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  • 1.
    Abdul-Ahad, Amir Stefan
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Çürüklü, Baran
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Folke, Mia
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Lindén, Maria
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Indirect Wavelet-Based Cardio Arrhythmia Detection Algorithm2008Inngår i: Medicinteknikdagarna, Gothenburg, Sweden, 2008, s. 14-15Konferansepaper (Fagfellevurdert)
  • 2.
    Ahmed, Mobyen Uddin
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Begum, Shahina
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Funk, Peter
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Xiong, Ning
    Mälardalens högskola, Akademin för innovation, design och teknik.
    von Schéele, Bo
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Lindén, Maria
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Folke, Mia
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Intelligent Stress Management System2009Inngår i: Medicinteknikdagarna 2009, 2009Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Today, in our daily life we are subjected to a wide range of pressures. When the pressures exceed the extent that we are able to deal with then stress is trigged. High level of stress may cause serious health problems i.e. it reduces awareness of bodily symptoms. So, people may first notice it weeks or months later meanwhile the stress could cause more serious effect in the body and health. A difficult issue in stress management is to use biomedical sensor signals in the diagnosis and treatment of stress. This paper presents a case-based system that assists a clinician in diagnosis and treatment of stress. The system uses a finger temperature sensor and the variation in the finger temperature is one of the key features in the system. Several artificial intelligence techniques such as textual information retrieval, rule-based reasoning (RBR), and fuzzy logic have been combined together with case-based reasoning to enable more reliable and efficient diagnosis and treatment of stress. The performance has been validated implementing a research prototype and close collaboration with experts.

  • 3.
    Begum, Shahina
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Ahmed, Mobyen Uddin
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Funk, Peter
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Xiong, Ning
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Folke, Mia
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Case-Based Reasoning Systems in the Health Sciences: A Survey of Recent Trends and Developments2011Inngår i: IEEE transactions on systems, man and cybernetics. Part C, Applications and reviews, ISSN 1094-6977, E-ISSN 1558-2442, Vol. 41, nr 4, s. 421-434Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The Health Sciences are, nowadays, one of the major application areas for case-based reasoning (CBR). The paper presents a survey of recent medical CBR systems based on a literature review and an e-mail questionnaire sent to the corresponding authors of the papers where these systems are presented. Some clear trends have been identified, such as multipurpose systems: more than half of the current medical CBR systems address more than one task. Research on CBR in the area is growing, but most of the systems are still prototypes and not available on the market as commercial products. However, many of the projects/systems are intended to be commercialized.

  • 4.
    Begum, Shahina
    et al.
    Mälardalens högskola, Institutionen för datavetenskap och elektronik.
    Ahmed, Mobyen Uddin
    Mälardalens högskola, Institutionen för datavetenskap och elektronik.
    Funk, Peter
    Mälardalens högskola, Institutionen för datavetenskap och elektronik.
    Xiong, Ning
    Mälardalens högskola, Institutionen för datavetenskap och elektronik.
    Folke, Mia
    Mälardalens högskola, Institutionen för datavetenskap och elektronik.
    von Schéele, Bo
    Mälardalens högskola, Institutionen för datavetenskap och elektronik.
    A computer-based system for the assessment and diagnosis of individual sensitivity to stress in Psychophysiology2007Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Increased exposure to stress may cause serious health problems leading to long term sick leave if undiagnosed and untreated. The practice amongst clinicians' to use a standardized procedure measuring blood pressure, ECG, finger temperature, breathing speed etc. to make a reliable diagnosis of stress and stress sensitivity is increasing. But even with these measurements it is still difficult to diagnose due to large individual variations. A computer-based system as a second option for the assessment and diagnosis of individual stress level is valuable in this domain.

    A combined approach based on a calibration phase and case-based reasoning is proposed exploiting data from finger temperature sensor readings from 24 individuals. In calibration phase, a standard clinical procedure with six different steps helps to establish a person's stress profile and set up a number of individual parameters. When acquiring a new case, patients are also asked to provide a fuzzy evaluation on how reliable was the procedure to define the case itself. Such a reliability "level" could be used to further discriminate among similar cases. The system extracts key features from the signal and classifies individual sensitivity to stress. These features are stored into a case library and similarity measurements are taken to assess the degrees of matching and create a ranked list containing the most similar cases retrieved by using the nearest-neighbor algorithm.

    A current case (CC) is compared with two other stored cases (C_92 and C_115) in the case library. The global similarity between the case CC and case C_92 is 67% and case CC and case C_115 is 80% shown by the system. So the case C_115 has ranked higher than the case C_92 and is more similar to current case CC. If necessary, the solution for the best matching case can be revised by the clinician to fit the new patient. The current problem with confirmed solution is then retained as a new case and added to the case library for future use.

    The system allows us to utilize previous experience and at the same time diagnose stress along with a stress sensitivity profile. This information enables the clinician to make a more informed decision of treatment plan for the patients. Such a system may also be used to actively notify a person's stress levels even in the home environment.

  • 5.
    Begum, Shahina
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Ahmed, Mobyen Uddin
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Funk, Peter
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Xiong, Ning
    Mälardalens högskola, Akademin för innovation, design och teknik.
    von Schéele, Bo
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Lindén, Maria
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Folke, Mia
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Diagnosis and Biofeedback System for Stress2009Inngår i: Proceedings of the 6th International Workshop on Wearable, Micro, and Nano Technologies for Personalized Health: "Facing Future Healthcare Needs", pHealth 2009, 2009, s. 17-20Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Today, everyday life for many people contain many situations that may trigger stress or result in an individual living on an increased stress level under long time. High level of stress may cause serious health problems. It is known that respiratory rate is an important factor and can be used in diagnosis and biofeedback training, but available measurement of respiratory rate are not especially suitable for home and office use. The aim of this project is to develop a portable sensor system that can measure the stress level, during everyday situations e.g. at home and in work environment and can help the person to change the behaviour and decrease the stress level. The sensor explored is a finger temperature sensor. Clinical studies show that finger temperature, in general, decreases with stress; however this change pattern shows large individual variations. Diagnosing stress level from the finger temperature is difficult even for clinical experts. Therefore a computer-based stress diagnosis system is important. In this system, case-based reasoning and fuzzy logic have been applied to assists in stress diagnosis and biofeedback treatment utilizing the finger temperature sensor signal. An evaluation of the system with an expert in stress diagnosis shows promising result.

  • 6. Boman, Inga-Lill
    et al.
    Ehn, Maria
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Sjölinder, Marie
    Folke, Mia
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Hansson, Pär
    Sommerfeld, Disa
    Borg, Jörgen
    Users’ and health-care professionals’ contributions in developing a home-based stroke rehabilitation tool2014Konferansepaper (Fagfellevurdert)
  • 7.
    Ehn, Maria
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Hansson, P.
    SICS Swedish ICT, Kista, Sweden.
    Sjölinder, M.
    SICS Swedish ICT, Kista, Sweden.
    Boman, I. -L
    Karolinska Institutet, Solna, Sweden .
    Folke, Mia
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Sommerfeld, D.
    SICS Swedish ICT, Kista, Sweden.
    Borg, J.
    SICS Swedish ICT, Kista, Sweden.
    Palmcrantz, S.
    SICS Swedish ICT, Kista, Sweden.
    Users perspectives on interactive distance technology enabling home-based motor training for stroke patients2015Inngår i: Studies in Health Technology and Informatics, vol. 211, 2015, s. 145-152Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The aim of this work has been to develop a technical support enabling home-based motor training after stroke. The basis for the work plan has been to develop an interactive technical solution supporting three different groups of stroke patients: (1) patients with stroke discharged from hospital with support from neuro team; (2) patients with stroke whose support from neuro team will be phased out and (3) patients living with impaired motor functions long-term. The technology has been developed in close collaboration with end-users using a method earlier evaluated and described [12]. This paper describes the main functions of the developed technology. Further, results from early user-tests with end-users, performed to identify needs for improvements to be carried out during further technical development. The developed technology will be tested further in a pilot study of the safety and, usefulness of the technology when applied as a support for motor training in three different phases of the post-stroke rehabilitation process. 

  • 8.
    Ehn, Maria
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Hansson, Pär
    SICS Swedish ICT, Stockholm, Sweden.
    Sjölinder, Marie
    SICS Swedish ICT, Stockholm, Sweden.
    Boman, Inga-Lill
    Karolinska Institutet, Stockholm, Sweden.
    Folke, Mia
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Sommerfeld, Disa
    Karolinska Institutet, Stockholm, Sweden.
    Borg, Jörgen
    Karolinska Institutet, Stockholm, Sweden.
    Interaktiv distanslösning för motorisk träning av patienter med stroke i hemmiljö2014Inngår i: Medicinteknikdagarna 2014 MTD10, 2014Konferansepaper (Fagfellevurdert)
  • 9.
    Ehn, Maria
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Sjölinder, M.
    SICS Swedish ICT, Kista, Sweden .
    Boman, I. -L
    Department of Clinical Sciences, Karolinska Institute, Danderyd Hospital, Stockholm, Sweden .
    Folke, Mia
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Hansson, P.
    SICS Swedish ICT, Kista, Sweden .
    Sommerfeld, D.
    Karolinska University Hospital, Department of Geriatric Medicine.
    Nylander, S.
    SICS Swedish ICT, Kista, Sweden .
    Borg, J.
    A multi-disciplinary approach in the development of a stroke rehabilitation tool2014Inngår i: Lecture Notes in Computer Science, vol. 8512, 2014, nr PART 3, s. 351-362Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This work describes a method used in the development of a stroke rehabilitation tool. The method was based on three key elements. The first key element was iterations between the use of broad groups with different professionals/stakeholders and small hands-on working groups with users from the same profession. The second key element was movement between understanding differences between different organizations and professionals and understanding of specific needs within the different organizations. The final key element was including implementation aspects from the very start of the work.

  • 10.
    Folke, Mia
    Mälardalens högskola, Akademin för innovation, design och teknik.
    A portable intensity guidance system for fitness training based on non-invasive detection of the lactate threshold2010Inngår i: Proceedings of the 6th International Workshop on Wearable, Micro, and Nano Technologies for Personalized Health: "Facing Future Healthcare Needs", pHealth 2009, 2010, s. 61-64Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Daily moderate activity reduces markedly several population diseases. Still many persons do not perform any regular physical activity. Many persons quit because they exercise at too low intensity that does not give result, or at too high intensity that is not comfortable. By exercising at an established adequate workload, optimal for the individual, the person can see results of the training and the quitting behavior can be changed. In sport at top level, the lactate threshold is used as a guideline for adequate workload, and to see changes in fitness. The lactate threshold is generally established by blood tests. 

  • 11.
    Folke, Mia
    Mälardalens högskola, Institutionen för datavetenskap och elektronik.
    A system for optimizing an athletes performance2006Konferansepaper (Fagfellevurdert)
  • 12.
    Folke, Mia
    Mälardalens högskola, Institutionen för datavetenskap och elektronik.
    Estimate the Individual Anaerobic Threshold by measuring End-tidal carbon dioxideInngår i: International Journal of Sports Medicine, ISSN 0172-4622, E-ISSN 1439-3964Artikkel i tidsskrift (Fagfellevurdert)
  • 13.
    Folke, Mia
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Estimation of the lactate threshold using an electro acoustic sensor system analysing the respiratory air2008Inngår i: Medical and Biological Engineering and Computing, ISSN 0140-0118, E-ISSN 1741-0444, Vol. 46, nr 9, s. 939-942Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The lactate threshold is used by athletes to optimise the intensity during exercise. It is of interest to measure the threshold on the very day and during the present sport activity. Steady state ergometer tests have been performed on 40 individuals to compare the threshold found by an electro acoustic sensor system to the lactate threshold established by blood analyses evaluated with the Dmax method. The correlation coefficient between the threshold found by the sensor system and the one established by blood analyses regarding workload (Watt), heart rate (beats/min), and lactate level (mmol lactate/l blood) at the thresholds were 0.87 (p < 0.001), 0.74 (p < 0.001), and 0.65 (p < 0.001), respectively. The findings in this study indicates that the thresholds of individuals measured by the sensor system show good correlations to the threshold established with the Dmax method from lactate levels in blood samples. 

  • 14.
    Folke, Mia
    Mälardalens högskola, Institutionen för datavetenskap och elektronik.
    Ett system som optimerar prestationsförmågan hos en idrottare2007Konferansepaper (Fagfellevurdert)
  • 15.
    Folke, Mia
    Mälardalens högskola, Institutionen för datavetenskap och elektronik.
    Measurements of Respiratory Carbon Dioxide2005Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [sv]

    Koldioxid är en central parameter för metabolismen i alla levande varelser. Hos människan regleras koldioxidhalten främst genom andningen. Därför är det viktigt att kunna mäta och övervaka koldioxidhalten i fysiologiska applikationer så väl inom sportmedicin som inom vården, till exempel på intensivvårdsavdelningar. Dessa mätningar kräver adekvat mätutrustning.

    Syftet med denna avhandling är att kritiskt granska föreslagna metoder för övervakning av andningsaktiviteten, att föreslå och utveckla förbättringar, samt att föreslå och utveckla nya applikationer för mätning av koldioxidhalten i utandningsluften med hjälp av en elektroakustisk sensor.

    Mätning av koldioxid i utandningsluften har den fördelen över andra föreslagna metoder för andningsövervakning att den även ger information om förhållandet i arteriellt blod då partialtrycket för koldioxid i slutet av ett andetag är lika stort som i artärblod hos lungfriska personer.

    Den föreslagna tekniken bygger på en elektroakustisk sensor som kan registrera och mäta koldioxidhalten i utandningsluften om fukt- och temperaturvariationer utjämnas med hjälp av filter. Den elektroakustiska sensorn består av en ultraljudssändare och en reflektor placerade i varsin ände av ett perforerat rör. Den elektriska impedansen i sensorn representerar molekylvikten inne i sensorkaviteten. Molekylmassan har ett linjärt förhållande till koldioxidhalten så länge övriga gaser hålls konstanta.

    Det faktum att partialtrycket av koldioxid i slutet av ett andetag kan mätas med den elektroakustiska sensorn gör den användbar i flera kliniska situationer om andra gaser inte kan påverka mätningarna.

    Partialtrycket av koldioxid i slutet av ett andetag har visat sig vara användbar som en indikator för mjölksyratröskeln då personens individuella mjölksyratröskel infaller då partialtrycket av koldioxid i slutet av ett andetag börjar minska. Det ger en ny applikation inom sportmedicin. På det sättet är det möjligt för en idrottare att mäta variationerna i sin mjölksyratröskel, i sin egen sport på daglig basis, vilket kan användas för att optimera arbetsintensiteten under träning och tävling. Trots att det elektroakustiska sensorsystemet inte är selektivt för koldioxid och därför påverkas även av förändringar i syre i utandningsluften har det visat sig fungera i denna applikation.

  • 16.
    Folke, Mia
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Portable intensity guidance system for fitness training2009Konferansepaper (Fagfellevurdert)
  • 17.
    Folke, Mia
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Produktutveckling inom ramen for ett forskningsprojekt2011Inngår i: Medicinteknikdagarna 2011, Linkoping, Sweden, 2011Konferansepaper (Fagfellevurdert)
  • 18.
    Folke, Mia
    Mälardalens högskola, Institutionen för datavetenskap och elektronik.
    Utveckling av ett system för identifiering av laktattröskeln2007Konferansepaper (Fagfellevurdert)
  • 19.
    Folke, Mia
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Vidareutveckling av ett system for non-invasiv identifiering av mjolksyratroskeln2009Konferansepaper (Fagfellevurdert)
  • 20.
    Folke, Mia
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Bexander, Catharina
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Gerdtman, Christer
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Brodd, Anita
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Lindén, Maria
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Sensor system for rehabilitation of patients suffering from WAD 2009Inngår i: Medicinteknikdagarna, Vasteras, 2009Konferansepaper (Fagfellevurdert)
  • 21.
    Folke, Mia
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Brangefält, Lotta
    Mälardalens högskola, Akademin för hälsa, vård och välfärd, Hälsa och välfärd.
    Cernerud, Lars
    Mälardalens högskola, Akademin för hälsa, vård och välfärd, Hälsa och välfärd.
    Söderlund, Anne
    Mälardalens högskola, Akademin för hälsa, vård och välfärd, Hälsa och välfärd.
    Framja fysisk aktivitet med LACTA och motiverande samtal2010Konferansepaper (Fagfellevurdert)
  • 22.
    Folke, Mia
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Brangefält, Lotta
    Mälardalens högskola, Akademin för hälsa, vård och välfärd, Hälsa och välfärd.
    CERNERUD, LARS
    Mälardalens högskola, Akademin för hälsa, vård och välfärd, Hälsa och välfärd.
    Söderlund, Anne
    Mälardalens högskola, Akademin för hälsa, vård och välfärd, Hälsa och välfärd.
    PROMOTING PHYSICAL ACTIVITY OF NON-REGULARLY ACTIVE PERSONS: the use of workload at lactate threshold and motivating interviewing2010Inngår i: 3 rd International Congress on Physical Activity and Public Health, 2010Konferansepaper (Fagfellevurdert)
  • 23.
    Folke, Mia
    et al.
    Mälardalens högskola, Institutionen för datavetenskap och elektronik.
    Cererud, L.
    Ekström, M.
    Hök, Bertil
    Critical review of non-invasive respiratory monitoring in medical care2003Inngår i: Medical & Biological Engineering & Computing, Vol. 41, nr 4, s. 377-383Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Respiratory failure can be difficult to predict. It can develop into a life-threatening condition in just a few minutes, or it can build up more slowly. Thus continuous monitoring of respiratory activity should be mandatory in clinical, high-risk situations, and appropriate monitoring equipment could be life-saving. The review considers non-invasive methods and devices claimed to provide information about respiratory rate or depth, or gas exchange. Methods are categorised into those responding to movement, volume and tissue composition detection; air flow, and blood gas concentration. The merits and limitations of the methods and devices are analysed, considering information. content and their ability to minimise the rate of false alarms and false non-alarms. It is concluded that the field of non-invasive respiratory monitoring is still in an exploratory phase, with numerous reports on specific device solutions but less work on evaluation and adaptation to clinical requirements. Convincing evidence of the clinical usefulness of respiratory monitors is still lacking. Devices responding only to respiratory rate, and lacking information about actual gas exchange, will have limited clinical value. Furthermore, enhancement in specificity and sensitivity to avoid false alarms and non-alarms will be necessary to meet clinical requirements. Miniature CO2 sensors are identified as one route towards substantial improvement.

  • 24.
    FOLKE, MIA
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik.
    CERNERUD, LARS
    Mälardalens högskola, Akademin för hälsa, vård och välfärd.
    Individual levels for physical activity: a new non-invasive lactate threshold measurement2008Konferansepaper (Fagfellevurdert)
  • 25.
    Folke, Mia
    et al.
    Mälardalens högskola, Institutionen för datavetenskap och elektronik.
    Granstedt, Fredrik
    Hök, Bertil
    Hök Instrument AB, Västerås, Sweden .
    Scheer, Håkan
    Västerås Central Hospital, Sweden.
    Comparative Provocation Test of Respiratory Monitoring Methods2002Inngår i: Journal of Clinical Monitoring and Computing, ISSN 1387-1307, Vol. 17, nr 2, s. 97-103Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Objective. The aim of this study was to compare clinically relevant performance of: 1) a prototype respiratory sensor based on capnometry with two alternative signal receptor fixations, 2) a fiberoptic humidity sensor and 3) human visual observation. Comparative provocation tests were performed on volunteers at the Post-Anesthesia Care Unit at Västerås Central Hospital. Methods. The experimental tests involved 10 healthy, voluntary test subjects, instructed to intersperse normal breathing with protocol provocations of breath holding, limb and head movements, and nasal oxygen supplement. The signal outputs from the three respiratory monitoring methods were recorded on a personal computer. The signal analysis included visual categorising of the signals and counting breath events. Recognising that none of the methods could act as reference, events were classified as "unanimous," "majority" or "minority" events depending on how many of the three methods that detected a breath. Results. The average total recording time was 37 minutes per subject. The respiratory rates varied from 6.5 to 19 breaths per minute, with a mean value of 11.4 breaths/minute. The breath hold duration ranged from 18 to 50 seconds. Discrepancies between the three methods were found in more than 20% of the marked events. The most frequent majority events were due to events not recorded by the observer who, on the other hand, contributed the least to minority events. The provocations made by the subjects during the measurement did not increase the rates of majority and minority events, compared to periods of no provocation. The fiberoptic device exhibited a large count of minority events but a smaller contribution to majority events than the capnometry prototype. Conclusions. The capnometry and fiberoptic sensors exhibit differences in responses that may be understood from basic principles. The importance of the physical application of the sensor to the patient was clearly observed. The optimum design remains to be found.

  • 26.
    Folke, Mia
    et al.
    Mälardalens högskola, Institutionen för datavetenskap och elektronik.
    Gullstrand, L.
    Hök, Bertil
    A pilot study to estimate the lactate threshold using an electro acoustic sensor2005Konferansepaper (Annet vitenskapelig)
  • 27.
    Folke, Mia
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Hermans, Frederic
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Rodhe, Ioana
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Björkman, Mats
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Lindén, Maria
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Gunningberg, Per
    Mälardalens högskola, Akademin för innovation, design och teknik.
    A non-invasive, mobile system for lactate threshold estimation2011Inngår i: Medicinteknikdagarna 2011, Linkoping, Sweden, 2011Konferansepaper (Fagfellevurdert)
  • 28.
    Folke, Mia
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Hermans, Frederic
    Rodhe, Ioana
    Björkman, Mats
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Lindén, Maria
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Gunningberg, Per
    Mobile system for establishing the lactate threshold by analysing the respiratory air2011Konferansepaper (Fagfellevurdert)
  • 29.
    Folke, Mia
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Hök, Bertil
    Mälardalens högskola, Akademin för innovation, design och teknik.
    A new capnograph based on an electro acoustic sensor2008Inngår i: Medical and Biological Engineering and Computing, ISSN 0140-0118, E-ISSN 1741-0444, Vol. 46, s. 55-59Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    End tidal carbon dioxide measurements with an electro acoustic capnograph prototype have been demonstrated. The aim of this study was to verify that it is possible to obtain an adequate capnogram using the prototype and to investigate the influence of ambient temperature and humidity variations. By simultaneous measurements with a reference capnograph, on subjects performing exercise, hypo- and hyperventilation, PETCO2 readings from the reference were compared with the output signal from the prototype. The capnogram from the prototype correlated well with the reference in terms of breath time. The first parts of the expiration and inspiration phases were steeper for the reference than the prototype. The output signal from the prototype correlated well with the reference PETCO2 readings with a correlation coefficient of 0.93 at varied temperature and relative humidity. 

  • 30.
    Folke, Mia
    et al.
    Mälardalens högskola, Institutionen för datavetenskap och elektronik.
    Hök, Bertil
    Hök Instrument AB, Västerås, Sweden .
    Ekström, Mikael
    Mälardalens högskola, Institutionen för datavetenskap och elektronik.
    Bäcklund, Ylva
    Mälardalens högskola, Institutionen för datavetenskap och elektronik.
    End tidal carbon dioxide measurement using an electro acoustic sensor2004Inngår i: Annual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings, 2004, s. 3452-3455Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    End tidal carbon dioxide measurement with an electro-acoustic sensor is demonstrated. The sensor consists of an acoustic resonator coupled to a low cost electro-acoustic element. By simultaneous measurements with a reference sensor, the new device was tested on subjects performing exercise, hypo- and hyperventilation whereby the CO2 concentration ranged from 2.1 to 7.0 kPa. The output from the experimental device correlated well with the reference CO2 readings with a correlation coefficient of 0.976. Response time for expiration less than 0.8 seconds was noted. The new device could be useful in situations where selectivity to other gases is not important.

  • 31.
    Folke, Mia
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Åkerberg, Anna
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Tekniker som stimulerar till okad fysisk aktivitet2011Inngår i: Medicinteknikdagarna 2011, Linkoping, Sweden, 2011Konferansepaper (Fagfellevurdert)
  • 32.
    Gerdtman, Christer
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Folke, Mia
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Bexander, Catharina
    Hälsans hus.
    Brodd, Anita
    Mälardoktorerna HB.
    Lindén, Maria
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Portable sensor system for rehabilitation of WAD patients2009Inngår i: Proceedings of the 6th International Workshop on Wearable, Micro, and Nano Technologies for Personalized Health: "Facing Future Healthcare Needs", IEEE , 2009, s. 65-68Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Whiplash Associated Disorders (WAD) are several remaining symptoms after an acceleration-/deceleration injury of the neck, often due to a road accident. Common symptoms are neck pain, headache, stiffness, loss of sensation, memory impairment and concentration difficulties. The whiplash-related injuries were estimated to cost Sweden more than SEK 4 billion 2005, the main part of these costs takes the form of compensation for loss of income, as a result of incapacity for work. The aim of this project has been to develop a training and rehabilitation system for patients suffering from WAD. The portable system is based on a 2-axis gyroscopic sensor with a computer interface. The sensor system is placed on the head of the patient and movements of the head are mirrored on the computer screen. The patient is supposed to follow a visible track on the screen. This enables interactive training facilities for patients, who can use the system unsupervised in their home environment.

  • 33.
    Granstedt, Fredrik
    et al.
    Mälardalens högskola, Institutionen för datavetenskap och elektronik.
    Folke, Mia
    Mälardalens högskola, Institutionen för datavetenskap och elektronik.
    Bäcklund, Ylva
    Mälardalens högskola, Institutionen för datavetenskap och elektronik.
    Hök, Bertil
    Hök Instrument AB, Sweden.
    Gas sensor with electroacoustically coupled resonator2001Inngår i: Sensors and Actuators, ISSN 0925-4005, Vol. 78, s. 161-165Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A new configuration for a gas sensor is demonstrated. The configuration consists of an electroacoustic element coupled to an acoustic resonator, such as Kundt's tube, exhibiting a resonance frequency that is related to the velocity of sound, which, in turn is a function of the molecular mass of the gas within the resonator. Electrical impedance measurements were performed, whereby a resonance peak attributable to the resonator was identified. Contributing effects to the quality factor, Q, of the resonance, was analyzed. Predictable shifts of the resonance frequency were observed when adding CO2 and He to air, and when varying the resonator length. Linearity within the experimental accuracy was confirmed. The new sensor configuration offers the potential advantages of smaller size, improved dynamic response, and lower cost. © 2001 Elsevier Science B.V. All rights reserved.

  • 34.
    Gustafsson, Christine
    et al.
    Mälardalens högskola, Akademin för hälsa, vård och välfärd, Hälsa och välfärd.
    Åkerberg, Anna
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Folke, Mia
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Therese, Bjurquist
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Lindén, Maria
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    A method to create interdisciplinary health and welfare technology research projects: collaboration between academia and care providers2016Inngår i: The one-page paper collection of the 10th World Conference of Gerontechnology / [ed] Johanna EMH van Bunswijk, 2016, Vol. 15, s. 29-29Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We are facing an aging population1 and the need for health and welfare technology to meet the users’ ‘need is a fact. To meet this challenge, the Arena for Health and Welfare Technology (the Arena) was initiated at Mälardalen University in 2014, as a multi-professional and interdisciplinary research initiative2. The aim of the Arena is to increase the collaboration of the researchers from the University and the external actors to create benefit and value for the future health and welfare. The Arena organizes events promoting interaction and interdisciplinary research projects. At a thematic day in May 2016, a working process to effectively initiate interdisciplinary research based on the users ‘needs, was introduced. Method To increase the participation for the thematic day and for future research projects within health and welfare technology, a call offering a grand from the Arena fond was created for participants that attended the thematic day. This call was aimed at stimulate the creation of interdisciplinary research projects within health and welfare technology, with the purpose to write proposals for external research funding. Speakers from the region were invited, representing health and social care, companies within the health and welfare technology field and regional R&D units. The speakers were presenting real needs based from the view of the clients, patients, relatives, staffs and organizations, which possibly could be solved by using health and welfare technology. After the user need presentations, a working process was followed, led by the company Konkret Utveckling AB. The goal of the working process was to identify prioritized needs for the day, and in the continuation create project groups to be the basis for future interdisciplinary research projects. After identifying the prioritized user needs, project groups started work to specify the framework for the planned research project, and then make a short oral presentation to share and discuss their research ideas. Results & Discussion The theme day attracted more than 50 interested participants. At the end of the thematic day, four interdisciplinary groups, including new constellations of researchers exists. The aims of the four groups were based on prioritized user needs, presented by regional health and welfare representatives. Involved group participants, researchers and company representatives, represented different disciplines, for example engineering, sensor technology, robotics, pedagogics, physiotherapy, nursing, social work and economy. The working method used during the thematic day was successful, and can be used in developing initiatives for interdisciplinary health and welfare technology research projects based on the needs of the end users.

  • 35.
    Hagblad, Jimmie
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Folke, Mia
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Lindberg, Lars-Goran
    Linkoping Univ.
    Lindén, Maria
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Technical issues related to the long-term monitoring of blood flow at different depths using LDF and PPG2012Inngår i: Physiological Measurement, ISSN 0967-3334, E-ISSN 1361-6579, Vol. 33, nr 6, s. 985-996Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The aim of this study was to evaluate an integrated probe using LDF and multiple PPG, for the long-term aspects of skin temperature and blood flow variations at different tissue depths, and especially to investigate whether the presence of the probe affects the temperature. Measurements of temperature and blood flow were performed over 60 min on the lower back of ten subjects, lying on a mattress. The surface temperature of the skin was also measured before and after the 60 min period, and repeated with three probe configurations with the probe switched on, turned off and in the absence of a probe. A general increase in the blood flow was found to occur during the 60 min interval at all depths reached by this probe, but with variations over time. No difference was found in temperatures recorded for the different probe configurations. According to our measurements, the presence of the probe does not affect the skin surface temperature at 60 min. Our investigation shows that skin temperature can be expected to increase and approach the body core temperature by just lying in supine position on the mattress. The increase in temperature and blood flow that is known to occur, possibly attributable to pressure-induced vasodilatation, must be taken into consideration when performing these kinds of measurements.

  • 36.
    Hagblad, Jimmie
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Folke, Mia
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Lindberg, Lars-Göran
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Lindén, Maria
    Mälardalens högskola, Akademin för innovation, design och teknik.
    A probe combining two optical techniques for monitoring of blood flow in different vascular depths - investigation of interference2010Inngår i: pHealth 2010: 7th International Conference on Wearable Micro and Nano Technologies for Personalized Health, Berlin, Germany, 2010Konferansepaper (Fagfellevurdert)
  • 37.
    Hagblad, Jimmie
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Folke, Mia
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Lindberg, Lars-Göran
    Linköpings Universitet, IMT.
    Lindén, Maria
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Assessment of the optical interference in a PPG-LDF system used for estimation of tissue blood flow2011Inngår i: IFMBE PROCEEDINGS: 15th Nordic-Baltic Conference on Biomedical Engineering and Medical Physics, NBC 2011; Aalborg; 14 June 2011 through 17 June 2011 / [ed] Kim Dremstrup, 2011Konferansepaper (Fagfellevurdert)
  • 38.
    Hagblad, Jimmie
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Folke, Mia
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Lindberg, Lars-Göran
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Lindén, Maria
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Interference free monitoring of blood flow at multiple depths2010Konferansepaper (Fagfellevurdert)
  • 39.
    Hagblad, Jimmie
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Folke, Mia
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Lindberg, Lars-Göran
    Linköpings Universitet, IMT.
    Lindén, Maria
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Long-term monitoring of blood flow at different depths using LDF and PPG - issues to considerManuskript (preprint) (Annet vitenskapelig)
  • 40.
    Hagblad, Jimmie
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Folke, Mia
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Lindén, Maria
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Long term monitoring of blood flow at multiple depths – observations of changes2012Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Detecting reduced circulation, which is a major factor in the development of pressure ulcers, can be done using optical methods. PPG and LDF can be combined and used to evaluate blood flow at different depths. In this study the use of a probe combining PPG and LDF to monitor multiple tissue depths is evaluated. The effects on blood flow and temperature without additional provocation was examined. Measurements were performed during 60 min and the use of an active probe was compared with the use of a semi-active probe turned off a major part of the time. Changes in temperature and blood flow using these probe configurations (active and semi-active probe) are compared; four different 5 min segments during a 60 min measurement. A general increase in both temperature and blood flow is found but this increase could not be concluded to occur due to the light sources of the probe.

  • 41.
    Hagblad, Jimmie
    et al.
    Mälardalens högskola, Akademin för hälsa, vård och välfärd.
    Folke, Mia
    Mälardalens högskola, Akademin för hälsa, vård och välfärd.
    Lindén, Maria
    Mälardalens högskola, Akademin för hälsa, vård och välfärd.
    Long term monitoring of blood flow at multiple depths - observations of changes.2012Inngår i: Studies in Health Technology and Informatics, ISSN 0926-9630, E-ISSN 1879-8365, Vol. 177, s. 107-112Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Detecting reduced circulation, which is a major factor in the development of pressure ulcers, can be done using optical methods. PPG and LDF can be combined and used to evaluate blood flow at different depths. In this study the use of a probe combining PPG and LDF to monitor multiple tissue depths is evaluated. The effects on blood flow and temperature without additional provocation was examined. Measurements were performed during 60 min and the use of an active probe was compared with the use of a semi-active probe turned off a major part of the time. Changes in temperature and blood flow using these probe configurations (active and semi-active probe) are compared; four different 5 min segments during a 60 min measurement. A general increase in both temperature and blood flow is found but this increase could not be concluded to occur due to the light sources of the probe.

  • 42.
    Hagblad, Jimmie
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Folke, Mia
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Lindén, Maria
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Temperatureffekter vid användandet av blodflödesprob med ppg och ldf2012Inngår i: Medicinteknikdagarna 2012 Programbok, 2012Konferansepaper (Fagfellevurdert)
    Abstract [en]

    För att utvärdera blodflöde kan optiska metoder användas. Denna studie har genomförts för att undersöka eventuella temperatureffekter pga ljuskällorna i en optisk prob som baseras på PPG och LDF. Temperaturförändringar vid två olika mätscenarion jämfördes. Skillnader i temperaturökning kan ses, men resultatet indikerar att påverkan från ljuset endast utgör en liten del av den totala ökningen.

  • 43.
    Hagblad, Jimmie
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Folke, Mia
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Lindén, Maria
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Wireless ECG-monitoring during daily activities2008Konferansepaper (Fagfellevurdert)
  • 44.
    Hagblad, Jimmie
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Lindberg, Lars-Göran
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Kaisdotter Andersson (Jonsson), Annika
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Bergstrand, Sara
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Lindgren, Margareta
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Ek, Anna-Christina
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Folke, Mia
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Lindén, Maria
    Mälardalens högskola, Akademin för innovation, design och teknik.
    A technique based on laser Doppler flowmetry and photoplethysmography for simultaneously monitoring blood flow at different tissue depths2010Inngår i: Medical and Biological Engineering and Computing, ISSN 0140-0118, E-ISSN 1741-0444, Vol. 48, nr 5, s. 415-422Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The aim of this study was to validate a non-invasive optical probe for simultaneous blood flow measurement at different vascular depths combining three photoplethysmography (PPG) channels and laser Doppler flowmeter (LDF). Wavelengths of the PPG were near-infrared 810 nm with source-to-detector separation of 10 and 25 mm, and green 560 nm with source-to-detector separation of 4 mm. The probe is intended for clinical studies of pressure ulcer aetiology. The probe was placed over the trapezius muscle, and depths from the skin to the trapezius muscle were measured using ultrasound and varied between 3.8 and 23 mm in the 11 subjects included. A provocation procedure inducing a local enhancement of blood flow in the trapezius muscle was used. Blood flows at rest and post-exercise were compared. It can be concluded that this probe is useful as a tool for discriminating between blood flows at different vascular tissue depths. The vascular depths reached for the different channels in this study were at least 23 mm for the near-infrared PPG channel (source-to-detector separation 25 mm), 10-15 mm for the near-infrared PPG channel (separation 10 mm), and shallower than 4 mm for both the green PPG channel (separation 4 mm) and LDF.

  • 45.
    Hagblad, Jimmie
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Lindberg, Lars-Göran
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Kaisdotter Andersson (Jonsson), Annika
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Bergstrand, Sara
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Lindgren, Margareta
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Ek, Anna-Christina
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Folke, Mia
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Lindén, Maria
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Simultan registrering av blodflode pa flera djup2009Inngår i: Medicinteknikdagarna, Vasteras, 2009Konferansepaper (Fagfellevurdert)
  • 46.
    Hellstrom, Per Anders Rickard
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Carlén Eriksson, Lennie
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Scharff Willners, Jonatan
    Folke, Mia
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Ekström, Martin
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Intelligent Wireless Body Area Network System for Human Motion Analysis2015Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Human motion analysis provides several important applications. Examples are fall risk assessment, sports biomechanics, physical activity monitoring and rehabilitation. This work in progress paper proposes an intelligent wireless body area network system for motion and gait symmetry analysis. A Bluetooth network with accelerometers, gyroscopes and in-shoe force sensing resistors gathers data and sends it to a web server after intelligent pre-processing and filtering. The system is flexible and adaptable for different use cases including combinations of gait analysis, gait symmetry and pressure measurements between foot and shoe.

  • 47.
    Hellstrom, Per Anders Rickard
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Folke, Mia
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Carried Weight Affects Walking Speed Monitoring with the IngVaL System2019Inngår i: The Sixteenth International Conference on Wearable Micro and Nano Technologies for Personalized Health, pHealth 2019, June 10-12, Studies in health technology and informatics, volume 261, pages 317-320, 2019 / [ed] Bernd Blobel, Mauro Giacomini, Nieuwe Hemweg 6B 1013 BG Amsterdam, The Netherlands: NLM (Medline) , 2019, Vol. 261, s. 317-320Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Earlier work has shown that the IngVaL pedobarography system can estimate walking speed during indoor walking using only three forefoot sensors. The aim of this study was to examine if monitoring of walking speed using data from these three forefoot sensors is affected of the weight a person carries, if the person performs a walk in a set speed on the treadmill. Shoe insoles with force sensing resistors were connected to an electronic unit for signal conditioning and sampling and then the data was sent via Bluetooth to a tablet. Fifteen test persons walked five times each carrying five different weights on the treadmill at 1 m/s. The force-time integrals for the sum of the three forefoot sensors were calculated. This study shows that the force-time integrals for the three forefoot sensors shows a linear relationship with the carried weight as long as the person is not fatigued.

  • 48.
    Hellstrom, Per Anders Rickard
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    FOLKE, MIA
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Monitoring of Carried Weight During Walk Using a Wearable Pedobarography System2019Inngår i: 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, s. 5-8Konferansepaper (Fagfellevurdert)
    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.

  • 49.
    Hellstrom, Per Anders Rickard
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Folke, Mia
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Ekström, Martin
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Wearable Weight Estimation System2015Inngår i: Procedia Computer Science, vol. 64, 2015, Vol. 64, s. 146-152Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Heavy working conditions, as well as sedentary behaviour, are risk factors for health. There is a lack of wearable measurement systems for monitoring carried loads while walking. Pedobarography, the study of force fields acting between the plantar surface of the foot and a supporting surface, is supposed to be useable for estimating carried loads. Purpose. The aim of this paper is to present a novel method for selecting appropriate measurement samples for weight estimation of carried load during walk and a wearable system, based on pedobarography, consisting of commercial off the shelf components. The main idea is to choose samples when half of the total weight is on the forward sensors and the other half is on the heel sensor “equipoise” in one foot while the other foot not touches the ground. Methods. The system consists of insoles with force sensing resistors, data acquisition with IOIO-OTG and analysis in Excel. Each subject was weighed on an electronic floor scale. Three walks were performed on level ground. The first walk without any added load and then with two increases of carried load. Equipoise was defined as having half the weight distributed on the heel and the other half over the metatarsal pad. An equipoise value of 0.5 represents equilibrium regarding the weight distribution on one foot, with the other foot in the air. Samples were chosen in the equipoise region of 0.5±0.1 and then the average of the samples collected during one minute estimated the total weight. Results. The system can detect increases in carried loads but has a tendency to overestimate them. The estimated value was always larger with increased weight but the system was not always linear. The average overestimation error was 16.7 kg. Discussion. This study shows that this type of wearable system is usable for estimating carried load during walk after calibration of the system to the body weight force distribution on the sensors. There is still need for future development to obtain real-time analysis and direct feedback. A smaller and lighter measurement system is also desirable. Conclusion. This study shows that the novel method, equipoise, is usable for selecting appropriate measurement samples for weight estimation of carried load during walk. This study also shows that the wearable system, consisting of commercial off the shelf components, can be used for these measurements. However, there is a tendency to overestimate the loads.

  • 50.
    Hellstrom, Per Anders Rickard
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Åkerberg, Anna
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Ekström, Martin
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    FOLKE, MIA
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system. Mälardalens högskola, Akademin för hälsa, vård och välfärd.
    Evaluation of the IngVaL Pedobarography System for Monitoring of Walking Speed2018Inngår i: Healthcare Informatics Research, ISSN 2093-3681, E-ISSN 2093-369X, ISSN 2093-3681, Vol. 24, nr 2, s. 118-124Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Objectives

    Walking speed is an important component of movement and is a predictor of health in the elderly. Pedobarography, the study of forces acting between the plantar surface of the foot and a supporting surface, is an approach to estimating walking speed even when no global positioning system signal is available. The developed portable system, Identifying Velocity and Load (IngVaL), is a cost effective alternative to commercially available pedobarography systems because it only uses three force sensing resistors. In this study, the IngVaL system was evaluated. The three variables investigated in this study were the sensor durability, the proportion of analyzable steps, and the linearity between the system output and the walking speed.

    Methods

    Data was collected from 40 participants, each of whom performed five walks at five different self-paced walking speeds. The linearity between the walking speed and step frequency measured with R2 values was compared for the walking speed obtained ‘A’ only using amplitude data from the force sensors, ‘B’ that obtained only using the step frequency, and ‘C’ that obtained by combining amplitude data for each of the 40 test participants.

    Results

    Improvement of the wireless data transmission increased the percentage of analyzable steps from 83.1% measured with a prototype to 96.6% for IngVaL. The linearity comparison showed that the methods A, B, and C were accurate for 2, 15, and 23 participants, respectively.

    Conclusions

    Increased sensor durability and a higher percentage of analyzed steps indicates that IngVaL is an improvement over the prototype system. The combined strategy of amplitude and step frequency was confirmed as the most accurate method.

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