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Titre : | Concurrent validity and within-session reliability of gait kinematics measured using an inertial motion capture system with repeated calibration (2020) |
Auteurs : | Karina Berner ; John Cockcroft ; Linzette Morris ; Quinette Louw |
Type de document : | Article |
Dans : | Journal of Bodywork and Movement Therapies (Vol. 24, n° 4, October 2020) |
Article en page(s) : | p. 251-260 |
Note générale : | doi:10.1016/j.jbmt.2020.06.008 |
Langues: | Anglais |
Descripteurs : |
HE Vinci Démarche ; Phénomènes biomécaniques |
Mots-clés: | Unité de mesure inertielle |
Résumé : |
Introduction:
Wearable inertial measurement units (IMUs) enable gait analysis in the clinic, but require calibrations that may affect subsequent gait measurements. This study assessed concurrent validity and within-session reliability of gait kinematics measured by a frequently calibrated IMU-based system. Calibration pose accuracy and intra-rater repeatability, and IMU orientation tracking accuracy, were additionally quantified. Methods: Calibration poses and gait were recorded in 15 women using IMUs and optical motion capture (OMC) (reference standard) simultaneously. Participants performed six consecutive trials: each comprising a calibration pose and a walk. IMU tracking was assessed separately (once-off) using technical static and dynamic tests. Differences of > 5° constituted clinical significance. Results: Concurrent validity for gait revealed clinically significant between-system differences for sagittal angles (root-mean-square error [RMSE] 6.7°15.0°; bias −9.3°3.0°) and hip rotation (RMSE 7.9°; bias −4.2°). After removing modelling offsets, differences for all angles (except hip rotation) were 0.8), except hip rotation, pelvic tilt and -obliquity. Within-session reliability of IMU-measured gait angles was clinically acceptable (standard error of measurement [SEM] Conclusion: A frequently calibrated IMU system provides reliable gait measurements; comparing highly to OMC after removing modelling differences. Calibration poses can be implemented accurately for most angles and consistently. IMU-measured gait data are clinically useful and comparable within participants, but should not be compared to OMC-measured data. |
Disponible en ligne : | Oui |
En ligne : | https://login.ezproxy.vinci.be/login?url=https://www.sciencedirect.com/science/article/pii/S1360859220300875 |