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Analyzing Gait in the Real World Using Wearable Movement Sensors and Frequently Repeated Movement Paths
Open AccessArticle

Development of a Bendable Outsole Biaxial Ground Reaction Force Measurement System

1
Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea
2
Division of Mechanical Systems Engineering at Sookmyung Women’s University, Seoul 04312, Korea
3
Division of Thermal and Fluids Science, Institute for Computational Science, Faculty of Electrical and Electronics Engineering, Ton Duc Thang University, Ho Chi Minh City 758307, Vietnam
4
Department of Mechanical Engineering, Incheon National University, Incheon 22012, Korea
*
Author to whom correspondence should be addressed.
Sensors 2019, 19(11), 2641; https://doi.org/10.3390/s19112641
Received: 8 May 2019 / Revised: 3 June 2019 / Accepted: 4 June 2019 / Published: 11 June 2019
(This article belongs to the Special Issue Wearable Sensors and Devices for Healthcare Applications)
Wearable ground reaction force (GRF) measurement systems make it possible to measure the GRF in any environment, unlike a commercial force plate. When performing kinetic analysis with the GRF, measurement of multiaxial GRF is important for evaluating forward and lateral motion during natural gait. In this paper, we propose a bendable GRF measurement system that can measure biaxial (vertical and anterior-posterior) GRF without interrupting the natural gait. Eight custom small biaxial force sensors based on an optical sensing mechanism were installed in the proposed system. The interference between two axes on the custom sensor was minimized by the independent application of a cantilever structure for the two axes, and the hysteresis and repeatability of the custom sensor were investigated. After developing the system by the installation of force sensors, we found that the degree of flexibility of the developed system was comparable to that of regular shoes by investigating the forefoot bending stiffness. Finally, we compared vertical GRF (vGRF) and anterior-posterior GRF (apGRF) measured from the developed system and force plate at the same time when the six subjects walked, ran, and jumped on the force plate to evaluate the performance of the GRF measurement system. View Full-Text
Keywords: ground reaction force; biaxial force sensor; reflective photomicrosensor; outsole system; forefoot bending stiffness ground reaction force; biaxial force sensor; reflective photomicrosensor; outsole system; forefoot bending stiffness
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MDPI and ACS Style

Park, J.; Kim, S.J.; Na, Y.; Kim, Y.; Kim, J. Development of a Bendable Outsole Biaxial Ground Reaction Force Measurement System. Sensors 2019, 19, 2641.

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