Design and Accuracy of an Instrumented Insole Using Pressure Sensors for Step Count

Sensors
Armelle M NgueleuCharles S Batcho

Abstract

Despite the accessibility of several step count measurement systems, count accuracy in real environments remains a major challenge. Microelectromechanical systems and pressure sensors seem to present a potential solution for step count accuracy. The purpose of this study was to equip an insole with pressure sensors and to test a novel and potentially more accurate method of detecting steps. Methods: Five force-sensitive resistors (FSR) were integrated under the heel, the first, third, and fifth metatarsal heads and the great toe. This system was tested with twelve healthy participants at self-selected and maximal walking speeds in indoor and outdoor settings. Step counts were computed based on previously reported calculation methods, individual and averaged FSR-signals, and a new method: cumulative sum of all FSR-signals. These data were compared to a direct visual step count for accuracy analysis. Results: This system accurately detected steps with success rates ranging from 95.5 ± 3.5% to 98.5 ± 2.1% (indoor) and from 96.5 ± 3.9% to 98.0 ± 2.3% (outdoor) for self-selected walking speeds and from 98.1 ± 2.7% to 99.0 ± 0.7% (indoor) and 97.0 ± 6.2% to 99.4 ± 0.7% (outdoor) for maximal walking speeds. Cumulative sum of pressure ...Continue Reading

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Citations

Jul 28, 2020·Sensors·David Naranjo-HernándezLaura M Roa
Nov 11, 2020·Sensors·Filippo PiccininiAntonella Carbonaro
Dec 18, 2021·Environmental Science & Technology·Henrique S BritoDuarte Araújo

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Software Mentioned

Arduino IDE
Fitbit One
GaitUp
Matlab
Fitbit Charge
Fitbit Flex
ActivPAL
Garmin Vivofit
StepWatch

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