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A Systematic Approach to the Design and Characterization of A Smart Insole for Detecting Vertical Ground Reaction Force (vGRF) in Gait Analysis

Overview
Journal Sensors (Basel)
Publisher MDPI
Specialty Biotechnology
Date 2020 Feb 15
PMID 32053914
Citations 31
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Abstract

Gait analysis is a systematic study of human locomotion, which can be utilized in variousapplications, such as rehabilitation, clinical diagnostics and sports activities. The various limitationssuch as cost, non-portability, long setup time, post-processing time etc., of the current gait analysistechniques have made them unfeasible for individual use. This led to an increase in research interestin developing smart insoles where wearable sensors can be employed to detect vertical groundreaction forces (vGRF) and other gait variables. Smart insoles are flexible, portable and comfortablefor gait analysis, and can monitor plantar pressure frequently through embedded sensors thatconvert the applied pressure to an electrical signal that can be displayed and analyzed further.Several research teams are still working to improve the insoles' features such as size, sensitivity ofinsoles sensors, durability, and the intelligence of insoles to monitor and control subjects' gait bydetecting various complications providing recommendation to enhance walking performance. Eventhough systematic sensor calibration approaches have been followed by different teams to calibrateinsoles' sensor, expensive calibration devices were used for calibration such as universal testingmachines or infrared motion capture cameras equipped in motion analysis labs. This paper providesa systematic design and characterization procedure for three different pressure sensors: forcesensitiveresistors (FSRs), ceramic piezoelectric sensors, and flexible piezoelectric sensors that canbe used for detecting vGRF using a smart insole. A simple calibration method based on a load cellis presented as an alternative to the expensive calibration techniques. In addition, to evaluate theperformance of the different sensors as a component for the smart insole, the acquired vGRF fromdifferent insoles were used to compare them. The results showed that the FSR is the most effectivesensor among the three sensors for smart insole applications, whereas the piezoelectric sensors canbe utilized in detecting the start and end of the gait cycle. This study will be useful for any researchgroup in replicating the design of a customized smart insole for gait analysis.

Citing Articles

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Rathke C, Pimentel V, Alsina P, Santo C, Dantas A Sensors (Basel). 2024; 24(17).

PMID: 39275710 PMC: 11398167. DOI: 10.3390/s24175799.


Calibrating Low-Cost Smart Insole Sensors with Recurrent Neural Networks for Accurate Prediction of Center of Pressure.

Choi H, Yoon S, Kim J, Seo H, Choi J Sensors (Basel). 2024; 24(15).

PMID: 39123811 PMC: 11314829. DOI: 10.3390/s24154765.


Nonadditive Entropy Application to Detrended Force Sensor Data to Indicate Balance Disorder of Patients with Vestibular System Dysfunction.

Kose H, Ikizoglu S Entropy (Basel). 2023; 25(10).

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Multifractal detrended fluctuation analysis of insole pressure sensor data to diagnose vestibular system disorders.

Gunaydin B, Ikizoglu S Biomed Eng Lett. 2023; 13(4):637-648.

PMID: 37872983 PMC: 10590336. DOI: 10.1007/s13534-023-00285-9.


Integration of force and IMU sensors for developing low-cost portable gait measurement system in lower extremities.

Manupibul U, Tanthuwapathom R, Jarumethitanont W, Kaimuk P, Limroongreungrat W, Charoensuk W Sci Rep. 2023; 13(1):10653.

PMID: 37391570 PMC: 10313649. DOI: 10.1038/s41598-023-37761-2.


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