Authors:
Katja Orlowski
1
;
Harald Loose
2
;
Falko Eckardt
3
;
Jürgen Edelmann-Nusser
3
and
Kerstin Witte
3
Affiliations:
1
Brandenburg University of Applied Sciences and Otto-von-Guericke University, Germany
;
2
Brandenburg University of Applied Sciences, Germany
;
3
Otto-von-Guericke University, Germany
Keyword(s):
Gait Analysis, Gait Parameters, Validity, Inertial Measurements, Motion Capture.
Related
Ontology
Subjects/Areas/Topics:
Animation and Simulation
;
Applications and Services
;
Biomedical Engineering
;
Biomedical Signal Processing
;
Computer Vision, Visualization and Computer Graphics
;
Devices
;
Health Information Systems
;
Human-Computer Interaction
;
Medical Image Detection, Acquisition, Analysis and Processing
;
Motion Control
;
Physiological Computing Systems
;
Wearable Sensors and Systems
Abstract:
The purpose is to investigate the validity of an inertial-sensor based gait analysis system (InvestiGAIT) consisting
of off-the-shelf sensors and an in-house capturing and analyzing software. The gait of five persons with
transfermoral limb loss were captured with the inertial system (Shimmer sensors) and the motion capture system
(Vicon) integrating two force plates chosen as reference system in this study. Eleven gait parameters are
determined from the data of the captured gait sequences. These gait parameters were compared descriptively
and statistically using boxplots, Bland-Altman-plots, including the mean of difference (MOD) and the limits
of agreement (LoA), the standard error of the mean (SEM), the Wilcoxon test and the Pearson’s correlation
coefficient. A complete validity of the gait parameters was not assumed due to the different measurement
methods and the impact of the IMU sensor attachment (on the lower shank above the ankle). For the sound
and the amputated leg four ga
it parameters show no significant difference (stride duration, cadence, velocity,
stride length). All the other parameters have a p-value smaller than 0.05. Most of the gait parameters have
a small MOD, SEM and LoA. These values show a very small absolute difference between the gait parameters
of both systems. Based on the results the InvestiGAIT system can be assumed as valid and suitable for
follow-up investigations of human gait in research projects or the clinical environment. Nevertheless, further
investigations with healthy subjects and a sensor attachment on the subjects’ shoe are planned.
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