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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.
    Abtahi, Farhad
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Ergonomics. Karolinska Inst, Inst Environm Med, S-17165 Stockholm, Sweden..
    Lu, Ke
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Ergonomics.
    Diaz-Olivares, Jose A.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Ergonomics.
    Forsman, Mikael
    Karolinska Inst, Inst Environm Med, S-17165 Stockholm, Sweden..
    Seoane, Fernando
    Karolinska Inst, Dept Clin Sci Intervent & Technol, Halsovagen 7, S-14157 Stockholm, Sweden.;Univ Boras, Swedish Sch Text, Allegatan 1, S-50190 Boras, Sweden.;Karolinska Univ Hosp, Dept Biomed Engn, S-17176 Solna, Sweden..
    Lindecrantz, Kaj
    Karolinska Inst, Inst Environm Med, S-17165 Stockholm, Sweden.;Univ Boras, Sci Pk,Allegatan 1, S-50190 Boras, Sweden..
    Wearable Sensors Enabling Personalized Occupational Healthcare2018In: INTELLIGENT ENVIRONMENTS 2018 / [ed] Chatzigiannakis, I Tobe, Y Novais, P Amft, O, IOS PRESS , 2018, p. 371-376Conference paper (Refereed)
    Abstract [en]

    This paper presents needs and potentials for wearable sensors in occupational healthcare. In addition, it presents ongoing European and Swedish projects for developing personalized, and pervasive wearable systems for assessing risks of developing musculoskeletal disorders and cardiovascular diseases at work. Occupational healthcare should benefit in preventing diseases and disorders by providing the right feedback at the right time to the right person. Collected data from workers can provide evidence supporting the ergonomic and industrial tasks of redesigning the working environment to reduce the risks.

  • 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.
    Dahlqvist, Camilla
    et al.
    Lund Univ, Dept Lab Med, Div Occupat & Environm Med, SE-22185 Lund, Sweden..
    Nordander, Catarina
    Lund Univ, Dept Lab Med, Div Occupat & Environm Med, SE-22185 Lund, Sweden..
    Forsman, Mikael
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Ergonomics.
    Enquist, Henrik
    Lund Univ, Dept Lab Med, Div Occupat & Environm Med, SE-22185 Lund, Sweden..
    Self-recordings of upper arm elevation during cleaning - comparison between analyses using a simplified reference posture and a standard reference posture2018In: BMC Musculoskeletal Disorders, ISSN 1471-2474, E-ISSN 1471-2474, Vol. 19, article id 402Article in journal (Refereed)
    Abstract [en]

    Background To reduce ergonomic risk factors in terms of awkward and constrained postures and high velocities, it is important to perform adequate risk assessments. Technical methods provide objective measures of physical workload. These methods have so far mainly been used by researchers. However, if written instructions how to apply the sensors and how to adopt the reference posture are provided, together with triaxial accelerometers, it may be possible for employees to record their own physical workload. The exposure in terms of e.g. upper arm elevations could then easily be assessed for all workers in a workplace. The main aims of this study were: 1) to compare analyses for self-recording of upper arm elevation during work using a simplified reference posture versus using a standard reference posture, and 2) to compare the two reference postures.MethodsTwenty-eight cleaners attached an accelerometer to their dominant upper arm and adopted a simplified reference according to a written instruction. They were thereafter instructed by a researcher to adopt a standard reference. Upper arm elevations were recorded for 2 or 3 days. Each recording was analysed twice; relative to the simplified reference posture and relative to the standard reference posture. The group means of the differences in recorded upper arm elevations between simplified and standard reference analyses were assessed using Wilcoxon signed ranks test. Furthermore, we calculated the group mean of the differences between the simplified reference posture and the standard reference posture.ResultsFor arm elevation during work (50(th) percentile), the group mean of the differences between the two analyses was 0.2 degrees (range-7 - 10 degrees). The group mean of the differences between the two references was 9 degrees (range 1-21 degrees). The subjects were able to follow the instructions in the protocol and performed self-recording of upper arm elevation and velocity.ConclusionsThe small difference between the two analyses indicates that recordings performed by employees themselves are comparable, on a group level, with those performed by researchers. Self-recordings in combination with action levels would provide employers with a method for risk assessment as a solid basis for prevention of work-related musculoskeletal disorders.

  • 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.
    Eliasson, Kristina
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Ergonomics. Uppsala Univ, Dept Med Sci Occupat & Environm Med, Uppsala, Sweden.;Uppsala Univ Hosp, Uppsala, Sweden..
    Carl, Lind
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Ergonomics.
    Nyman, Teresia
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Ergonomics. Uppsala Univ, Dept Med Sci Occupat & Environm Med, Uppsala, Sweden.;Uppsala Univ Hosp, Uppsala, Sweden..
    Factors influencing ergonomists' use of observation-based risk-assessment tools2019In: Work: A journal of Prevention, Assessment and rehabilitation, ISSN 1051-9815, E-ISSN 1875-9270, Vol. 64, no 1, p. 93-106Article in journal (Refereed)
    Abstract [en]

    BACKGROUND: Several observation-based risk-assessment tools have been developed in recent decades. Studies reporting their use often focus only on the user, the ergonomist. The influence of context and the attributes of the tools may also affect the use but are factors that are seldom considered. OBJECTIVE: The aim of the present study was to explore the process of risk-assessment assignments and to identify factors influencing the use of research-based observation-based risk-assessment tools among Swedish ergonomists, with a background as reg. physiotherapists, employed in Occupational Health Services (OHS). METHODS: A web-based questionnaire (n = 70) was combined with semi-structured interviews (n = 12). RESULTS: There was limited use of several observation-based risk-assessment tools. Furthermore, the results showed that ergonomics risk-assessment assignments are most commonly initiated reactively and that interventions were seldom evaluated. Factors that influence use are related both to the ergonomist and to the attributes of the tools as well as to contextual factors assigned to authorities, and internal organisations both within occupational health service companies and client companies. CONCLUSION: There was a lack of systematic approaches in ergonomics risks assessment and low use and knowledge of risk-assessment tools. This indicates that there is a need to support OHS companies in implementing systematic tools in their practice.

  • 8.
    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.

  • 9.
    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.

  • 10.
    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.

  • 11.
    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.

  • 12.
    Kransvik, Carina
    KTH, School of Technology and Health (STH).
    Att praktisk tillämpa ”SAM- testet” i skyddskommittén med perspektiven ålder, genus och funktionsnedsättning: - och utvärdera om det kan vara ett stöd för att utveckla ett hållbart arbetsliv2017Independent thesis Advanced level (degree of Master (One Year)), 40 credits / 60 HE creditsStudent thesis
    Abstract [en]

    The government writes that "A sustainable working life requires continuous focus on a good working environment throughout the entire working life". Exercising a systematic work environment (SAM) is an effective tool and a good way to create a sustainable working life. The Safety Committee shall closely monitor developments in matters relating to protection against ill health and accidents. The problem formulation describes the research and writing of many reports within Sweden and at EU level on a sustainable working life, but the experience is that few companies are working on a sustainable working life in the systematic work environment work. The purpose of the thesis was to apply the "SAM test" practically to evaluate if it could be a support through dialogue for protection committees in developing a sustainable working life with the perspective of age, gender and disability.

    The method was to provide a facilitator with information on dialogue and sustainable working life at a protection committee meeting. Then let the group respond to the "SAM test" with a sustainable working life and perspective gender, age and disability in mind. The facilitator observes the group while responding to the questions as well as influencing the group to think about sustainable work by using the dialogue as a tool. The purpose, among other things, was to see if they would respond in consensus and target the group towards sustainable work.

    The result showed that the "SAM Test"is a good tool for companies to use in their work towards a sustainable work life. The” SAM-testet” needs to develop the comments and actions in the action plan and add more links to a sustainable working life. This is needed together with education on sustainable working life and dialogue. The company needs to create a consensus for a sustainable working life and, in the context of risk assessments, increase knowledge in sustainable working life. Corporate health care needs knowledge of the three perspectives; age, gender and disability as well as dialogue. Researchers also need to gather good materials and support companies in the work towards for a sustainable working life.

    Thoughts about continued work: A natural next step in a continued work would be to follow a company in its quest for a sustainable working life. I would then be able to study which the obstacles are and how to remove them. Another way would be to join the development and design of the “SAM Test” tool as a tester.

  • 13.
    Lindergård, Eli
    et al.
    KTH, School of Technology and Health (STH).
    Månbris, Mathias
    KTH, School of Technology and Health (STH).
    Progressiva glasögons inverkan på huvudposition hos bildskärmsanvändare2017Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Introduction – Musculoskeletal disorders of the neck and shoulders are common occupational diseases among VDU operators. This causes individual suffering with high costs for society at around 0.5% to 2% of a countries GDP, as well as for companies, that besides high costs also risk a poorer production and quality. There is a concern that VDU operators with progressive lenses have an increased head extension and Forward head posture. However, Few comparative studies have been made on head extension and Forward head posture on subjects with progressive lenses and even fewer with subjects in their natural working environment. Aim – In this study, the aim was to, in the subjects own natural working environment, investigate whether there is a connection between the concept of poor posture in regards of FHP and HE, and VDU operators in the use of progressive lenses, compared to VDU operators without progressive lenses. Materials – The data was collected from seven different companies in the Greater Stockholm area during the period March-April 2017. The test group consisted of 3 men and 7 women with an average age of 57.80 years (± 8.18). The time spent using progressive lenses was 5.85 years (± 5.59). The control group consisted of 4 men and 6 women with an average age of 55.90 years (± 3.60). Method - The subjects were photographed with a smartphone on a leveled tripod, sitting at their own desks in front of their own monitors. Three photos were taken within 5 minutes on each subject. The subjects did not know exactly when the photographs were taken. A mobile application was used to extract angles for HE and FHP measurements. The mean values were then used for further analysis with a two-independent sample test. Results – The test group's mean head protrusion, TFHP was 42.20° (±7.15°). The test group's angle for measuring the head extension, THE, had an average of 17.73° (±5.55°). The control group's mean head protrusion, KFHP was 40.87° (±7.53°). The control group's mean of the head extension, KHE was 11.53° (±7.42°). The correlation between progressive lenses and FHP was not significant (p = 0.739), nor was the correlation between progressive lenses and HE significant (p = 0.063). Conclusion – The results of the study showed no statistically significant correlation that VDU operators in the subject's natural working environment with progressive lenses have a higher degree of FHP or HE than VDU operators without progressive lenses in relation to the vertical- and horizontal line respectively. On the other hand, they had a trend towards a higher HE than VDU operators without progressive lenses with a p-value of 0.063.

  • 14.
    Mazaheri, Ava
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH).
    Ergonomic Evaluation of Power Tool Use at Different Task and Tool Related Conditions Using a Mechanical Test Rig, Electromyography and Subjective Evaluations2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Workers within production and assembly lines are often exposed to ergonomically unfavorable tasksand conditions. Reaction forces and reaction torques generated by industrial power tools may causenot only discomfort but also health issues and injury. The forceful tasks in combination with highlyrepetitive hand-arm motions and prolonged tool use paves the way for loss in workforce capacitywhich in turn can lead to great losses in productivity and product quality. An umbrella term for themany injuries and diseases that may arise from the use of such tools is Cumulative Trauma Disorders(CTD).This study aimed to investigate the ergonomic effect of power tool use for various tool and taskrelated conditions. The study required the setup of a test rig with a simulated handle of the tool. Theergonomic impact was assessed by measuring the torques associated with different tighteningstrategies, as well as measuring the angular displacement of the tool handle. By varying the jointstiffness and workplace orientation, the complexity of the task was varied and thus quantified.Measurements of muscle activity during each tightening procedure provided a quantification of thephysiological impact on the operator. By combining the measurements on the operator withsubjective assessment of perceived exertion and discomfort, a more holistic perspective on thetightening procedure was obtained.The results obtained from the study stressed the negative impact on the operator which the QuickStep tightening strategy on medium hard joints implies, regardless of workspace orientation. TheTurbo Tight and Tensor Pulse tightening strategies turned out to generate the lowest reactiontorques and handle deflections, regardless of joint stiffness and workspace orientation. The findingsfrom the muscle activity measurements in combination with the subjective evaluation methodsfurther confirmed the mildness of the Turbo Tight and Tensor Pulse strategies. Moreover, horizontalworkspace resulted in lower tool handle deflection compared to vertical workspace for all tighteningstrategies and joint stiffnesses.

  • 15.
    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.

  • 16.
    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.

  • 17.
    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.

  • 18.
    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.

  • 19.
    Yang, Liyun
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Ergonomics.
    Abtahi, Farhad
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Ergonomics.
    Eklund, Jörgen
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Ergonomics.
    Hanson, Lars
    School of Engineering Science, University of Skövde.
    Lindecrantz, Kaj
    KTH.
    Forsman, Mikael
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Ergonomics.
    Carl, Lind
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Ergonomics.
    Smart workwear system with real-time vibrotactile feedback for improving postural behaviour in industry2019In: From research to evidence based sustainable interventions and practices: Book of Abstracts, Bologna, Italy, 2019, p. 160-Conference paper (Refereed)
  • 20.
    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.

1 - 20 of 20
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