Abstract
The measurement of ground reaction force (GRF) and human motion in a gait measurement laboratory is accurate and easier, but expensive and constraint. The ambulatory measurement of GRF and human motion under free-living condition is inexpensive, and really desired. A wearable force plate system was developed by integrating small triaxial force sensors and 3D inertial sensors for estimating triaxial GRF in biomechanical applications. As for the measurement accuracy, we compared the developed system’s measurements of the triaxial GRF and the center of pressure (CoP) with the reference measurements of a stationary force plate and an optical motion analysis system. The RMS difference of the two transverse components (x- and y- axes) and the vertical component (z-axis) of the GRF was 4.3±0.9N, 6.0±1.3N, and 12.1±1.1N respectively, corresponding to 5.1±1.1% and 6.5±1% of the maximum of each transverse component, and to 1.3±0.2% of the maximum vertical component of GRF. The RMS distance between the two systems’ CoP traces was 3.2±0.8mm, corresponding to 1.2±0.3% of the length of the shoe. Moreover, based on the assessment results of the influence of the system on the natural gait, we found that gait was almost never affected. Therefore, the wearable system as an alternative device can be used to measure CoP and triaxial GRF in non-laboratory environments.
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Liu, T., Inoue, Y., Shibata, K. (2010). A Wearable Force Plate System Designed Using Small Triaxial Force Sensors and Inertial Sensors. In: Mukhopadhyay, S.C., Lay-Ekuakille, A. (eds) Advances in Biomedical Sensing, Measurements, Instrumentation and Systems. Lecture Notes in Electrical Engineering, vol 55. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-05167-8_5
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DOI: https://doi.org/10.1007/978-3-642-05167-8_5
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