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Rhén, I.-M. -. & Forsman, M. (2020). Inter- and intra-rater reliability of the OCRA checklist method in video-recorded manual work tasks. Applied Ergonomics, 84, Article ID 103025.
Open this publication in new window or tab >>Inter- and intra-rater reliability of the OCRA checklist method in video-recorded manual work tasks
2020 (English)In: Applied Ergonomics, ISSN 0003-6870, E-ISSN 1872-9126, Vol. 84, article id 103025Article in journal (Refereed) Published
Abstract [en]

Observation-based risk assessments are often used for evaluation of biomechanical workload and the condition of the workplace ergonomics. However, the inter- and intra-rater reliability of the methods used for the assessments are insufficiently studied. The OCRA checklist method, included as a reference method in the ISO and CEN standards regarding upper limb repetitive risk assessment, was in this study investigated regarding its reliability. Eleven ergonomists were educated within the method. Each ergonomist risk-assessed ten video-recorded manual work tasks, on two occasions. The average inter-rater agreement of the five overall risk levels was 39% and the linearly weighted kappa was 0.43, the intra-rater dittos were 45% and 0.52. Both indicating a moderate reliability, but lower than what could be expected. The levels might be sufficient for coarse surveys. However, for risk assessments before and after an intervention, complementing technical methods should be considered.

Place, publisher, year, edition, pages
Elsevier Ltd, 2020
Keywords
Inter-rater reliability, Intra-rater reliability, Observational methods, Risk assessment, Ergonomics, Reliability, Inter-rater agreements, Inter-rater reliabilities, Observational method, Overall risk level, Reference method, Upper limbs, Work task, article, checklist, interrater reliability, intrarater reliability, manual labor, upper limb, videorecording
National Category
Production Engineering, Human Work Science and Ergonomics
Identifiers
urn:nbn:se:kth:diva-267946 (URN)10.1016/j.apergo.2019.103025 (DOI)000512220600007 ()31987511 (PubMedID)2-s2.0-85075972830 (Scopus ID)
Note

QC 20200401

Available from: 2020-04-01 Created: 2020-04-01 Last updated: 2020-04-01Bibliographically approved
Svenner, A., Fan, X., Forsman, M., Shabo, I., Hallbeck, M. S. & Kjellman, M. (2019). A simulator-based comparison of a novel 3d and a conventional 3d vision system-surgical performance and subjective ratings. Inventions, 4(4), Article ID 58.
Open this publication in new window or tab >>A simulator-based comparison of a novel 3d and a conventional 3d vision system-surgical performance and subjective ratings
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2019 (English)In: Inventions, ISSN 2411-5134, Vol. 4, no 4, article id 58Article in journal (Refereed) Published
Abstract [en]

In laparoscopy, novel three-dimensional laparoscopic vision systems (3D LVS) without glasses (3D−) have been invented. While standard 3D LVS with glasses (3D+) have shown advantages over original two-dimensional systems, quantitative comparisons of surgical performance between 3D− and 3D+ systems are still lacking. The aim is to compare the systems in simulated robotic surgery tasks. In a crossover study, 18 medical students performed four basic laparoscopic tasks in the validated Simball Box simulator with authentic surgical instruments by using the 3D+ and 3D− systems. Performance was measured by the number of errors and the task’s duration. Subjective ratings of perceptions and preference were assessed after each test. There were significant, but still minor, advantages for the conventional 3D+ system regarding spatial orientation and sense of depth. Overall, ten and eight subjects preferred 3D+ and 3D− systems, respectively. No significant differences were found in performance, post-operative physicals or eye symptoms. The novel 3D− system was similar to the conventional 3D+ system regarding performance and overall preference, while there were minor advantages for the 3D+ system in the subjective ratings. Since the 3D− system is a new invention, it should have a higher potential of usability improvements.

Place, publisher, year, edition, pages
MDPI Multidisciplinary Digital Publishing Institute, 2019
Keywords
3D monitor, Glasses-less, Laparoscopy, Validation, Visual ergonomics
National Category
Clinical Medicine
Identifiers
urn:nbn:se:kth:diva-268018 (URN)10.3390/inventions4040058 (DOI)2-s2.0-85074194997 (Scopus ID)
Note

QC 20200322

Available from: 2020-03-22 Created: 2020-03-22 Last updated: 2020-03-22Bibliographically approved
Bodin, T., Berglund, K. & Forsman, M. (2019). Activity in neck-shoulder and lower arm muscles during computer and smartphone work. International Journal of Industrial Ergonomics, 74, Article ID UNSP 102870.
Open this publication in new window or tab >>Activity in neck-shoulder and lower arm muscles during computer and smartphone work
2019 (English)In: International Journal of Industrial Ergonomics, ISSN 0169-8141, E-ISSN 1872-8219, Vol. 74, article id UNSP 102870Article in journal (Refereed) Published
Abstract [en]

Relevance to industry: There is emerging evidence of musculoskeletal problems related to smartphone work and a rapid transition to mobile workplaces, where smartphones are key working tools. Aim: The study's aim was to compare muscle activity during computer work with smartphone work and to see what possible effects ergonomic recommendations for smartphone usage have on muscle activity. Methods: Activity was measured bilaterally from the upper trapezius muscle and from lower arm muscles on the right hand side, on twelve participants with surface electromyography who performed e-mail work on the computer using ergonomic recommendations, smartphone in a self-chosen way of working and on smartphone with ergonomic recommendations. Effects on productivity was not assessed in this study. Results: Activity in m. trapezius and m. extensor digitorum was significantly higher during computer work (p < 0.05) than during the two smartphone usages and activity in m. interossei dorsalis 1 was, vice versa, significantly higher during smartphone work fp < 0.05). Comparison of smartphone in self-chosen way of working and smartphone with ergonomic recommendations showed no significant differences. Conclusions: Previous research has highlighted the benefits of variation of work postures. This paper indicates that replacing the computer with a smartphone gives the trapezius muscle an opportunity to rest.

Place, publisher, year, edition, pages
ELSEVIER, 2019
Keywords
Smartphone, Electromyography, Ergonomic recommendations
National Category
Occupational Health and Environmental Health
Identifiers
urn:nbn:se:kth:diva-266421 (URN)10.1016/j.ergon.2019.102870 (DOI)000503086000020 ()2-s2.0-85074006004 (Scopus ID)
Note

QC 20200123

Available from: 2020-01-23 Created: 2020-01-23 Last updated: 2020-01-23Bibliographically approved
Maimaiti, N., Wang, J., Jin, X., Wang, S., Qin, D., He, L., . . . Wang, H. (2019). Cervical musculoskeletal disorders and their relationships with personal and work-related factors among electronic assembly workers. Journal of Safety Research, 71, 79-85
Open this publication in new window or tab >>Cervical musculoskeletal disorders and their relationships with personal and work-related factors among electronic assembly workers
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2019 (English)In: Journal of Safety Research, ISSN 0022-4375, E-ISSN 1879-1247, Vol. 71, p. 79-85Article in journal (Refereed) Published
Abstract [en]

Introduction: Electronics assembly workers are reported to have a high prevalence of musculoskeletal disorders (MSDs). This study investigated the prevalence of cervical MSDs and the complex relationships between cervical MSDs and individual, physical, psychosocial factors among electronics assembly workers. Methods: In this cross-sectional survey, self-administered questionnaires from 700 workers in electronics manufacturing workshops were analysed. Information concerning musculoskeletal symptoms, personal and work-related factors was collected. Finally, the prevalence of cervical MSDs was computed for different subgroups, and the relationships with different factors were analyzed using logistic regression and structural equation modeling (SEM). Results: The total 12 month prevalence of cervical MSDs among the survey population was 29.4%. Variables of gender, job tenure, twisting head frequently, neck flexion/extension for long time and work required to be done quickly showed significant associations with MSDs in a multivariate logistic regression (P < 0.05). The SEM analysis showed moderate and significant correlations between postural load (gamma = 0.279), gender (gamma = 0.233) and cervical MSDs, while there were weak but significant correlations between vibration (gamma = 0.024), work stress (gamma = 0.126), job tenure (gamma = 0.024) and cervical MSDs. Both work stress and vibration affected the MSDs indirectly through postural load. Conclusions: The logistic regression results support previous general epidemiological MSD studies, and indicates that individual, physical, and psychosocial factors are related to cervical MSDs. The SEM provides a better approximation of the complexity of the relationship between risk factors and cervical MSDs. Improving awkward postures may be effective ways to control the influence of occupational stressors or vibration on MSDs. Practical Applications: The study is to improve prevention of MSDs among electronics assembly workers and promote their occupational health.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD, 2019
Keywords
Cervical musculoskeletal disorders, risk factors, structural equation modeling, electronic assembly workers, occupational health
National Category
Health Sciences
Identifiers
urn:nbn:se:kth:diva-267187 (URN)10.1016/j.jsr.2019.09.018 (DOI)000506723600008 ()31862047 (PubMedID)2-s2.0-85075201405 (Scopus ID)
Note

QC 20200204

Available from: 2020-02-04 Created: 2020-02-04 Last updated: 2020-02-04Bibliographically approved
Lind, C., Forsman, M. & Rose, L. (2019). Development and evaluation of RAMP I – a practitioner’s tool for screening of musculoskeletal disorder risk factors in manual handling. International Journal of Occupational Safety and Ergonomics (JOSE), 25(2), 165-180, Article ID 10.1080/10803548.2017.1364458.
Open this publication in new window or tab >>Development and evaluation of RAMP I – a practitioner’s tool for screening of musculoskeletal disorder risk factors in manual handling
2019 (English)In: International Journal of Occupational Safety and Ergonomics (JOSE), Vol. 25, no 2, p. 165-180, article id 10.1080/10803548.2017.1364458Article in journal (Refereed) Published
Abstract [en]

RAMP I is a screening tool developed to support practitioners in screening for work-related musculoskeletal disorder riskfactors related to manual handling. RAMP I, which is part of the RAMP tool, is based on research-based studies combinedwith expert group judgments. More than 80 practitioners participated in the development of RAMP I. The tool consistsof dichotomous assessment items grouped into seven categories. Acceptable reliability was found for a majority of theassessment items for 15 practitioners who were given 1 h of training. The usability evaluation points to RAMP I beingusable for screening for musculoskeletal disorder risk factors, i.e., usable for assessing risks, being usable as a decision base,having clear results and that the time needed for an assessment is acceptable. It is concluded that RAMP I is a usable toolfor practitioners.

Place, publisher, year, edition, pages
Taylor & Francis, 2019
Keywords
RAMP tool; risk assessment; risk management; manual materials handling; checklist; observation; reliability; usability
National Category
Production Engineering, Human Work Science and Ergonomics
Identifiers
urn:nbn:se:kth:diva-248972 (URN)10.1080/10803548.2017.1364458 (DOI)000458374800001 ()28795864 (PubMedID)2-s2.0-85031500010 (Scopus ID)
Funder
AFA Insurance, 090168Forte, Swedish Research Council for Health, Working Life and Welfare, 2010-1563
Note

QC 20190514

Available from: 2019-04-10 Created: 2019-04-10 Last updated: 2020-03-09Bibliographically approved
Domkin, D., Forsman, M. & Richter, H. O. (2019). Effect of ciliary-muscle contraction force on trapezius muscle activity during computer mouse work. European Journal of Applied Physiology, 119(2), 389-397
Open this publication in new window or tab >>Effect of ciliary-muscle contraction force on trapezius muscle activity during computer mouse work
2019 (English)In: European Journal of Applied Physiology, ISSN 1439-6319, E-ISSN 1439-6327, Vol. 119, no 2, p. 389-397Article in journal (Refereed) Published
Abstract [en]

The present study aimed to identify whether or not an increase in ciliary-muscle contraction force, when the eye-lens is adjusted for viewing at a near distance, results in an increase in trapezius muscle activity, while performing a natural work task. Twelve participants, ranging in age from 21 to 32years, performed a computer-mouse work task during free gaze conditions. A moving visual target was tracked with a computer mouse on a screen placed at two different distances from the eyes, 25cm and 50cm. Tracking performance, eye accommodation, and bilateral trapezius muscle activity were measured continuously. Ciliary-muscle contraction force was computed according to a formula which takes into account the age-dependent, non-linear relationship between the contraction force of the ciliary muscle and the produced level of eye accommodation. Generalized estimating equations analyses were performed. On the dominant hand side and for the nearest screen distance, there was a significant effect of ciliary-muscle contraction force on the trapezius muscle activity (p<0.001). No other effects were significant (p>0.05). The results support the hypothesis that high visual demands, during computer mouse work, increase ciliary muscle contraction force and contribute to a raise of the sustained level of trapezius muscle activity. The current study specifically clarifies the validity of the relationship between ciliary-muscle contraction force and trapezius muscle activity and demonstrates that this relationship is not due to a general personality trait. We conclude that a high level of ciliary muscle contraction force can contribute to a development of musculoskeletal complaints in the neck-shoulder area.

Place, publisher, year, edition, pages
SPRINGER, 2019
Keywords
Eye-accommodation, Ciliary-muscle contraction force, Computer mouse work, Electromyography, Trapezius muscle, Visual ergonomics
National Category
Physiology
Identifiers
urn:nbn:se:kth:diva-244537 (URN)10.1007/s00421-018-4031-8 (DOI)000457735500006 ()30430279 (PubMedID)2-s2.0-85056460114 (Scopus ID)
Note

QC 20190404

Available from: 2019-04-04 Created: 2019-04-04 Last updated: 2019-04-04Bibliographically approved
Yang, L., Lu, K., Forsman, M., Lindecrantz, K., Seoane, F., Ekblom, Ö. & Eklund, J. (2019). Evaluation of physiological workload assessment methods using heart rate and accelerometry for a smart wearable system. Ergonomics, 62(5), 694-705
Open this publication in new window or tab >>Evaluation of physiological workload assessment methods using heart rate and accelerometry for a smart wearable system
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2019 (English)In: Ergonomics, ISSN 0014-0139, E-ISSN 1366-5847, Vol. 62, no 5, p. 694-705Article in journal (Refereed) Published
Abstract [en]

Work metabolism (WM) can be accurately estimated by oxygen consumption (VO2), which is commonly assessed by heart rate (HR) in field studies. However, the VO2–HR relationship is influenced by individual capacity and activity characteristics. The purpose of this study was to evaluate three models for estimating WM compared with indirect calorimetry, during simulated work activities. The techniques were: the HR-Flex model; HR branched model, combining HR with hip-worn accelerometers (ACC); and HR + arm-leg ACC model, combining HR with wrist- and thigh-worn ACC. Twelve participants performed five simulated work activities and three submaximal tests. The HR + arm-leg ACC model had the overall best performance with limits of agreement (LoA) of −3.94 and 2.00 mL/min/kg, while the HR-Flex model had −5.01 and 5.36 mL/min/kg and the branched model, −6.71 and 1.52 mL/min/kg. In conclusion, the HR + arm-leg ACC model should, when feasible, be preferred in wearable systems for WM estimation.

Keywords
Heart rate, work metabolism, motion sensing, wearable sensors, risk assessment, estimation models
National Category
Medical Engineering
Identifiers
urn:nbn:se:kth:diva-239148 (URN)10.1080/00140139.2019.1566579 (DOI)000468779800007 ()30806164 (PubMedID)2-s2.0-85062366366 (Scopus ID)
Funder
AFA Insurance, 150039
Note

QC 20190218

Available from: 2018-11-16 Created: 2018-11-16 Last updated: 2019-11-12Bibliographically approved
Grooten, W. J., Hansson, A., Forsman, M., Kjellberg, K., Toomingas, A., Mueller, M., . . . Ang, B. O. (2019). Non-participation in initial and repeated health risk appraisals - a drop-out analysis based on a health project. BMC Health Services Research, 19, Article ID 130.
Open this publication in new window or tab >>Non-participation in initial and repeated health risk appraisals - a drop-out analysis based on a health project
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2019 (English)In: BMC Health Services Research, ISSN 1472-6963, E-ISSN 1472-6963, Vol. 19, article id 130Article in journal (Refereed) Published
Abstract [en]

BackgroundHealth risk assessment (HRAs) are commonly used by occupational health services (OHS) to aid workplaces in keeping their employees healthy, but for unknown reasons, many employees choose not to participate in the HRAs. The aim of the study was to explore whether demographic, lifestyle and health-related factors in employees are associated with non-participation in initial and repeated HRAs.MethodsIn an OHS-based health project, 2022 municipal employees were asked to participate in three repeated HRAs. Multiple logistic regression analyses were used so as to determine associations between non-participating and demographic, lifestyle and health-related factors (e.g. biomarkers).ResultsAmong the employees who were asked to participate in the health project, more than half did not participate in any HRA and among those who did, more than one third did not participate in repeated HRAs. Young age, male sex and being employed in the Technical department or Health and Social Care department in comparison with being employed in the department for Childcare and Education were factors significantly associated with non-participation in the initial HRA. These factors, together with being on sick leave and having unhealthy dietary habits, were factors associated with non-participation in repeated HRAs.ConclusionsAmong the non-participators in initial HRAs and in repeated HRAs younger men and those already related to ill-health were overrepresented. This implicates that health care providers to a higher extent should focus on those most needed and that employers should be more engaged in results of repeated HRA's. Future studies should focus on modifiable variables that could make the HRAs more attractive and inclusive.

Place, publisher, year, edition, pages
BMC, 2019
Keywords
Health promotion, Lifestyle changes, Occupational health services, Physical activity, Participation, Sickness prevention
National Category
Medical and Health Sciences
Identifiers
urn:nbn:se:kth:diva-245910 (URN)10.1186/s12913-019-3949-9 (DOI)000459435700002 ()30791905 (PubMedID)2-s2.0-85061980634 (Scopus ID)
Note

QC 20190318

Available from: 2019-03-18 Created: 2019-03-18 Last updated: 2019-04-04Bibliographically approved
Wells, A. C., Kjellman, M., Harper, S. J. F., Forsman, M. & Hallbeck, M. S. (2019). Operating hurts: a study of EAES surgeons. Paper presented at 26th International Congress of the European-Association-of-Endoscopic-Surgery (EAES), MAY 30-JUN 01, 2018, London, ENGLAND. Surgical Endoscopy, 33(3), 933-940
Open this publication in new window or tab >>Operating hurts: a study of EAES surgeons
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2019 (English)In: Surgical Endoscopy, ISSN 0930-2794, E-ISSN 1432-2218, Vol. 33, no 3, p. 933-940Article in journal (Refereed) Published
Abstract [en]

BackgroundWork-related pain and discomfort experienced by surgeons is widely reported in the literature. A survey was, therefore, conducted to explore this issue among members of the European Association for Endoscopic Surgery (EAES).MethodsThe survey was emailed to 2980 EAES members in 2017 enquiring about their working practice, musculoskeletal (MSK) pain and burnout.ResultsA total of 569 (19%) surgeons responded, of whom 556 were practicing surgeons; 86% were consultants, 84% were male, and 94% were right-handed. Respondents operated on average 3.3days/week with 27% of their procedures lasting longer than 3h. The 386 endoscopists surveyed reported performing an average of 5.3 procedures/day with 83% performing endoscopy at least once per week. Over half of practicing surgeons (62%) reported their worst pain score was 3 or higher (10-point scale) in the past 7 working days, encompassing 71% of their open, 72% laparoscopic, 48% robot-assisted cases and 52% of their endoscopies. Of the 120 surgeons who had ever sought medical help for aches, pain or discomfort, 38% were currently in pain and 16% had considered leaving surgery due to their MSK pain, 26% had reported work-related pain to their employer, 26% had been on short-term disability during their career and 4% long-term disability due to MSK disorders. A significant proportion of the respondents (49%) felt their physical discomfort would influence the ability to perform or assist with surgical procedures in the future. These surgeons reported significantly lower satisfaction from their work (p=0.024), higher burnout (p=0.005) and significantly higher callousness toward people (p<0.001) than those not fearing loss of career longevity.ConclusionThe results show that MSK pain is prevalent amongst EAES members. Nearly half the respondents had career longevity fears from pain/discomfort which, in turn, correlated with more prevalent feelings of burnout. More emphasis should be placed on the aetiology, prevention and management of musculoskeletal pain in the surgical workforce.

Place, publisher, year, edition, pages
SPRINGER, 2019
Keywords
Survey, Musculoskeletal pain, Burnout, Operating theatre, Surgical ergonomics, Endoscopy
National Category
Health Sciences
Identifiers
urn:nbn:se:kth:diva-247827 (URN)10.1007/s00464-018-6574-5 (DOI)000459683700034 ()30456510 (PubMedID)2-s2.0-85056885161 (Scopus ID)
Conference
26th International Congress of the European-Association-of-Endoscopic-Surgery (EAES), MAY 30-JUN 01, 2018, London, ENGLAND
Note

QC 20190326

Available from: 2019-03-26 Created: 2019-03-26 Last updated: 2019-03-26Bibliographically approved
Vega-Barbas, M., Diaz-Olivares, J. A., Lu, K., Forsman, M., Seoane, F. & Abtahi, F. (2019). P-Ergonomics Platform: Toward Precise, Pervasive, and Personalized Ergonomics using Wearable Sensors and Edge Computing. Sensors, 19(5), Article ID 1225.
Open this publication in new window or tab >>P-Ergonomics Platform: Toward Precise, Pervasive, and Personalized Ergonomics using Wearable Sensors and Edge Computing
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2019 (English)In: Sensors, ISSN 1424-8220, E-ISSN 1424-8220, Vol. 19, no 5, article id 1225Article in journal (Refereed) Published
Abstract [en]

Preventive healthcare has attracted much attention recently. Improving people's lifestyles and promoting a healthy diet and wellbeing are important, but the importance of work-related diseases should not be undermined. Musculoskeletal disorders (MSDs) are among the most common work-related health problems. Ergonomists already assess MSD risk factors and suggest changes in workplaces. However, existing methods are mainly based on visual observations, which have a relatively low reliability and cover only part of the workday. These suggestions concern the overall workplace and the organization of work, but rarely includes individuals' work techniques. In this work, we propose a precise and pervasive ergonomic platform for continuous risk assessment. The system collects data from wearable sensors, which are synchronized and processed by a mobile computing layer, from which exposure statistics and risk assessments may be drawn, and finally, are stored at the server layer for further analyses at both individual and group levels. The platform also enables continuous feedback to the worker to support behavioral changes. The deployed cloud platform in Amazon Web Services instances showed sufficient system flexibility to affordably fulfill requirements of small to medium enterprises, while it is expandable for larger corporations. The system usability scale of 76.6 indicates an acceptable grade of usability.

Place, publisher, year, edition, pages
MDPI, 2019
Keywords
disease prevention, occupational healthcare, P-Ergonomics, precision ergonomics, musculoskeletal disorders, smart textiles, wearable sensors, wellbeing at work
National Category
Occupational Health and Environmental Health
Identifiers
urn:nbn:se:kth:diva-249891 (URN)10.3390/s19051225 (DOI)000462540400244 ()30862019 (PubMedID)2-s2.0-85062856566 (Scopus ID)
Available from: 2019-04-26 Created: 2019-04-26 Last updated: 2019-04-26Bibliographically approved
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Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-5777-4232

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