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- Title
Design and Accuracy of an Instrumented Insole Using Pressure Sensors for Step Count.
- Authors
Ngueleu, Armelle M.; Blanchette, Andréanne K.; Bouyer, Laurent; Maltais, Désirée; McFadyen, Bradford J.; Moffet, Hélène; Batcho, Charles S.
- 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 signals during the stance phase showed high step detection accuracy (99.5 ± 0.7%–99.6 ± 0.4%) and appeared to be a valid method of step counting. Conclusions: The accuracy of step counts varied according to the calculation methods, with cumulative sum-based method being highly accurate.
- Subjects
PRESSURE sensors; MICROELECTROMECHANICAL systems; SIGNAL processing; CUMULATIVE distribution function; POTENTIAL theory (Physics)
- Publication
Sensors (14248220), 2019, Vol 19, Issue 5, p984
- ISSN
1424-8220
- Publication type
Article
- DOI
10.3390/s19050984