimulation intensity envelope for drop foot applications

Derek T. O'Keeffe; Alan E. Donnelly; Gerard M. Lyons

doi:10.1109/TNSRE.2003.817678

The development of a potential optimized stimulation intensity envelope for drop foot applications

Derek T. O'Keeffe, Alan E. Donnelly, Gerard M. Lyons

Department of Physical Education & Sport Sciences

University of Limerick

Research output: Contribution to journal › Article › peer-review

Abstract

An optimized stimulation intensity envelope for use in hemiplegic drop foot applications has been developed. The traditional trapezoidal stimulation intensity approach has been examined and found to be inconsistent with the muscle activity patterns observed in healthy gait and therefore unsuitable. Experimental functional electrical stimulation (FES)-elicited tibialis anterior (TA) electromyography (EMG) data was taken over the ankle range of interest (occurring during active dorsiflexion and loading response) while also taking into account the type of TA muscle contraction occurring (concentric, eccentric, and isometric) and the speed of hemiplegic ankle joint rotation. Using the processed data, a model of normalized EMG versus pulsewidth was developed. Implementation of this model showed the unsuitability of the trapezoidal approach in the reproducing of a natural EMG profile. An optimized stimulation intensity profile is proposed which is expected to accurately reproduce the natural TA EMG profile during gait.

Original language	English
Pages (from-to)	249-256
Number of pages	8
Journal	IEEE Transactions on Neural Systems and Rehabilitation Engineering
Volume	11
Issue number	3
DOIs	https://doi.org/10.1109/TNSRE.2003.817678
Publication status	Published - Sep 2003

Keywords

Drop foot
Electromyography (EMG)
Functional electrical stimulation (FES)
Hemiplegia
Stimulator
Stimulus pattern

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10.1109/TNSRE.2003.817678

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abstract = "An optimized stimulation intensity envelope for use in hemiplegic drop foot applications has been developed. The traditional trapezoidal stimulation intensity approach has been examined and found to be inconsistent with the muscle activity patterns observed in healthy gait and therefore unsuitable. Experimental functional electrical stimulation (FES)-elicited tibialis anterior (TA) electromyography (EMG) data was taken over the ankle range of interest (occurring during active dorsiflexion and loading response) while also taking into account the type of TA muscle contraction occurring (concentric, eccentric, and isometric) and the speed of hemiplegic ankle joint rotation. Using the processed data, a model of normalized EMG versus pulsewidth was developed. Implementation of this model showed the unsuitability of the trapezoidal approach in the reproducing of a natural EMG profile. An optimized stimulation intensity profile is proposed which is expected to accurately reproduce the natural TA EMG profile during gait.",

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The development of a potential optimized stimulation intensity envelope for drop foot applications

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