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Monitoring of Carried Weight During Walk Using a Wearable Pedobarography System
Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems. (Embedded Sensor Systems for Health (ESS-H))ORCID iD: 0000-0003-2686-4539
Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.ORCID iD: 0000-0001-8704-402X
2019 (English)In: The Fifth International Conference on Smart Portable, Wearable, Implantable and Disability-oriented Devices and Systems, SPWID 2019, July 28-August 2, pages 5-8, 2019 / [ed] Jaime Lloret, Universitat Politecnica de Valencia, Spain, IARIA, PO Box 7827, Wilmington, DE 19803, USA: International Academy, Research and Industry Association (IARIA), 2019, p. 5-8Conference paper, Published paper (Refereed)
Abstract [en]

Personal health monitoring is advantageous in heavy work environments to reduce the risk of wear and tear and acute injuries. The study of forces between the plantar surface of the foot and a supporting structure, pedobarography, is a  promising candidate for monitoring carried weight during walk. The aim of this study was to evaluate the cost effective pedobarography measurement system, IngVaL. Two aspects are evaluated, namely, how well IngVaL can monitor carried weight during walk and if the novel implementation increased the durability. Fifteen test persons made five treadmill walks with a carried weight of 10, 20, 0, 15, and 5 kg. The equipoise analysis method was used. The Root Mean Square Error (RMSE) for estimation of the carried weight was 13.8 kg. A study with the earlier version of the measurement system had a RMSE of 23.3 kg. The earlier system, as well as commercial systems using this kind of sensors, have problems with sensor durability. The new sensor implementation, where the active sensor area boundary was no longer affected by mechanical stress, resulted in no broken sensors. This study shows an increased performance of carried weight estimation compared with earlier work, together with an improved sensor durability.

Place, publisher, year, edition, pages
IARIA, PO Box 7827, Wilmington, DE 19803, USA: International Academy, Research and Industry Association (IARIA), 2019. p. 5-8
Series
SPWID, International Conference on Smart Portable, Wearable, Implantable and Disability-oriented Devices and Systems, ISSN 2519-8440 ; 5
Keywords [en]
pedobarography; carried weight; portable; wearable; insole; in-shoe
National Category
Medical Engineering
Research subject
Electronics
Identifiers
URN: urn:nbn:se:mdh:diva-45370ISBN: 978-1-61208-734-4 (electronic)OAI: oai:DiVA.org:mdh-45370DiVA, id: diva2:1357202
Conference
The Fifth International Conference on Smart Portable, Wearable, Implantable and Disability-oriented Devices and Systems, SPWID 2019, July 28-August 2, pages 5-8, 2019
Funder
Knowledge Foundation, 20120275Available from: 2019-10-03 Created: 2019-10-03 Last updated: 2019-10-14Bibliographically approved
In thesis
1. Wearable Pedobarography System for Monitoring of Walk Related Parameters
Open this publication in new window or tab >>Wearable Pedobarography System for Monitoring of Walk Related Parameters
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Health care costs have increased over the last decades due to an ageing population. Therefore, research in personal health monitoring (PHM) has increased in response to this. PHM has advantages such as mobility (monitoring of health at work or at home), early detection of health problems enabling preventive health measures and a reduction of health care cost. Human motion analysis, using for example pedobarography (PBG), is an important subcategory of PHM. PBG is used to study the force fields acting between the plantar surface of the foot and a supporting surface. Gait and posture analysis, prosthetics evaluation and monitoring of recovery from injury or disease are examples of PBG applications. Portable PBG can be performed using force sensing resistors built into the insole inside the shoe.

 In accordance with this, the research aim for this thesis is to design, build and evaluate a wireless wearable measurement system based on PBG for monitoring of walk related parameters. Monitoring of carried weight and walking speed were chosen as the applications for validation of the system. Motivations for choosing these applications are that there is a lack of a wearable system for monitoring of weight while walking and a possible combination with accelerometers to improve the estimation of walking speed. Both walking speed and weight are important factors for estimating energy expenditure. A portable system, that estimates weight while walking, enables monitoring of heavy working conditions.

The main research contributions include design of a PBG measurement system with a sensor implementation resulting in good sensor durability, several novel methods for weight estimation during walk and a novel method for analysing walking intensity and relating it to walking speed. The research results show that the new PBG system, in combination with the novel analysing methods, are suitable for use in wearable systems for monitoring of health related walk parameters.

Abstract [sv]

Kostnaderna för sjukvård har ökat de senaste decennierna på grund av att vi lever allt längre. Därför så har forskningen inom personlig hälsomonitorering (PHM) ökat som ett svar på detta. PHM har fördelar såsom mobilitet (monitorering av hälsa på jobbet eller i hemmet), tidig upptäckt av hälsoproblem gör det möjligt att sätta in förebyggande åtgärder för hälsa och reducera kostnaden för sjukvård. Rörelseanalys på människor, med hjälp av till exempel pedobarografi (PBG), är en viktig underkategori av PHM. PBG används för att studera kraftfält som verkar mellan fotens undersida och en uppbärande yta. Analys av gångstil och kroppshållning, utvärdering av proteser och övervakning av återhämtning från skada eller sjukdom är exempel på tillämpningar för PBG.

 I överrensstämmelse med detta är syftet för forskningen i den här avhandlingen att utforma, bygga och utvärdera ett trådlöst och bärbart mätsystem som bygger på PBG för övervakning av gångrelaterade parametrar. Övervakning av buren vikt och gånghastighet valdes som tillämpningarna för att utvärdera systemet. Motiveringar för att välja dessa tillämpningar är att det finns en brist på bärbara system för övervakning av vikt under gång och att en möjlig kombination med accelerometrar kan förbättra uppskattningen av gånghastighet. Både gånghastighet och vikt är viktiga faktorer vid uppskattning av energiförbrukning. Ett portabelt system, som uppskattar vikt under gång, möjliggör övervakning av tunga arbetsförhållanden.

 De främsta forskningsbidragen inkluderar utformningen av ett mätsystem baserat på PBG med sensorimplementering som ger lång livslängd för sensorerna, flera nya analysmetoder för uppskattning av vikt under gång och en ny analysmetod för gångintensitet som relateras till gånghastighet. Forskningsresultaten visar på att det nya PBG-systemet, i kombination med de nya analysmetoderna, är passande för användning i bärbara system för övervakning av hälsorelaterade gångparametrar.

Place, publisher, year, edition, pages
Västerås: Mälardalen University, 2019
Series
Mälardalen University Press Dissertations, ISSN 1651-4238 ; 301
National Category
Medical Engineering
Research subject
Electronics
Identifiers
urn:nbn:se:mdh:diva-45546 (URN)978-91-7485-444-2 (ISBN)
Public defence
2019-12-06, Delta, Mälardalens högskola, Västerås, 13:30 (English)
Opponent
Supervisors
Funder
Knowledge Foundation, 20120275
Available from: 2019-10-15 Created: 2019-10-14 Last updated: 2019-10-16Bibliographically approved

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