Accuracy of Base of Support Using an Inertial Sensor Based Motion Capture System

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The potential of miniature inertial sensors for human balance and gait analysis appears promising. Base of support (BOS), together with its interaction with center of mass, is a critical indicator in above mentioned research fields. This study aims to evaluate the accuracy of Xsens MVN BIOMECH, a commercial widely used inertial sensor-based motion capture system, for measuring static BOS and examine the effect of different task complexity on the accuracy. Eleven young males participated in this study and went through eleven different experimental tasks. Results showed there were considerable errors in estimating BOS area (error ranged from 12.6% to + 64.6%) from Xsens MVN and a large error in foot separation distance when there was knee flexion. The estimated BOS area from MVN was smaller than the ground truth from footprint when there was no knee flexion, and larger when there was knee flexion, and it increased monotonically along with the knee flexion angles. Wrongly estimated foot separations, mainly caused by knee flexion, and the initial system estimation error on BOS, were two major reasons for error and instability of BOS estimation. The findings suggested that caution should be taken when using Xsens MVN BIOMECH to estimate BOS and foot position-related measurements, especially for postures/motions with knee flexion.
Publisher
MDPI AG
Issue Date
2017-09
Language
English
Article Type
Article
Keywords

LOCAL DYNAMIC STABILITY; POSTURAL STABILITY; MEASUREMENT UNITS; HUMAN BALANCE; GAIT ANALYSIS; HUMAN WALKING; STEP LENGTH; BODY; ADULTS; WIDTH

Citation

SENSORS, v.17, no.9

ISSN
1424-8220
DOI
10.3390/s17092091
URI
http://hdl.handle.net/10203/226638
Appears in Collection
IE-Journal Papers(저널논문)
Files in This Item
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