Portable Ultrasound-Based Device for Detecting Older Adults’ Sit-to-Stand Transitions in Unsupervised 30-Second Chair–Stand Tests
Lower-limb strength is a marker of functional decline in elders. This work studies the feasibility of using the quasi-periodic nature of the distance between a subjects’ back and the chair backrest during a 30-s chair–stand test (CST) to carry out unsupervised measurements based on readings from a l...
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doaj-90c7000ebec44589bf4d490c37d94c6c2020-11-25T02:37:26ZengMDPI AGSensors1424-82202020-04-01201975197510.3390/s20071975Portable Ultrasound-Based Device for Detecting Older Adults’ Sit-to-Stand Transitions in Unsupervised 30-Second Chair–Stand TestsAntonio Cobo0Elena Villalba-Mora1Dieter Hayn2Xavier Ferre3Rodrigo Pérez-Rodríguez4Alberto Sánchez-Sánchez5Raquel Bernabé-Espiga6Juan-Luis Sánchez-Sánchez7Andrea López-Diez-Picazo8Cristian Moral9Leocadio Rodriguez-Mañas10Centre for Biomedical Technology (CTB), Universidad Politécnica de Madrid (UPM), Pozuelo de Alarcón, 28223 Madrid, SpainCentre for Biomedical Technology (CTB), Universidad Politécnica de Madrid (UPM), Pozuelo de Alarcón, 28223 Madrid, SpainDigital Health Information Systems, Austrian Institute of Technology (AIT), Graz, 8020 Styria, AustriaCentre for Biomedical Technology (CTB), Universidad Politécnica de Madrid (UPM), Pozuelo de Alarcón, 28223 Madrid, SpainFundación para la Investigación Biomédica, Hospital de Getafe, Getafe, 28905 Madrid, SpainCentre for Biomedical Technology (CTB), Universidad Politécnica de Madrid (UPM), Pozuelo de Alarcón, 28223 Madrid, SpainFundación para la Investigación Biomédica, Hospital de Getafe, Getafe, 28905 Madrid, SpainFundación para la Investigación Biomédica, Hospital de Getafe, Getafe, 28905 Madrid, SpainFundación para la Investigación Biomédica, Hospital de Getafe, Getafe, 28905 Madrid, SpainCentre for Biomedical Technology (CTB), Universidad Politécnica de Madrid (UPM), Pozuelo de Alarcón, 28223 Madrid, SpainServicio de Geriatría, Hospital de Getafe, Getafe, 28905 Madrid, SpainLower-limb strength is a marker of functional decline in elders. This work studies the feasibility of using the quasi-periodic nature of the distance between a subjects’ back and the chair backrest during a 30-s chair–stand test (CST) to carry out unsupervised measurements based on readings from a low-cost ultrasound sensor. The device comprises an ultrasound sensor, an Arduino UNO board, and a Bluetooth module. Sit-to-stand transitions are identified by filtering the signal with a moving minimum filter and comparing the output to an adaptive threshold. An inter-rater reliability (IRR) study was carried out to validate the device ability to count the same number of valid transitions as the gold-standard manual count. A group of elders (age: mean (m) = 80.79 years old, SD = 5.38; gender: 21 female and seven male) were asked to perform a 30-s CST using the device while a trained nurse manually counted valid transitions. Ultimately, a moving minimum filter was necessary to cancel the effect of outliers, likely produced because older people tend to produce more motion artefacts and, thus, noisier signals. While the intra-class correlation coefficient (ICC) for this study was good (ICC = 0.86, 95% confidence interval (CI) = 0.73, 0.93), it is not yet clear whether the results are sufficient to support clinical decision-making.https://www.mdpi.com/1424-8220/20/7/1975frailty syndromesit-to-stand30-s chair stand testultrasoundsignal processing |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Antonio Cobo Elena Villalba-Mora Dieter Hayn Xavier Ferre Rodrigo Pérez-Rodríguez Alberto Sánchez-Sánchez Raquel Bernabé-Espiga Juan-Luis Sánchez-Sánchez Andrea López-Diez-Picazo Cristian Moral Leocadio Rodriguez-Mañas |
spellingShingle |
Antonio Cobo Elena Villalba-Mora Dieter Hayn Xavier Ferre Rodrigo Pérez-Rodríguez Alberto Sánchez-Sánchez Raquel Bernabé-Espiga Juan-Luis Sánchez-Sánchez Andrea López-Diez-Picazo Cristian Moral Leocadio Rodriguez-Mañas Portable Ultrasound-Based Device for Detecting Older Adults’ Sit-to-Stand Transitions in Unsupervised 30-Second Chair–Stand Tests Sensors frailty syndrome sit-to-stand 30-s chair stand test ultrasound signal processing |
author_facet |
Antonio Cobo Elena Villalba-Mora Dieter Hayn Xavier Ferre Rodrigo Pérez-Rodríguez Alberto Sánchez-Sánchez Raquel Bernabé-Espiga Juan-Luis Sánchez-Sánchez Andrea López-Diez-Picazo Cristian Moral Leocadio Rodriguez-Mañas |
author_sort |
Antonio Cobo |
title |
Portable Ultrasound-Based Device for Detecting Older Adults’ Sit-to-Stand Transitions in Unsupervised 30-Second Chair–Stand Tests |
title_short |
Portable Ultrasound-Based Device for Detecting Older Adults’ Sit-to-Stand Transitions in Unsupervised 30-Second Chair–Stand Tests |
title_full |
Portable Ultrasound-Based Device for Detecting Older Adults’ Sit-to-Stand Transitions in Unsupervised 30-Second Chair–Stand Tests |
title_fullStr |
Portable Ultrasound-Based Device for Detecting Older Adults’ Sit-to-Stand Transitions in Unsupervised 30-Second Chair–Stand Tests |
title_full_unstemmed |
Portable Ultrasound-Based Device for Detecting Older Adults’ Sit-to-Stand Transitions in Unsupervised 30-Second Chair–Stand Tests |
title_sort |
portable ultrasound-based device for detecting older adults’ sit-to-stand transitions in unsupervised 30-second chair–stand tests |
publisher |
MDPI AG |
series |
Sensors |
issn |
1424-8220 |
publishDate |
2020-04-01 |
description |
Lower-limb strength is a marker of functional decline in elders. This work studies the feasibility of using the quasi-periodic nature of the distance between a subjects’ back and the chair backrest during a 30-s chair–stand test (CST) to carry out unsupervised measurements based on readings from a low-cost ultrasound sensor. The device comprises an ultrasound sensor, an Arduino UNO board, and a Bluetooth module. Sit-to-stand transitions are identified by filtering the signal with a moving minimum filter and comparing the output to an adaptive threshold. An inter-rater reliability (IRR) study was carried out to validate the device ability to count the same number of valid transitions as the gold-standard manual count. A group of elders (age: mean (m) = 80.79 years old, SD = 5.38; gender: 21 female and seven male) were asked to perform a 30-s CST using the device while a trained nurse manually counted valid transitions. Ultimately, a moving minimum filter was necessary to cancel the effect of outliers, likely produced because older people tend to produce more motion artefacts and, thus, noisier signals. While the intra-class correlation coefficient (ICC) for this study was good (ICC = 0.86, 95% confidence interval (CI) = 0.73, 0.93), it is not yet clear whether the results are sufficient to support clinical decision-making. |
topic |
frailty syndrome sit-to-stand 30-s chair stand test ultrasound signal processing |
url |
https://www.mdpi.com/1424-8220/20/7/1975 |
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