Dimensional reduction of balance parameters in risk of falling evaluation using a minimal number of force-sensitive resistors

Abstract

Purpose. As the instrumented insole is available for a wide commercial range in the retail trade, this study aims to reduce its overall cost using fewer sensors by carrying out an effective risk of falling evaluation. Methods. We compared the effect of reducing balance parameters using four and three force-sensing resistors (FSRs) of an instrumented insole. Data were previously collected among elderly participants during a Timed Up and Go (TUG) test. Results. While reducing the number of balance parameters, during sit-to-stand and stand-to-sit activities, the risk scores using four FSRs were not significantly different compared with three FSRs. Parameter reduction did not show any significant loss of information among the study population using four FSRs. For certain configurations of three FSRs, a significant effect of information loss was found in the study participants, revealing the importance of investigating the sensor locations in the process. Conclusions. We conclude that it is feasible to estimate a risk index during a TUG test not only after reducing the number of needed sensing units from four to three FSRs but also after reducing the number of balance parameters. The three FSRs should be located at strategic positions to avoid a significant loss of information.

Keywords:

• falls
• Timed Up and Go test
• elderly

Acknowledgements

The authors are grateful to the volunteers who gave their time so generously and helped to make this research possible.

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This study was funded by Ministère de l'Economie, de la Science et de l'Innovation (MESI), province of Quebec, Canada, as part of Programme de soutien à la valorisation et au transfert (PSVT), Volet 2.