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  • 1. Abtahi, Farhad
    et al.
    Forsman, Mikael
    Diaz-Olivazrez, Jose A.
    KTH, School of Technology and Health (STH).
    Yang, Liyun
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Ergonomics.
    Lu, Ke
    KTH, School of Technology and Health (STH).
    Eklund, Jörgen
    KTH, School of Technology and Health (STH).
    Lindecrantz, Kaj
    KTH, School of Technology and Health (STH).
    Seoane, Fernando
    Teriö, Heikki
    Mediavilla Martinez, Cesar
    Aso, Santiago
    Tiemann, Christian
    Big Data & Wearable Sensors Ensuring Safety and Health @Work2017In: GLOBAL HEALTH 2017, The Sixth International Conference on Global Health Challenges, 2017Conference paper (Refereed)
    Abstract [en]

    —Work-related injuries and disorders constitute a major burden and cost for employers, society in general and workers in particular. We@Work is a project that aims to develop an integrated solution for promoting and supporting a safe and healthy working life by combining wearable technologies, Big Data analytics, ergonomics, and information and communication technologies. The We@Work solution aims to support the worker and employer to ensure a healthy working life through pervasive monitoring for early warnings, prompt detection of capacity-loss and accurate risk assessments at workplace as well as self-management of a healthy working life. A multiservice platform will allow unobtrusive data collection at workplaces. Big Data analytics will provide real-time information useful to prevent work injuries and support healthy working life

  • 2.
    Adawi, Rahim
    University of Skövde, School of Engineering Science.
    Preventing fatal effects of overworking: Product design solution2018Independent thesis Basic level (university diploma), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    “Overworking to death” is a phenomenon that has been noticeable in developing countries. The cause of death is mainly through ischemic strokes. While the victims’ occupations differed, they all shared a common characteristic, being positioned in a sedentary work, ranging from IT workers to doctors. This project’s aim was to develop a product that prevented or decreased the strokes that derived from sedentary overwork. This was mainly tackled by preventing one of the three causes of developing blood props, slowed blood flow. In order to gather rich data of the phenomenon, a qualitative study was conducted in China, during two months. By doing an extensive structured sampling, information rich data could be gathered during a short period of time. Data were derived from observations, questionnaires and an interview, which then was interpreted to customer needs and the final product specification. The final product became a trouser with an in built dynamic compression mechanic, that can compress the veins mostly during sitting activities, in order to prevent blood stasis. The compression mechanic works like the Chinese finger trap; compressing the calves while sitting and stretching the legs forward. It is made only out of polysaccharides fibres; cotton and corn.

  • 3.
    Bergstrand, Maria
    KTH, School of Technology and Health (STH), Ergonomics.
    Styckares arbetsmiljö: En studie om knivskärpa, olika knivstålskvaliteter, arbetssätt, samt fysisk ansträngning2011Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Sammanfattning

     

    Styckare inom köttbranschen i Sverige ligger sedan länge i toppen av statistiken i Sverige, när det gäller yrken med de högsta relativa frekvenserna av anmälda arbetssjukdomar orsakade av belastningsfaktorer. Kniven är styckarens viktigaste verktyg och om den är slö ökar den fysiska belastningen med ökad risk för både belastningsskador och olycksfall. I denna studie på magisternivå var syftet att undersöka sambanden mellan knivens skärpa, knivens stålkvalitet, effekten av individens arbetssätt samt den fysiska ansträngningen vid styckning av nötkött. 12 personer vid två olika företag deltog i studien, under normalt arbete med styckning vid enkelbord under tre arbetsdagar. Tre olika knivstålskvaliteter utvärderades. Mätning av knivskärpa skedde med mätapparat Anago, samt med subjektiva skattningar enligt visuell analog skala (VAS). Tiden som kniven användes innan byte användes också som ett mått på hur länge skärpan kunde bibehållas. Ansträngningen hos styckarna undersöktes med mätning av hjärtfrekvensen under arbete, samt med skattning av ansträngning i händer och armar enligt VAS. Slutligen mättes eventuellt obehag/besvär före och under arbete med skattning enligt VAS.

     

    Det tycks som om det knivstål som var hårdare och inte finns på marknaden fungerade sämst, medan de övriga två var likvärdiga. Det finns indikationer på att det hårdare knivstålet påverkar andra egenskaper negativt, framförallt känslan av knivens följsamhet.

    Det föreligger en signifikant skillnad mellan olika individer i förmågan att bibehålla knivskärpa över tid, och de med obehag/besvär byter kniv oftare. Ytterligare studier krävs för att klargöra vad skillnaderna beror på, men sannolikt har både styckarens arbetsteknik, och företagets och individens rutiner för knivvård betydelse. Förbättrad utbildning inom dessa områden rekommenderas. Utvärderingen av knivtid indikerar att en styckare behöver 5-6 knivar per dag för att säkerställa att arbetet sker med vass kniv hela tiden.

    Det finns ett samband mellan dålig knivskärpa och lokal ansträngningskänsla i händer och armar. Något samband mellan knivskärpan och central ansträngning kunde dock inte påvisas i denna studie. Pulsvärdena visade att arbete som styckare innebär en hög belastning på andnings- och cirkulationsapparaten, och att de löper en stor risk att överskrida det rekommenderade gränsvärdet för energetisk belastning. Större undersökningsmaterial krävs dock för att dra säkrare slutsatser angående detta.

  • 4.
    Chen, Janice D.
    et al.
    School of Occupational Therapy and Social Work, Curtin University, Perth 6845, Australia.
    Falkmer, Torbjörn
    Jönköping University, School of Health and Welfare, HHJ. CHILD.
    Parsons, Richard
    School of Occupational Therapy and Social Work, Curtin University, Perth 6845, Australia.
    Buzzard, Jennifer
    Ramsey Health, Hollywood Hospital, Perth 6009, Australia.
    Ciccarelli, Marina
    School of Occupational Therapy and Social Work, Curtin University, Perth 6845, Australia.
    Impact of experience when using the Rapid Upper Limb Assessment to assess postural risk in children using information and communication technologies2014In: Applied Ergonomics, ISSN 0003-6870, E-ISSN 1872-9126, Vol. 45, no 3, p. 398-405Article in journal (Refereed)
    Abstract [en]

    The Rapid Upper Limb Assessment (RULA) is an observation-based screening tool that has been used to assess postural risks of children in school settings. Studies using eye-tracking technology suggest that visual search strategies are influenced by experience in the task performed. This study investigated if experience in postural risk assessments contributed to differences in outcome scores on the RULA and the visual search strategies utilized. While wearing an eye-tracker, 16 student occupational therapists and 16 experienced occupational therapists used the RULA to assess 11 video scenarios of a child using different mobile information and communication technologies (ICT) in the home environment. No significant differences in RULA outcome scores, and no conclusive differences in visual search strategies between groups were found. RULA can be used as a screening tool for postural risks following a short training session regardless of the assessor's experience in postural risk assessments. (C) 2013 Elsevier Ltd and The Ergonomics Society. All rights reserved.

  • 5.
    Dellve, Lotta
    et al.
    Sahlgrenska akademin, Göteborgs universitet.
    Ahlstrom, Linda
    Sandsjö, Leif
    Forsman, Mikael
    Lindegård, Agneta
    Ahlstrand, Chris
    Kadefors, Roland
    Hagberg, Mats
    Myofeedback training and intensive muscular strength training to improve work ability and decrease pain among female workers on long term sick leave with neck pain: A Randomized Controlled Trial2011In: International Archives of Occupational and Environmental Health, ISSN 0340-0131, E-ISSN 1432-1246, Vol. 84, no 3, p. 335-346Article in journal (Refereed)
    Abstract [en]

    The theoretical framework is that muscle tension in the neck is related to insufficient muscular rest and is a risk factor for chronic pain and reduced work ability. Promoting muscle strength and muscle rest may increase work ability and reduce neck pain. To test whether myofeedback training or intensive strength training leads to decreased pain and increased work ability in women on long-term sick leave. This is a randomized controlled trial of two 1-month interventions with myofeedback or muscular strength training in the home environment. Female human service organization workers (n = 60) on long-term (> 60 days) sick leave and with chronic neck pain were followed with self-reported and laboratory-observed data of health, pain, muscular activation, and work ability, at baseline, immediately after the intervention and 3 months after baseline. For both intervention groups, pain was lowered over time compared with the control group. Decreased pain and muscular activity was associated with increased self-rated work ability and with laboratory-observed work ability at 3-month follow-up. Decreased pain was also associated with increased self-rated work ability at 1-month follow-up. Muscular strength training was associated with increased self-rated work ability and mental health. Myofeedback was associated with increased observed work ability and self- rated vitality. The two interventions showed positive results, suggesting that they could be developed for use in health care practice to address pain and work ability. The intensive muscular strength training program, which is both easy to conduct at home and easy to coach, was associated with increased work ability.

  • 6.
    Eklund, Jörgen
    et al.
    KTH, School of Technology and Health (STH), Ergonomics.
    Engkvist, Inga-Lill
    KTH, School of Technology and Health (STH), Ergonomics.
    Karltun, Johan
    Jönköpings tekniska högskola.
    Vogel, Kjerstin
    KTH, School of Technology and Health (STH), Ergonomics.
    Styckarnas arbetssituation: Ett interaktivt forskningprogram för branschstöd och utveckling av åtgärder (Star). dnr 0800142012Report (Other (popular science, discussion, etc.))
  • 7.
    Eklund, Jörgen
    et al.
    KTH, Ergonomi.
    Engkvist, Inga-Lill
    KTH, Ergonomi.
    Karltun, Johan
    Jönköping University, School of Engineering, JTH. Research area Industrial Production.
    Vogel, Kjerstin
    KTH, Ergonomi (Stängd 20130701).
    Styckarnas arbetssituation: Ett interaktivt forskningprogram för branschstöd och utveckling av åtgärder (Star). dnr 0800142012Report (Other academic)
  • 8.
    Gatzounis, Rena
    et al.
    Research Group Experimental Health Psychology, Department of Clinical Psychological Science, Maastricht University, The Netherlands; Research Group Health Psychology, Faculty of Psychology & Educational Sciences, University of Leuven, Belgium.
    Crombez, Geert
    epartment of Experimental-Clinical & Health Psychology, Faculty of Psychology & Educational Sciences, Ghent University, Belgium.
    Schrooten, Martien G. S.
    Örebro University, School of Law, Psychology and Social Work. Department of Experimental-Clinical & Health Psychology, Faculty of Psychology & Educational Sciences, Ghent University, Belgium.
    S. Vlaeyen, Johan W.
    Research Group Experimental Health Psychology, Department of Clinical Psychological Science, Maastricht University, The Netherlands; Research Group Health Psychology, Faculty of Psychology & Educational Sciences, University of Leuven, Belgium.
    A break from pain! Interruption management in the context of pain2018In: Pain management, ISSN 1758-1869Article in journal (Refereed)
    Abstract [en]

    Activity interruptions, namely temporary suspensions of an ongoing task with the intention to resume it later, are common in pain. First, pain is a threat signal that urges us to interrupt ongoing activities in order to manage the pain and its cause. Second, activity interruptions are used in chronic pain management. However, activity interruptions by pain may carry costs for activity performance. These costs have recently started to be systematically investigated. We review the evidence on the consequences of activity interruptions by pain for the performance of the interrupted activity. Further, inspired by literature on interruptions from other research fields, we suggest ways to improve interruption management in the field of pain, and provide a future research agenda.

  • 9.
    Hult, Axel
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH).
    Munguia Chang, Daniel
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH).
    Smartphone Acquisition and Online Visualization of IMU and EMG Sensor Data for Assessment of Wrist Load2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Work-related musculoskeletal disorders constitutes a substantial burden for society, generating individual suffering and financial costs. Quantifying the musculoskeletal stress and establishing exposure-response relationships is an important step in facing this problem.

    Observational methods for assessing exposure in the field of ergonomics have shown poor results, and the technical measurement methods that exists are often complicated to use which limits their scope to scientific purposes.

    This work describes the development of a prototype measurement system aimed to simplify ambulatory measurements of musculoskeletal load, specifically aimed at the wrist and hand. Wearable sensors including Inertial Measurement Units (IMU:s) and Electromyography (EMG) were connected to a smartphone and used for measuring wrist movement and forearm muscle activity. Data sampled in the smartphone was stored online in a cloud database, and a webapplication was developed to visualize work-load exposure.

    Testing under controlled conditions indicated that muscular rest can be measured and classified according to suggested risk thresholds. Accurate angular measurements were difficult to implement because of lacking inter-sensor alignment in the horizontal plane, as well as uncertainties in the Bluetooth protocol.

    Future work should focus on the IMU:s and look to further develop a method of correcting the relative angle error, as well as investigating accurate time synchronization of the two sensors.Alternatively, deriving angular velocities directly from the IMU gyroscopes could be investigated.

  • 10.
    Hyppönen, Hannele
    et al.
    Information Department, National Institute for Health and Welfare, Helsinki, Finland.
    Ammenwerth, Elske
    University for Health Sciences, Medical Informatics and Technology (UMIT), Hall in Tyrol, Austr i a.
    Nøhr, Christian
    Department of Development and Planning, Aalborg, Denmark.
    Faxvaag, Arild
    Norwegian Research Centre for Electronic Patient Records, Trondheim, Norway.
    Walldius, Åke
    KTH, School of Computer Science and Communication (CSC), Media Technology and Interaction Design, MID.
    eHealth indicators: results of an expert workshop2012In: Studies in Health Technology and Informatics, Volume 180: Quality of Life through Quality of Information, I O S Press , 2012, p. 328-332Conference paper (Refereed)
    Abstract [en]

    eHealth indicators are needed to measure defined aspects of national eHealth implementations. However, until now, eHealth indicators are ambiguous or unclear. Therefore, an expert workshop "Towards an International Minimum Dataset for Monitoring National Health Information System Implementations" was organized. The objective was to develop ideas for a minimum eHealth indicator set. The proposed ideas for indicators were classified based on EUnetHTA and De-Lone & McClean, and classification was compared with health IT evaluation criteria classification by Ammenwerth & Keizer. Analysis of the workshop results emphasized the need for a common methodological framework for defining and classifying eHealth indicators. It also showed the importance of setting the indicators into context. The results will benefit policy makers, developers and researchers in pursuit of provision and use of evidence in management of eHealth systems.

  • 11.
    Hägg, Göran M
    et al.
    KTH, School of Technology and Health (STH), Ergonomics.
    Vogel, Kjerstin
    KTH, School of Technology and Health (STH), Ergonomics.
    Karltun, Johan
    McGorry, Raymond
    Knife force differences when cutting meat at different temperatures2012In: NES2012: Ergonomics for Sustainability and Growth / [ed] Ann-Beth Antonsson, Kjerstin Vogel, Göran M Hägg, KTH Royal Institute of Technology, 2012Conference paper (Refereed)
    Abstract [en]

    Introduction

    Meat cutters in abattoirs is a group with high risks for musculoskeletal disorders. A major reason for this is that they exert high hand forces over a great part of the day when cutting meat. Though meat is refrigerated due to hygienic demands, meat temperature can vary. Meat cutters have claimed that knife forces increase with lower temperatures. This study was performed to find out what effects the meat temperature has on cutting forces. In addition, the same issue was addressed for pure fat.

    Method

    To be able to do cuts in meat under controlled conditions while measuring cutting forces, a machine, Anago KST Sharpness Analyzer, was used. The machine normally runs a knife at constant speed through a standardized textile ribbon while the force exerted on the ribbon is recorded over time. For this investigation, the ribbon was replaced by a wooden fixture with a 10 mm wide slot where the knife could pass and where meat samples could be fixed.Meat obtained from hind loin and fat tissue of pork was cut into 5 cm long, 4 cm wide and 2 cm thick samples. The meat fibre orientation was aligned with the long axis of the sample. When fixated in the fixture and the machine was started, the knife made a 4 cm long cut through 2 cm thick meat or fat.One hundred and forty four samples of meat and as many of fat were collected and put overnight in one of three refrigerators with temperatures 2, 7 and 12 °C, 48 in each. Well sharpened standard knifes were used for the tests. The knife was changed after 24 cuts. During the procedure samples were taken directly from the refrigerator and put into the fixture and tested immediately. The sample order was generally 2, 7, 12 °C to avoid systematic effects of a gradually blunter knife.

    Results

    There were no significant differences in knife forces at the three meat temperatures. The forces for fat were in average about three times higher than the meat forces. There was no significant difference between forces in fat at 7 and 12 °C. However there was a strongly significant difference between these two groups and the 2 °C fat group. The force was about 30% higher compared to the forces at 7 and 12 °C in fat.

    Conclusion

    In the range 2-12 °C there are no differences in meat. For fat there are no differences in the range 7-12 °C while the force increases about 30% when going from 7 to 2 °C.

  • 12.
    Hägg, Göran M
    et al.
    KTH, Ergonomi.
    Vogel, Kjerstin
    KTH, Ergonomi.
    Karltun, Johan
    Jönköping University, School of Engineering, JTH. Research area Industrial Production.
    McGorry, Raymond
    Knife force differences when cutting meat at different temperatures2012In: NES2012: Ergonomics for Sustainability and Growth / [ed] Ann-Beth Antonsson, Kjerstin Vogel, Göran M Hägg, Stockholm: KTH Royal Institute of Technology, 2012Conference paper (Refereed)
    Abstract [en]

    Introduction

    Meat cutters in abattoirs is a group with high risks for musculoskeletal disorders. A major reason for this is that they exert high hand forces over a great part of the day when cutting meat. Though meat is refrigerated due to hygienic demands, meat temperature can vary. Meat cutters have claimed that knife forces increase with lower temperatures. This study was performed to find out what effects the meat temperature has on cutting forces. In addition, the same issue was addressed for pure fat.

    Method

    To be able to do cuts in meat under controlled conditions while measuring cutting forces, a machine, Anago KST Sharpness Analyzer, was used. The machine normally runs a knife at constant speed through a standardized textile ribbon while the force exerted on the ribbon is recorded over time. For this investigation, the ribbon was replaced by a wooden fixture with a 10 mm wide slot where the knife could pass and where meat samples could be fixed.Meat obtained from hind loin and fat tissue of pork was cut into 5 cm long, 4 cm wide and 2 cm thick samples. The meat fibre orientation was aligned with the long axis of the sample. When fixated in the fixture and the machine was started, the knife made a 4 cm long cut through 2 cm thick meat or fat.One hundred and forty four samples of meat and as many of fat were collected and put overnight in one of three refrigerators with temperatures 2, 7 and 12 °C, 48 in each. Well sharpened standard knifes were used for the tests. The knife was changed after 24 cuts. During the procedure samples were taken directly from the refrigerator and put into the fixture and tested immediately. The sample order was generally 2, 7, 12 °C to avoid systematic effects of a gradually blunter knife.

    Results

    There were no significant differences in knife forces at the three meat temperatures. The forces for fat were in average about three times higher than the meat forces. There was no significant difference between forces in fat at 7 and 12 °C. However there was a strongly significant difference between these two groups and the 2 °C fat group. The force was about 30% higher compared to the forces at 7 and 12 °C in fat.

    Conclusion

    In the range 2-12 °C there are no differences in meat. For fat there are no differences in the range 7-12 °C while the force increases about 30% when going from 7 to 2 °C.

  • 13. Jackson, Jennie A.
    et al.
    Mathiassen, Svend Erik
    Wahlstrom, Jens
    Liv, Per
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Medicinska och farmaceutiska vetenskapsområdet, centrumbildningar mm, Centre for Research and Development, Gävleborg.
    Forsman, Mikael
    Digging deeper into the assessment of upper arm elevation angles using 0 Cross Mark standard inclinometry2015In: Applied Ergonomics, ISSN 0003-6870, E-ISSN 1872-9126, Vol. 51, p. 102-103Article in journal (Refereed)
  • 14.
    Jaldestad, Ellen
    et al.
    KTH, School of Technology and Health (STH), Health Systems Engineering, Ergonomics.
    Hansson, Ingrid
    KTH, School of Technology and Health (STH), Health Systems Engineering, Ergonomics.
    Chefsutbildning i Psykosocial Arbetsmiljörond: Utvärdering av en utbildningsinsats inom primär stressprevention2015Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Background: Stress Prevention Project was a pilot project that took place in a global high-tech company during 2012-2014. The aim of the project was to identify the root causes of employees' perceived stress and to develop an approach for preventing these root causes. When the pilot project was completed a decision was taken that the intervention would be implemented throughout the organization. As a prelude to the intervention process all managers and HR personnel participated in a training session in “Psychosocial Work Environment Round”. The training included an introduction to psychosocial factors in the work environment and how these may affect employees, and a review of the questionnaire that was used to identify the psychosocial working environment and how its results should be interpreted.

     

    Aim: The aim of this study is to evaluate the initial training session, whether it is structured in a relevant way and what its content brings the intervention process.

     

    Limitations: The authors have only evaluated the initial training session that is a part of the larger intervention process.

     

    Method: The study was a qualitative interview study of interpretative and reflective approach. A selection of managers from three different training sessions and departments were asked to participate in the study. Participation was voluntary and all information treated confidentially. The interviews were carried out in focus groups of 2-4 participants. In exceptional cases individual interviews were conducted, this was because it was not possible to gather all the managers in the same session due to their different schedules.

     

    Results: The result shows that trainers and participants largely had the same perception regarding the aim and goals of the training session.  All goals were met with one exception.

     

    Despite completed training session several of the participants still felt unsure how to manage and affect the psychosocial work environment in their working group. However, they are satisfied with the training session as well as the intervention process. They consider the training to be important to secure the quality of the intervention. The participant inquire for a follow-up of the training session.

  • 15.
    Jonsson, Bertil
    et al.
    Umeå University, Faculty of Medicine, Department of Surgical and Perioperative Sciences, Surgery.
    Stenlund, Hans
    Umeå University, Faculty of Medicine, Department of Public Health and Clinical Medicine, Epidemiology and Public Health Sciences.
    Svensson, Mats Y
    Björnstig, Ulf
    Umeå University, Faculty of Medicine, Department of Surgical and Perioperative Sciences, Surgery.
    Seat adjustment: capacity and repeatability among occupants in a modern car2008In: Ergonomics, ISSN 0014-0139, E-ISSN 1366-5847, Vol. 51, no 2, p. 232-241Article in journal (Refereed)
    Abstract [en]

    Families in the Western world have a car and several family members share the same car. In this study, 154 participants have adjusted a driver's seat three times. The primary objective was to study intrapersonal repeatability and intraclass correlation (ICC) on seat; length adjustment, backrest angle, seat front edge and seat rear edge adjustment, related to participant age, sex, stature and weight. Length adjustment has the best intrapersonal repeatability within two repetitions, 49 mm and ICC-value 0.87. Females and younger participants (age < 40 years) adjust seats generally more accurately. Females adjust the seat 41 mm more forward, 120 mm compared to men 79 mm counted from 0-starting position. Females sit with more upright seat backrests, 46 degree compared to 43 degrees for males counted from 0-starting position. Females sit higher than males in both the frontal and rear part of the seat cushion.

  • 16.
    Kaladjev, Stojan
    Stockholm University, Centrum för musikpedagogisk forskning (MPC).
    Ergonomi i musikutbildningen: ergonomiska och kognitiva aspekter på instrumentalspel2000Doctoral thesis, monograph (Other academic)
  • 17.
    Knödler, Stephanie
    Umeå University, Faculty of Science and Technology, Umeå Institute of Design.
    eQu riding therapy saddle: focused on children with cerebral palsy2013Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    There doesn´t exist yet a saddle which is mainly designed for therapeutic riding. What the therapist do nowadays is, that they use either normal saddles and add different devices with screws on, or they use a vaulting girth. Both of them are not the ideal solution and a saddle designed for therapeutic riding is needed. The goals were, to design a saddle where the child sits safer on the horse and the exercises can be done smooth, the therapist should have a stressfree job and the horse should feel comfortable through the entire therapy session.

  • 18. Lindström, Fredric
    et al.
    Ren, Keni
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Li, Haibo
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Waye, Kerstin Persson
    Comparison of two methods of voice activity detection in field studies2009In: Journal of Speech, Language and Hearing Research, ISSN 1092-4388, E-ISSN 1558-9102, Vol. 52, no 6, p. 1658-1663Article in journal (Refereed)
    Abstract [en]

    Purpose: To evaluate and compare the performance of 2 methods of voice activity detection (neck-attached accelerometer vs. binaural recordings) in field studies in environments where voice activity normally occurs.

    Method: A group of 11 healthy adults wore recording equipment during their lunch break. We used binary classification to analyze the results from the 2 methods. The output was compared to a gold standard, obtained through listening tests, and the probability for sensitivity (Ps) and false positive (Pf) was rated. The binary classifiers were set for consistent sensitivity of 99%; thus, the lower false positive rate would indicate the method with the better performance.

    Results: The neck-attached accelerometer (Pf = 0.5%) performed significantly (p < .001) better than the binaural method (Pf = 7%).

    Conclusion: The neck-attached accelerometer is more suitable than the binaural method for voice assessments in environments where people are speaking in close proximity to each other and where the signal-to-noise ratio is moderate to low.

  • 19. Milosavljevic, Stephan
    et al.
    Bergman, Frida
    Umeå University, Faculty of Medicine, Department of Community Medicine and Rehabilitation, Physiotherapy.
    Rehn, Börje
    Umeå University, Faculty of Medicine, Department of Community Medicine and Rehabilitation, Physiotherapy.
    Carman, Allan B
    All-terrain vehicle use in agriculture: Exposure to whole body vibration and mechanical shock2010In: Applied Ergonomics, ISSN 0003-6870, E-ISSN 1872-9126, Vol. 41, no 4, p. 530-535Article in journal (Refereed)
    Abstract [en]

    Whole body vibration (WBV) and mechanical shock were measured in 12 New Zealand farmers during their daily use of all-terrain vehicles (ATVs). As per the International Organization for Standardization (ISO) guidelines for WBV exposure, frequencies between 0 and 100Hz were recorded via a seat-pad tri-axial accelerometer during 20min of ATV use. The farmers were also surveyed to estimate seasonal variation in daily ATV usage as well as 7-day and 12-month prevalence of spinal pain. Frequency-weighted vibration exposure and total riding time were calculated to determine the daily vibration dose value (VDV). The daily VDV of 16.6m/s(1.75) was in excess of the 9.1m/s(1.75) action limit set by ISO guidelines suggesting an increased risk of low back injury from such exposure. However, the mean shock factor R, representing cumulative adverse health effects, was 0.31 indicating that these farmers were not exposed to excessive doses of mechanical shock. Extrapolation of daily VDV data to estimated seasonal variations of farmers in ATV riding time demonstrated that all participants would exceed the ISO recommended maximum permissible limits during the spring lambing season, as compared to lower exposures calculated for summer, autumn and winter. Low back pain was the most commonly reported complaint for both 7 day (50%) and 12 month prevalence (67%), followed by the neck (17% and 42%) and the upper back (17% and 25%) respectively. The results demonstrate high levels of vibration exposure within New Zealand farmers and practical recommendations are needed to reduce their exposure to WBV.

  • 20.
    Niemand, Ponthus
    et al.
    Halmstad University, School of Business, Engineering and Science.
    Saladdin, Aya
    Halmstad University, School of Business, Engineering and Science.
    Management of ergonomic aspects in early design phases using virtual reality: Mapping of ergonomic aspects in early design phases, How would mordern technology like VR be used?2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Volvo Group is one of the Worlds leading manufacturer in the categories trucks, busses, construction equipment and engines for the marine and industrial applications. Volvo Group consist of many different brands 10 in total, these are: Volvo Trucks, UD Trucks, Renault Trucks, Mack Trucks, Group Trucks Asia & JVs, Volvo Construction Equipment, Volvo Bus, Volvo Penta, Volvo Financial Services and Governmental Sales. The initiative for the project came from Method and Process Development within Volvo Trucks Tuve Plant, department at Volvo Group Trucks Operations (GTO), which is the part of Volvo Group performing the actual production of the trucks.

    Volvo GTO is located worldwide in several different countries, which leads to different work processes. To standardize a method where the designer (component owner) together with the geometry architect can make a first ergonomics analysis of the concerned component. To make this possible, the project presented a manual on how the component owner should proceed to obtain as good and correct analysis of ergonomics as possible.

    This bachelor thesis makes suggestions for how VR would be helpful in the design phase as an evaluation tool during development of a new product/component or whether improvements should be made to an existing component. The thesis has focused mostly on how the designer and geometry architect can evaluate the ergonomics aspects with VR as a help, already in the design phase.

    The project has investigated two user cases. One of them is presented in this report. This applies to the installation of heat shield, the reason that this particular assembly was chosen is due to its poor ergonomics and accessibility. The project chose to do a RULA-analysis and PLIBEL-analysis. The RULA analysis gave a high total score, 7 out of 7, while PLIBEL was an analysis at the workplace. Both proved to be a good basis for continued work. 

    The study shows that VR is a great tool for analysis of the ergonomics aspects in early design phase. It gives relevant results and has the potential for savings in resources and cost in product development process.

    To improve the results of the thesis, there have been visits on ESI-Group which has sponsored the thesis in the form of VR equipment and workshop. This gave the project members an insight into the possibilities of VR.

  • 21.
    Persson, Lukas
    et al.
    Halmstad University.
    Norén, Johan
    HållRätt: -Hjälp dig hjälpa dig själv Utveckling av ett hållningshjälpmedel för vardagligt bruk2016Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    Society is becoming increasingly digitalized and we spend more and more of awake hours infront electronics, both at home and at work. Our bodies, made for being resilient hunters, are not suited for sitting still an entire day. The static work exhausts the muscles and makes it hard to maintain a correct posture throughout the day, enough time in static positions may result in both interior and exterior damages to the body. The main purposes with the project is to increase the awareness of what horrible consequences that may occur when the body is being exposed to an unhealthy posture, also develop a prototype for a product that will guide the user on the road of getting a better default posture.The product we have developed is primarily aimed at companies, which it will be able to offer their employees a better shot at a healthier life, which will result in reduced number of sick leaves for the companies. We, Johan Norén and Lukas Persson, has in our thesis, HållRätt, developed a prototype for a product that will assist you by encouraging you to improve your posture reduce your chances of getting unwanted injuries. The product is a wearable accessory that will be undetectable by your surroundings, unless you choose to wear over your clothes. The product will be a combination of a helper and personal trainer who will guide the user on the way to a better posture and thus better health and a fuller life.

  • 22.
    Rose, Linda M.
    et al.
    KTH, School of Technology and Health (STH), Health Systems Engineering, Ergonomics.
    Neumann, W. Patrick
    Hägg, Göran M.
    KTH, School of Technology and Health (STH), Health Systems Engineering, Ergonomics.
    Kentta, Göran
    Fatigue and recovery during and after static loading2014In: Ergonomics, ISSN 0014-0139, E-ISSN 1366-5847, Vol. 57, no 11, p. 1696-1710Article in journal (Refereed)
    Abstract [en]

    Subjectively assessed endurance time (ET), resumption time (RT) and perceived discomfort, pain or fatigue (PD), and objectively measured maximum force-exerting capacity were investigated for varying loads and durations of a pushing task with two repeated trials. Beyond the main results quantifying how the load scenario affected ET, RT and PD, three additional results are of note: (1) although the maximum pushing force did not change between trials, shorter ET, longer RT and higher PD indicated accumulation of fatigue in Trial 2; (2) the PD ratings showed a trend with a linear increase during loading and a curvilinear decrease during recovery; and (3) the RT and the load level for different relative loading times were found to have an unexpected U-shaped relationship, indicating lowest fatigue at the intermediate load level. These results can be used to model a more sustainable and productive work-recovery ratio.

  • 23.
    Salomonsson, Angelica
    Halmstad University, School of Business and Engineering (SET), Biological and Environmental Systems (BLESS), Biomechanics and Biomedicine.
    Utveckling av medicintekniskt instrument för mätning av muskelstyrka2013Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Detta examensarbete inom biomekanik var ett produktutvecklingsprojekt av ett medicintekniskt instrument för mätning av statisk muskelstyrka i lårmuskulaturen (quadriceps). Instrumentet utvecklades med utgångspunkt från instrumentet Stig Starke som blivit föråldrat och förfallet. Stig Starke nyttjas främst av sjukgymnaster på Sahlgrenska universitetssjukhuset med syfte att exempelvis utvärdera effekter av sjukgymnastisk behandling. Behovet av en ny version av instrumentet är stort både inom kliniskt arbete och inom forskning. En ny version av instrumentet skulle hjälpa sjukgymnaster och forskare till att kunna fortsätta mäta muskelstyrkan i quadriceps på ett snabbt och enkelt sätt.

    Syftet och målsättningen med detta examensarbete var att utveckla Stig Starke-instrumentet så att mätningar av maximal statisk styrka i lårmuskulaturen (quadriceps), i enheten Newton, kan göras på patienter inom sjukvård och rehabilitering. En problemanalys i form av Workshop gjordes hos användarna på Sahlgrenska universitetssjukhuset. Problemanalysen tillsammans med en förstudie lade grunden för koncept i form av krav och önskemål till nya versionen av instrumentet. Önskemål på användarvänlighet av instrumentet och standardisering av patientens kroppsposition stod högt i prioritering.

    Via dynamisk produktutveckling och biomekaniska metoder där användarna (sjukgymnasterna) var i fokus kunde ett koncept väljas ut och tillverkas till en funktionell prototyp. Sex nyckelord för arbetet är quadriceps, muskelkraft, instrument, antropometri, användarvänlighet och standardisering. Funktionella prototypen visade via produktutvärdering att goda utvecklingsmöjligheter finns för den nya versionen, då den visade på hög användarvänlighet och standardisering. Behovet av en ny version av instrumentet kommer att finnas kvar tills ett likvärdigt instrument som Stig Starke kan tillämpas i verkligheten. 

  • 24.
    Sandström, Anders
    Umeå University, Faculty of Science and Technology, Umeå Institute of Design.
    IMPROVING SELF-RESCUE EQUIPMENT: Can a self-contained self-rescue unit be more comfortable to wear over long periods of time, not damage other equipment and be donned easily?2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    A self-contained self-rescue unit is a device that is used in the mining industry in case of fires or release of toxic gases that depletes or contaminates breathable oxygen in the surrounding atmosphere. These units are the first line of defense by providing oxygen in a closed breathing cycle, allowing personnel to get themselves to safety.

    The goal of this project was to design a unit that is more comfortable to carry during the daily operations in and outside the mines. A unit that is easier to done and less likely to damage the users and/or surrounding mining equipment. It is developed in close collaboration with Atlas Copco, as the main sponsor, as well as Dräger and personnel working at Zink Gruvan Mining. 

    The result is a unit with an operational time of twenty minutes and a reduced size and weight. It’s position can be adjusted to be worn around the waist or the chest, depending on the tasks the user performs, as well as simplifying the donning procedure.

  • 25.
    Vogel, Kjerstin
    et al.
    KTH, School of Technology and Health (STH), Health Systems Engineering, Ergonomics.
    Karltun, Johan
    Jönköpings Tekniska Högskola.
    Eklund, Jörgen
    KTH, School of Technology and Health (STH), Health Systems Engineering, Ergonomics.
    Skarp: Ett utbildningsmaterial i att hålla en kniv vass2014Report (Other (popular science, discussion, etc.))
    Abstract [sv]

    Detta är ett praktiskt verktyg för utbildning av knivanvändare inom industrin.

  • 26.
    Vogel, Kjerstin
    et al.
    KTH, School of Technology and Health (STH), Health Systems Engineering, Ergonomics.
    Karltun, Johan
    Tekniska Högskolan i Jönköping.
    Eklund, Jörgen
    KTH, School of Technology and Health (STH), Health Systems Engineering, Ergonomics.
    Engkvist, Inga-Lill
    KTH, School of Technology and Health (STH), Health Systems Engineering, Ergonomics.
    Improving meat cutters' work: Changes and effects following an intervention2013In: Applied Ergonomics, ISSN 0003-6870, E-ISSN 1872-9126, Vol. 44, no 6, p. 996-1003Article in journal (Refereed)
    Abstract [en]

    Meat cutters face higher risks of injury and musculoskeletal problems than most other occupational groups. The aims of this paper were to describe ergonomics changes implemented in three meat cutting plants and to evaluate effects related to ergonomics on the individual meat cutters and their work. Data was collected by interviews, observations, document studies and a questionnaire (n = 247), as a post intervention study. The changes implemented consisted of reducing knife work to a maximum of 6 h per day and introducing a job rotation scheme with work periods of equal length. Tasks other than traditional meat cutting were added. A competence development plan for each meat cutter and easy adjustment of workplace height were introduced. The questionnaire showed a reduction in perceived physical work load. In general, the changes were perceived positively. Figures from the company showed a positive trend for injuries and sick leave.

  • 27.
    Wramsten Wilmar, Maria
    KTH, School of Technology and Health (STH), Health Systems Engineering, Ergonomics.
    Managers in healthcare organizations and their interactions with the media2016Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    Background: The combination of three forces, the organizations’ desire for visibility, the citizens’ interest in the HSOs and the increasing pressure upon journalists to attract the interest of the audiences have all contributed to the fact that HSO managers nowadays have more interactions with the media than ever before.

    Aim: The aim of this thesis is to gain a deeper knowledge about HSO managers’ interaction with the media; their experience of the interaction, strategies and support.

    Method: The material of the study A was subject to a qualitative research approach along the lines of grounded theory, whereas content analysis was applied to study B.

    Results: The results show how the personal consequences as well as the consequences for their managerial practice vary in accordance with the extent to which the manager, the organization and the media attribute individual focus. The amount of support and from where within the organization the support was offered varied. When the managers did receive support from within their organization, it primarily came from co-workers or subordinates. Any strategies for interactions with the media were rarely organization-wide or even put into writing. Instead, they were defined by the managers themselves along the way.

    Discussion: The managers’ interactions with the media may be influenced both on a managerial and organizational level. Neither manager nor organization seem to profit from an individual focus, at least not in the long term.

    Conclusions: The result indicate the grade of reactions, stand in relation to the level of personification. Also the results suggests that this was influenced by the manager him- or herself, the organization as a whole and by the media. Managers tended to strive for an open and proactive strategy in relation to the media. They did not perceive much support and felt they were expected to handle the interactions with the media all on their own.

  • 28.
    Yang, Liyun
    et al.
    KTH, School of Technology and Health (STH), Health Systems Engineering, Ergonomics.
    Grooten, W. J. A.
    Forsman, M.
    An iPhone application for upper arm posture and movement measurements2017In: Applied Ergonomics, ISSN 0003-6870, E-ISSN 1872-9126, Vol. 65, p. 492-500Article in journal (Refereed)
    Abstract [en]

    There is a need for objective methods for upper arm elevation measurements for accurate and convenient risk assessments. The aims of this study were (i) to compare a newly developed iOS application (iOS) for measuring upper arm elevation and angular velocity with a reference optical tracking system (OTS), and (ii) to compare the accuracy of the iOS incorporating a gyroscope and an accelerometer with using only an accelerometer, which is standard for inclinometry. The iOS-OTS limits of agreement for static postures (9 subjects) were -4.6° and 4.8°. All root mean square differences in arm swings and two simulated work tasks were <6.0°, and all mean correlation coefficients were >0.98. The mean absolute iOS-OTS difference of median angular velocity was <13.1°/s, which was significantly lower than only using an accelerometer (<43.5°/s). The accuracy of this iOS application compares well to that of today's research methods and it can be useful for practical upper arm measurements.

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