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Sensors 2014, 14(10), 18800-18822; doi:10.3390/s141018800

Toward Real-Time Automated Detection of Turns during Gait Using Wearable Inertial Measurement Units

1
Sensory-Motor Systems Lab, ETH Zurich, Tannenstrasse 1, CH-8092 Zurich, Switzerland
2
Laboratory of Robotics, University of Ljubljana, Tržaška cesta 25, SI-1000 Ljubljana, Slovenia
*
Author to whom correspondence should be addressed.
Received: 14 April 2014 / Revised: 28 July 2014 / Accepted: 28 September 2014 / Published: 10 October 2014
(This article belongs to the Special Issue Biomedical Sensors and Systems)
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Abstract

Previous studies have presented algorithms for detection of turns during gait using wearable sensors, but those algorithms were not built for real-time use. This paper therefore investigates the optimal approach for real-time detection of planned turns during gait using wearable inertial measurement units. Several different sensor positions (head, back and legs) and three different detection criteria (orientation, angular velocity and both) are compared with regard to their ability to correctly detect turn onset. Furthermore, the different sensor positions are compared with regard to their ability to predict the turn direction and amplitude. The evaluation was performed on ten healthy subjects who performed left/right turns at three amplitudes (22, 45 and 90 degrees). Results showed that turn onset can be most accurately detected with sensors on the back and using a combination of orientation and angular velocity. The same setup also gives the best prediction of turn direction and amplitude. Preliminary measurements with a single amputee were also performed and highlighted important differences such as slower turning that need to be taken into account. View Full-Text
Keywords: gait analysis; inertial measurement units; gait event detection; wearable sensors; wireless sensor networks gait analysis; inertial measurement units; gait event detection; wearable sensors; wireless sensor networks
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Novak, D.; Goršič, M.; Podobnik, J.; Munih, M. Toward Real-Time Automated Detection of Turns during Gait Using Wearable Inertial Measurement Units. Sensors 2014, 14, 18800-18822.

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