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Automatic identification of gait events using an instrumented sock

Preece, S, Kenney, LPJ, Major, M, Dias, T, Lay, E and Fernandes, B 2011, 'Automatic identification of gait events using an instrumented sock' , Journal of NeuroEngineering and Rehabilitation, 8 , p. 32.

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Abstract

Background: textile-based transducers are an emerging technology in which piezo-resistive properties of materials are used to measure an applied strain. By incorporating these sensors into a sock, this technology offers the potential to detect critical events during the stance phase of the gait cycle. This could prove useful in several applications, such as functional electrical stimulation (FES) systems to assist gait. Methods: we investigated the output of a knitted resistive strain sensor during walking and sought to determine the degree of similarity between the sensor output and the ankle angle in the sagittal plane. In addition, we investigated whether it would be possible to predict three key gait events, heel strike, heel lift and toe off, with a relatively straight-forward algorithm. This worked by predicting gait events to occur at fixed time offsets from specific peaks in the sensor signal. Results: our results showed that, for all subjects, the sensor output exhibited the same general characteristics as the ankle joint angle. However, there were large between-subjects differences in the degree of similarity between the two curves. Despite this variability, it was possible to accurately predict gait events using a simple algorithm. This algorithm displayed high levels of trial-to-trial repeatability. Conclusions: this study demonstrates the potential of using textile-based transducers in future devices that provide active gait assistance.

Item Type: Article
Themes: Health and Wellbeing
Schools: Colleges and Schools > College of Health & Social Care > School of Health Sciences > Centre for Health Sciences Research
Journal or Publication Title: Journal of NeuroEngineering and Rehabilitation
Publisher: BioMed Central
Refereed: Yes
ISSN: 1743-0003
Depositing User: SJ Preece
Date Deposited: 28 Sep 2011 09:16
Last Modified: 21 Jul 2014 11:00
URI: http://usir.salford.ac.uk/id/eprint/17749

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