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Huysmans, M. A., Srinivasan, D. & Mathiassen, S. E. (2019). Consistency of sedentary behavior patterns among office workers with long-term access to sit-stand workstations. Annals of Work Exposures and Health, 63(5), 583-591
Open this publication in new window or tab >>Consistency of sedentary behavior patterns among office workers with long-term access to sit-stand workstations
2019 (English)In: Annals of Work Exposures and Health, ISSN 2398-7308, Vol. 63, no 5, p. 583-591Article in journal (Refereed) Published
Abstract [en]

INTRODUCTION: Sit-stand workstations are a popular intervention to reduce sedentary behavior (SB) in office settings. However, the extent and distribution of SB in office workers long-term accustomed to using sit-stand workstations as a natural part of their work environment are largely unknown. In the present study, we aimed to describe patterns of SB in office workers with long-term access to sit-stand workstations and to determine the extent to which these patterns vary between days and workers. METHODS: SB was objectively monitored using thigh-worn accelerometers for a full week in 24 office workers who had been equipped with a sit-stand workstation for at least 10 months. A comprehensive set of variables describing SB was calculated for each workday and worker, and distributions of these variables between days and workers were examined. RESULTS: On average, workers spent 68% work time sitting [standard deviation (SD) between workers and between days (within worker): 10.4 and 18.2%]; workers changed from sitting to standing/walking 3.2 times per hour (SDs 0.6 and 1.2 h-1); with bouts of sitting being 14.9 min long (SDs 4.2 and 8.5 min). About one-third of the workers spent >75% of their workday sitting. Between-workers variability was significantly different from zero only for percent work time sitting, while between-days (within-worker) variability was substantial for all SB variables. CONCLUSIONS: Office workers accustomed to using sit-stand workstations showed homogeneous patterns of SB when averaged across several days, except for percent work time seated. However, SB differed substantially between days for any individual worker. The finding that many workers were extensively sedentary suggests that just access to sit-stand workstations may not be a sufficient remedy against SB; additional personalized interventions reinforcing use may be needed. To this end, differences in SB between days should be acknowledged as a potentially valuable source of variation.

Place, publisher, year, edition, pages
Oxford University Press, 2019
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)10.1093/annweh/wxz022 (DOI)000493122200009 ()31008506 (PubMedID)2-s2.0-85066456948 (Scopus ID)
Funder
Forte, Swedish Research Council for Health, Working Life and Welfare, 2009-1761
Note

Also funding from the employers of the authors; the University of Gävle, Amsterdam UMC, and Virginia Tech USA

Available from: 2018-07-29 Created: 2018-07-29 Last updated: 2019-11-22Bibliographically approved
Kelson, D. M., Mathiassen, S. E. & Srinivasan, D. (2019). Trapezius muscle activity variation during computer work performed by individuals with and without shoulder-neck pain. Applied Ergonomics, 81, Article ID 102908.
Open this publication in new window or tab >>Trapezius muscle activity variation during computer work performed by individuals with and without shoulder-neck pain
2019 (English)In: Applied Ergonomics, ISSN 0003-6870, E-ISSN 1872-9126, Vol. 81, article id 102908Article in journal (Refereed) Published
Abstract [en]

This study aimed at determining the extent to which individuals with neck-shoulder pain and non-symptomatic individuals differ in muscle activation patterns, when performing computer work, as quantified by exposure variation analysis (EVA). As a secondary aim, we also aimed to quantify the day-to-day reliability of EVA variables describing trapezius muscle activation in a non-symptomatic control group. Thirteen touch-typing computer users (pain: n=5, non-symptomatic: n=8) completed three pre-selected computer tasks in the laboratory.

Upper trapezius muscle activity was recorded using electromyography and analyzed using EVA with five amplitude and five duration categories. Individuals with neck-shoulder pain spent less time at low amplitudes and exhibited longer uninterrupted periods of muscle activation compared to their non-symptomatic counterparts. Thus, non-symptomatic workers tended to switch between exposure levels more often than individuals with pain. For a majority of EVA variables, ICCs ranged from 0.6 to 0.9, and between-days coefficients of variation were between 0.4 and 2.2.

Keywords
Exposure variation analysis, motor variability, reliability
National Category
Occupational Health and Environmental Health
Identifiers
urn:nbn:se:hig:diva-28821 (URN)10.1016/j.apergo.2019.102908 (DOI)000486359400041 ()31422258 (PubMedID)2-s2.0-85069671222 (Scopus ID)
Available from: 2018-12-14 Created: 2018-12-14 Last updated: 2019-11-25Bibliographically approved
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)000454371900010 ()30509516 (PubMedID)2-s2.0-85054172448 (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: 2019-11-26Bibliographically 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: Proceedings of the Human Factors and Ergonomics Society Annual Meeting: . Paper presented at Human Factors and Ergonomics Society 2018 Annual Meeting, 1-5 October 2018, Philadelphia, USA (pp. 962-966). Sage Publications, 2
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)In: Proceedings of the Human Factors and Ergonomics Society Annual Meeting, Sage Publications, 2018, Vol. 2, p. 962-966Conference paper, Published paper (Refereed)
Abstract [en]

The purpose of this study was to quantify upper-trapezius muscle activation patterns using exposure variation analysis (EVA) in healthy computer workers and those with chronic neck-shoulder pain. Eight healthy and five chronic pain participants were asked to complete three computer-based tasks (TYPE, CLICK, and FORM) in two pacing conditions (self-paced and control-paced). EVA was used to quantify variation using five amplitude classes and five duration classes. Performance in each task was also quantified. Healthy workers and those with chronic pain did not differ in performance, and they both exhibited similarly low levels of muscle activation amplitude. Pain participants, however, were found to spend less time in lower duration classes across tasks and conditions. These results indicate that individuals with chronic neck-shoulder pain utilize movement strategies involving sustained durations of continuous muscle activation. This may be suggestive of decreased temporal variation in muscle activation patterns in those with chronic pain.

Place, publisher, year, edition, pages
Sage Publications, 2018
National Category
Occupational Health and Environmental Health
Identifiers
urn:nbn:se:hig:diva-28296 (URN)10.1177/1541931218621222 (DOI)2-s2.0-85072756414 (Scopus ID)
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: 2019-10-15Bibliographically 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
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
Show others...
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
Projects
FIIP: Motor Variability in Occupational Work: Determinants & Physiological effects [2011-00075_Forte]; University of Gävle
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-9327-6177

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