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Title: Fabric sensor based in-shoe plantar pressure measurement system for gait and balance analysis
Authors: Shu, L
Hua, T 
Wang, YY
Li, Q
Issue Date: 2010
Source: The 3rd International Congress on Gait & Mental Function, USA, 26-28 February, 2010 How to cite?
Abstract: Spatial and temporal plantar pressure distributions are important and useful measures in footwear evaluation, athletic training, pathology foot diagnosis, clinical gait and balance analysis. However, present plantar pressure measurement and analysis systems are more or less uncomfortable to wear and expensive. This paper presents an in-shoe plantar pressure measurement and analysis system based on a textile fabric sensor array, which is soft, light, and has a high pressure sensitivity and a long service life. The sensors are connected with a soft polymeric board through conductive yarns and integrated into an insole. A stable data acquisition system interfaces with the insole, wirelessly transmits the acquired data to remote receiver through Bluetooth path. Three configuration modes are incorporated to gain connection with desktop, laptop, or smart phone, which can be configured to comfortably work in research laboratories, clinics, sport ground, and other outdoor environments. A real-time display and analysis software is presented to calculate parameters such as mean pressure, peak pressure, center of pressure (COP), and shift speed of COP. The system has a maximum sampling frequency at 100 Hz, measurement range at 10–1000 kPa. Force plate test illustrates COP measurement has a lower than 5%, 3% and 1% error in normal walking, push-off and heel-strike, respectively. Experimental results show that this system has stable performance in both static and dynamic measurements.
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