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Barbieri, D., Srinivasan, D., Mathiassen, S. E. & Oliveira, A. B. (2019). Variation in upper extremity, neck and trunk postures when performing computer work at a sit-stand station. Applied Ergonomics, 75, 120-128
Open this publication in new window or tab >>Variation in upper extremity, neck and trunk postures when performing computer work at a sit-stand station
2019 (English)In: Applied Ergonomics, ISSN 0003-6870, E-ISSN 1872-9126, Vol. 75, p. 120-128Article in journal (Refereed) Published
Abstract [en]

The aim of this study was to determine the extent of upper arm, neck and trunk posture variation that can be obtained by combining seated and standing computer work, compared to performing only seated computer work. Posture data were recorded for two hours during each of three days of ordinary work from 24 office workers that had been using a sit-stand station for two months. Periods with sitting and standing computer work were identified using on-site observations, and posture means and minute-to-minute variance were determined for both. Expected minute-to-minute posture variability in different temporal combinations of sitting and standing computer work were determined by simulation, and expressed in terms of a Job Variance Ratio, i.e. the relative increase in variability compared to sitting-only work. For all three postures, mean values differed between sitting and standing computer work, and both showed a notable minute-to-minute variability. For most workers, posture variability was larger when combining sitting and standing than when sitting only, and simulations suggested to introduce more standing than what the worker currently practiced. The results indicate that introducing a sit-stand table could, for most office workers, have a positive effect on upper arm, neck and trunk posture variability.

Keywords
office work; adjustable table; job variance ratio (JVR); sedentary behaviors, trunk flexion, upper arm elevation
National Category
Occupational Health and Environmental Health
Identifiers
urn:nbn:se:hig:diva-23157 (URN)10.1016/j.apergo.2018.09.012 (DOI)2-s2.0-8505417244 (Scopus ID)
Funder
Forte, Swedish Research Council for Health, Working Life and Welfare, 2009-1761
Note

Funders:

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Grant n:o 472946/2013-7

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Grant n:o 2015/19504-4

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Grant n:o 2012/24502-2

National Council for Scientific Research

Available from: 2016-12-24 Created: 2016-12-24 Last updated: 2018-10-15Bibliographically approved
Huysmans, M. A., Srinivasan, D. & Mathiassen, S. E. (2018). Consistency of sedentary behavior patterns among office workers with long-term access to sit-stand workstations. Human Factors
Open this publication in new window or tab >>Consistency of sedentary behavior patterns among office workers with long-term access to sit-stand workstations
2018 (English)In: Human Factors, ISSN 0018-7208, E-ISSN 1547-8181Article in journal (Refereed) Submitted
Keywords
Temporal patterns, sitting time, day-to-day variability, individual differences, computer work, variance component analysis
National Category
Occupational Health and Environmental Health
Identifiers
urn:nbn:se:hig:diva-27606 (URN)
Funder
Forte, Swedish Research Council for Health, Working Life and Welfare, 2009-1761
Available from: 2018-07-29 Created: 2018-07-29 Last updated: 2018-09-03Bibliographically approved
Kelson, D., Srinivasan, D. & Mathiassen, S. E. (2018). Differences in trapezius muscle activation patterns in office workers with and without chronic neck-shoulder pain, as quantified through exposure variation analysis. In: : . Paper presented at Human Factors and Ergonomics Society 2018 Annual Meeting, 1-5 October 2018, Philadelphia, USA.
Open this publication in new window or tab >>Differences in trapezius muscle activation patterns in office workers with and without chronic neck-shoulder pain, as quantified through exposure variation analysis
2018 (English)Conference paper, Oral presentation with published abstract (Refereed)
National Category
Occupational Health and Environmental Health
Identifiers
urn:nbn:se:hig:diva-28296 (URN)
Conference
Human Factors and Ergonomics Society 2018 Annual Meeting, 1-5 October 2018, Philadelphia, USA
Available from: 2018-10-12 Created: 2018-10-12 Last updated: 2018-10-15Bibliographically approved
Jackson, J., Srinivasan, D. & Mathiassen, S. E. (2018). Is movement variability a consistent personal trait? Kinematic evidence from long-cycle assembly work. In: : . Paper presented at 20th Congress International Ergonomics Association, 26-30 augusti, 2018, Florens, Italy.
Open this publication in new window or tab >>Is movement variability a consistent personal trait? Kinematic evidence from long-cycle assembly work
2018 (English)Conference paper, Poster (with or without abstract) (Refereed)
National Category
Occupational Health and Environmental Health
Identifiers
urn:nbn:se:hig:diva-27826 (URN)
Conference
20th Congress International Ergonomics Association, 26-30 augusti, 2018, Florens, Italy
Funder
Forte, Swedish Research Council for Health, Working Life and Welfare, 2009-1761
Available from: 2018-09-04 Created: 2018-09-04 Last updated: 2018-09-07Bibliographically approved
Weber, Z. R., Srinivasan, D. & Côté, J. (2018). Sex-Specific Links in Motor and Sensory Adaptations to Repetitive Motion-Induced Fatigue. Motor Control, 22(2), 149-169
Open this publication in new window or tab >>Sex-Specific Links in Motor and Sensory Adaptations to Repetitive Motion-Induced Fatigue
2018 (English)In: Motor Control, ISSN 1087-1640, E-ISSN 1543-2696, Vol. 22, no 2, p. 149-169Article in journal (Refereed) Published
Abstract [en]

The objectives of this study were to assess the sex-specific relationships between motor and sensory adaptations to repetitive arm motion-induced neck/shoulder fatigue, and measure how additional sensory stimulation affected these adaptations. Twenty-three participants performed two sessions of a repetitive pointing task until scoring 8 on the Borg CR10 scale for neck/shoulder exertion or for a maximum of 45min, with and without sensory stimulation (i.e. light touch) applied on the fatiguing shoulder. Just before reaching the task termination criteria, all participants showed changes in mean and variability of arm joint angles and experienced a five-fold increase in anterior deltoid (AD) sensory threshold in the stimulus-present condition. Women with the greatest increases in AD sensory thresholds demonstrated the greatest increases in shoulder variability (r= .66) whereas men with the greatest increases in upper trapezius sensory thresholds demonstrated greatest changes in shoulder angle (r= -.60) and coordination (r= .65) variability. Thus, sensory stimulation had no influence on time-to-termination but affected how men and women differently adapted, suggesting sex differences in the sensorimotor fatigue response mechanisms.

Keywords
Biomechanics, Gender, Motor control, Muscle fatigue
National Category
Occupational Health and Environmental Health
Identifiers
urn:nbn:se:hig:diva-24200 (URN)10.1123/mc.2017-0004 (DOI)000429381400003 ()28530500 (PubMedID)2-s2.0-85047006473 (Scopus ID)
Funder
Forte, Swedish Research Council for Health, Working Life and Welfare, 2011-0075
Note

Funding agencies:

- Institut de Recherche Robert-Sauve en Sante et en Securite du Travail (IRSST)- Natural Science and Engineering Research Council (NSERC) 

Available from: 2017-06-13 Created: 2017-06-13 Last updated: 2018-06-05Bibliographically approved
Kelson, D., Srinivasan, D. & Mathiassen, S. E. (2018). Trapezius Muscle Activity Variation during computer work performed by individuals with andwithout chronic neck shoulder pain. In: : . Paper presented at 20th Congress International Ergonomics Association, 26-30 augusti, 2018, Florens, Italy.
Open this publication in new window or tab >>Trapezius Muscle Activity Variation during computer work performed by individuals with andwithout chronic neck shoulder pain
2018 (English)Conference paper, Oral presentation with published abstract (Refereed)
National Category
Occupational Health and Environmental Health
Identifiers
urn:nbn:se:hig:diva-27829 (URN)
Conference
20th Congress International Ergonomics Association, 26-30 augusti, 2018, Florens, Italy
Available from: 2018-09-04 Created: 2018-09-04 Last updated: 2018-09-07Bibliographically approved
Srinivasan, D., Mathiassen, S. E. & Huysmans, M. (2017). Between-subjects and between-days variance in occupational sitting time among seasoned users of sit-stand workstations. In: : . Paper presented at American Industrial Hygiene Conference & Exposition 2017, June 4-7​ 2017, Seattle, WA, USA.
Open this publication in new window or tab >>Between-subjects and between-days variance in occupational sitting time among seasoned users of sit-stand workstations
2017 (English)Conference paper, Published paper (Refereed)
National Category
Occupational Health and Environmental Health
Identifiers
urn:nbn:se:hig:diva-24195 (URN)
Conference
American Industrial Hygiene Conference & Exposition 2017, June 4-7​ 2017, Seattle, WA, USA
Available from: 2017-06-13 Created: 2017-06-13 Last updated: 2018-03-13Bibliographically approved
Barbieri, D. F., Srinivasan, D., Mathiassen, S. E. & Oliveira, A. B. (2017). Comparison of sedentary behaviors in office workers using sit-stand tables with and without semi-automated position changes. Human Factors, 59(5), 782-795
Open this publication in new window or tab >>Comparison of sedentary behaviors in office workers using sit-stand tables with and without semi-automated position changes
2017 (English)In: Human Factors, ISSN 0018-7208, E-ISSN 1547-8181, Vol. 59, no 5, p. 782-795Article in journal (Refereed) Published
Abstract [en]

Objective: This study compared usage patterns of two different electronically controlled sit-stand tables during a 2-month intervention period among office workers.

Background: Office workers spend most of their working time sitting, which is likely detrimental to health. Although the introduction of sit-stand tables has been suggested as an effective intervention to decrease sitting time, limited evidence is available on usage patterns of sit-stand tables, and whether patterns   are influenced by table configuration.

Methods: Twelve workers were provided with standard sit-stand tables (non-automated table group) and 12 with semi-automated sit-stand tables programmed to change table position according to a pre-set pattern, if the user agreed to the system-generated prompt (semi-automated table group). Table position was monitored continuously for two months after introducing the tables, as a proxy for sit-stand behavior.

Results: On average, the table was in a “sit” position for 85% of the work-day in both groups; this did not change significantly during the 2-month period. Switches in table position from sit to stand were, however, more frequent in the semi-automated table group than in the non-automated table group (0.65 vs. 0.29 hr-1; p=0.001).

Conclusion: Introducing a semi-automated sit-stand table appeared to be an attractive alternative to a standard sit-stand table, since it led to more posture variation.

Application: A semi-automated sit-stand table may effectively contribute to making postures more variable among office workers, and thus aid in alleviating negative health effects of extensive sitting.

Keywords
Alternative workstation; posture variation; fatigue; productivity
National Category
Occupational Health and Environmental Health
Identifiers
urn:nbn:se:hig:diva-21528 (URN)10.1177/0018720817695771 (DOI)000405498500005 ()28704634 (PubMedID)2-s2.0-85024105349 (Scopus ID)
Funder
Forte, Swedish Research Council for Health, Working Life and Welfare, 2009-1761
Note

Funding agency:

Sao Paulo Research Foundation (FAPESP)  Grant no: 2015/19504-4; 2012/24502-2 

National Council of Technological and Scientific Development (CNPq)  Grant no: 472946/2013-7

Available from: 2016-05-30 Created: 2016-05-30 Last updated: 2018-06-04Bibliographically approved
Sandlund, J., Srinivasan, D., Heiden, M. & Mathiassen, S. E. (2017). Differences in motor variability among individuals performing a standardized short-cycle manual task. Human Movement Science, 51, 17-26
Open this publication in new window or tab >>Differences in motor variability among individuals performing a standardized short-cycle manual task
2017 (English)In: Human Movement Science, ISSN 0167-9457, E-ISSN 1872-7646, Vol. 51, p. 17-26Article in journal (Refereed) Published
Abstract [en]

Motor variability (MV) has been suggested to be a determinant of the risk for developing musculoskeletal disorders in repetitive work. In this study we examined whether individuals consistently differed in the extent of motor variability when performing a standardized short-cycle manual task. On three separate days, arm kinematics was recorded in 14 healthy subjects performing a pipetting task, transferring liquid from a pick-up tube to eight target tubes with a cycle time of 2.8 s. Cycle-to-cycle standard deviations (SD) of a large selection of shoulder and elbow kinematic variables, were processed using principal component analysis (PCA). Thereafter, between-subjects and between-days (within-subject) variance components were calculated using a random effects model for each of four extracted principal components. The results showed that MV differed consistently between subjects (95% confidence intervals of the between-subjects variances did not include zero) and that subjects differed consistently in MV between days. Thus, our results support the notion that MV may be a consistent personal trait, even though further research is needed to verify whether individuals rank consistently in MV even across tasks. If so, MV may be a candidate determinant of the risk of developing fatigue and musculoskeletal disorders in repetitive occupational work.

Keywords
Kinematics, Repetitive task, Principal component analysis, Day-to-day variability, Between-subjects variability, Individual differences
National Category
Occupational Health and Environmental Health
Identifiers
urn:nbn:se:hig:diva-21889 (URN)10.1016/j.humov.2016.10.009 (DOI)000393633800003 ()27821310 (PubMedID)2-s2.0-84994052099 (Scopus ID)
Funder
Forte, Swedish Research Council for Health, Working Life and Welfare, 2009–1761Forte, Swedish Research Council for Health, Working Life and Welfare, 2009-0103Forte, Swedish Research Council for Health, Working Life and Welfare, 2011–0075
Available from: 2016-06-23 Created: 2016-06-23 Last updated: 2018-03-13Bibliographically approved
Rudolfsson, T., Björklund, M., Svedmark, Å., Srinivasan, D. & Djupsjöbacka, M. (2017). Direction-specific impairments in cervical range of motion in women with chronic neck pain: influence of head posture and gravitationally induced torque. PLoS ONE, 12(1), Article ID e0170274.
Open this publication in new window or tab >>Direction-specific impairments in cervical range of motion in women with chronic neck pain: influence of head posture and gravitationally induced torque
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2017 (English)In: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 12, no 1, article id e0170274Article in journal (Refereed) Published
Abstract [en]

Background: Cervical range of motion (ROM) is commonly assessed in clinical practice and research. In a previous study we decomposed active cervical sagittal ROM into contributions from lower and upper levels of the cervical spine and found level- and direction-specific impairments in women with chronic non-specific neck pain. The present study aimed to validate these results and investigate if the specific impairments can be explained by the neutral posture (defining zero flexion/extension) or a movement strategy to avoid large gravitationally induced torques on the cervical spine.

Methods: Kinematics of the head and thorax was assessed in sitting during maximal sagittal cervical flexion/extension (high torque condition) and maximal protraction (low torque condition) in 120 women with chronic non-specific neck pain and 40 controls. We derived the lower and upper cervical angles, and the head centre of mass (HCM), from a 3-segment kinematic model. Neutral head posture was assessed using a standardized procedure.

Findings: Previous findings of level- and direction-specific impairments in neck pain were confirmed. Neutral head posture was equal between groups and did not explain the direction-specific impairments. The relative magnitude of group difference in HCM migration did not differ between high and low torques conditions, lending no support for our hypothesis that impairments in sagittal ROM are due to torque avoidance behaviour.

Interpretation: The direction- and level-specific impairments in cervical sagittal ROM can be generalised to the population of women with non-specific neck pain. Further research is necessary to clarify if torque avoidance behaviour can explain the impairments.

Keywords
Neck Pain, Cervical Range of Motion, Kinematics, Musculoskeletal pain
National Category
Physiotherapy
Identifiers
urn:nbn:se:hig:diva-23215 (URN)10.1371/journal.pone.0170274 (DOI)000392380100068 ()28099504 (PubMedID)2-s2.0-85009874286 (Scopus ID)
Funder
Forte, Swedish Research Council for Health, Working Life and Welfare, 2009-1403AFA Insurance, 090288
Note

Additional funding from Centre for Environmental Research in Umeå, Award Number 1152383 and University of Gävle.

Available from: 2017-01-05 Created: 2017-01-05 Last updated: 2018-03-13Bibliographically approved
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-9327-6177

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