Journal
GAIT & POSTURE
Volume 40, Issue 4, Pages 487-492Publisher
ELSEVIER IRELAND LTD
DOI: 10.1016/j.gaitpost.2014.07.007
Keywords
Accelerometry; Gait analysis; Gait events; Temporal parameters; Inertial sensor
Categories
Funding
- research project SIVAM - Wearable Sensors for Motor Ability Evaluation in the framework of the MISE-ICE-CRUI agreement
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In the last decade, various methods for the estimation of gait events and temporal parameters from the acceleration signals of a single inertial measurement unit (IMU) mounted at waist level have been proposed. Despite the growing interest for such methodologies, a thorough comparative analysis of methods with regards to number of extra andmissed events, accuracy and robustness to IMU location is still missing in the literature. The aim of this work was to fill this gap. Five methods have been tested on single IMU data acquired from fourteen healthy subjects walking while being recorded by a stereo-photogrammetric system and two force platforms. The sensitivity in detecting initial and final contacts varied between 81% and 100% across methods, whereas the positive predictive values ranged between 94% and 100%. For all tested methods, stride and step time estimates were obtained; three of the selected methods also allowed estimation of stance, swing and double support time. Results showed that the accuracy in estimating step and stride durations was acceptable for all methods. Conversely, a statistical difference was found in the error in estimating stance, swing and double support time, due to the larger errors in the final contact determination. Except for one method, the IMU positioning on the lower trunk did not represent a critical factor for the estimation of gait temporal parameters. Results obtained in this study may not be applicable to pathologic gait. (C) 2014 Elsevier B.V. All rights reserved.
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