Abstract
BackgroundWearable measurement of center of pressure (COP) coordinates is the key of obtaining the measurement of natural gait. Plantar pressure insole is the right sensing unit for plantar pressure monitoring for long-term outdoor measurements and the control of walking assisting exoskeleton robot. It’s necessary to study the configuration of pressure sensing cells.MethodsThis study explored the sensing cell configuration for the plantar pressure insole. The data of plantar pressure of walking is collected for layout variants. The RMSE of COP coordinates estimations are used as the evaluation criteria.ResultsThe RMSE of COP coordinates decreases from 8.00 to 3.20 mm as the amount of pressure sensing cells increases from 2 to 7. The size of pressure sensing cells contribute to reduce the RMSE of COP coordinates and 7 pressure sensing cells, with the size of 2.0–2.5 cm have the satisfying performance. Adding pressure sensing cell in the heel and hallux area increase the accuracy of estimating COP coordinates.ConclusionComparison results indicate that the configuration of 7 pressure sensing cells has a satisfying measurement performance.
Highlights
Wearable measurement of center of pressure (COP) coordinates is the key of obtaining the measurement of natural gait
Result of the influence of the amount and size of pressure sensing cells on the estimation accuracy of COP coordinates As it is showed in Fig. 2, when the amount of pressure sensing cells increases from 2 to 4, the accuracy of COP coordinate estimation is improved greatly and when he amount of refers to no statistical difference and 1 refers to significant statistical difference (p < 0.05)
This study utilizes root mean squared error (RMSE) of COP coordinates to evaluate the configuration of pressure sensing cells for a COP estimation insole
Summary
Wearable measurement of center of pressure (COP) coordinates is the key of obtaining the measurement of natural gait. It’s necessary to study the configuration of pressure sensing cells. Methods: This study explored the sensing cell configuration for the plantar pressure insole. Results: The RMSE of COP coordinates decreases from 8.00 to 3.20 mm as the amount of pressure sensing cells increases from 2 to 7. The size of pressure sensing cells contribute to reduce the RMSE of COP coordinates and 7 pressure sensing cells, with the size of 2.0–2.5 cm have the satisfying performance. Adding pressure sensing cell in the heel and hallux area increase the accuracy of estimating COP coordinates. Conclusion: Comparison results indicate that the configuration of 7 pressure sensing cells has a satisfying measurement performance. As only one or two isolated steps of gait can be measured with the force plate, strictly speaking, force plate is not suitable for the measurement of natural gait [7]
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