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Wahlström, Jens, PhD/DocentORCID iD iconorcid.org/0000-0003-0696-7506
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Publications (3 of 3) Show all publications
Wahlström, J., Bergsten, E., Trask, C., Mathiassen, S. E., Jackson, J. & Forsman, M. (2016). Full-shift trunk and upper arm postures and movements among aircraft baggage handlers. Annals of Occupational Hygiene, 60(8), 977-990
Open this publication in new window or tab >>Full-shift trunk and upper arm postures and movements among aircraft baggage handlers
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2016 (English)In: Annals of Occupational Hygiene, ISSN 0003-4878, E-ISSN 1475-3162, Vol. 60, no 8, p. 977-990Article in journal (Refereed) Published
Abstract [en]

Objectives: The present study assessed full shift trunk and upper arm postural exposure amplitudes, frequencies, and durations among Swedish airport baggage handlers, and aimed to determine whether exposures differ between workers at the ramp (loading and unloading aircraft) and baggage sorting areas.

Methods: Trunk and upper arm postures were measured using inclinometers during three full work shifts on each of 27, male baggage handlers working at a large Swedish airport. Sixteen of the baggage handlers worked on the ramp and 11 in the sorting area. Variables summarizing postures and movements were calculated, and mean values and variance components between subjects and within subject (between days) were estimated using restricted maximum likelihood algorithms in a one-way random effect model.

Results: In total, data from 79 full shifts (651 hours) were collected with a mean recording time of 495 minutes per shift (range 319-632). On average, baggage handlers worked with the right and left arm elevated >60° for 6.4% and 6.3% of the total workday, respectively. The 90th percentile trunk forward projection (FP) was 34.1° and the 50th percentile trunk movement velocity was 8°s-1. For most trunk (FP) and upper arm exposure variables, between-subject variability was considerable, suggesting that the flight baggage handlers were not a homogeneously exposed group. A notable between-days variability pointed to the contents of the job differing on different days. Peak exposures (>90°) were higher for ramp workers than for sorting area workers (trunk 0.6% ramp vs 0.3% sorting; right arm 1.3% ramp vs 0.7% sorting).

Conclusions: Trunk and upper arm postures and movements among flight baggage handlers measured by inclinometry were similar to those found in other jobs comprising manual material handling, known to be associated with increased risks for musculoskeletal disorders. The results showed that full-shift trunk (FP), and to some extent peak arm exposures, were higher for ramp workers compared to sorting workers.

Keywords
baggage handling, exposure variability; ergonomics, musculoskeletal disorders, epidemiology
National Category
Occupational Health and Environmental Health
Research subject
Health-Promoting Work
Identifiers
urn:nbn:se:hig:diva-20430 (URN)10.1093/annhyg/mew043 (DOI)000386017300007 ()27417186 (PubMedID)2-s2.0-84990985854 (Scopus ID)
Funder
AFA Insurance, 100071Forte, Swedish Research Council for Health, Working Life and Welfare, 2009-1761
Available from: 2015-10-16 Created: 2015-10-16 Last updated: 2020-01-31Bibliographically approved
Jackson, J., Mathiassen, S. E., Wahlström, J., Liv, P. & Forsman, M. (2015). Digging deeper into the assessment of upper arm elevation angles using standard inclinometry [Letter to the editor]. Applied Ergonomics, 51, 102-103
Open this publication in new window or tab >>Digging deeper into the assessment of upper arm elevation angles using standard inclinometry
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2015 (English)In: Applied Ergonomics, ISSN 0003-6870, E-ISSN 1872-9126, Vol. 51, p. 102-103Article in journal, Letter (Other academic) Published
Keywords
Validity, Bias, Posture assessment
National Category
Occupational Health and Environmental Health
Identifiers
urn:nbn:se:hig:diva-19344 (URN)10.1016/j.apergo.2015.04.012 (DOI)000358389100012 ()26154209 (PubMedID)2-s2.0-84937416785 (Scopus ID)
Available from: 2015-05-20 Created: 2015-05-20 Last updated: 2020-01-31Bibliographically approved
Jackson, J., Mathiassen, S. E., Wahlström, J., Liv, P. & Forsman, M. (2015). Is what you see what you get? Standard inclinometry of set upper arm elevation angles. Applied Ergonomics, 47, 242-252
Open this publication in new window or tab >>Is what you see what you get? Standard inclinometry of set upper arm elevation angles
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2015 (English)In: Applied Ergonomics, ISSN 0003-6870, E-ISSN 1872-9126, Vol. 47, p. 242-252Article in journal (Refereed) Published
Abstract [en]

Previous research suggests inclinometers (INC) underestimate upper arm elevation. This study was designed to quantify possible bias in occupationally relevant postures, and test whether INC performance could be improved using calibration.

Participants were meticulously positioned in set arm flexion and abduction angles between 0° and 150°. Different subject-specific and group-level regression models comprising linear and quadratic components describing the relationship between set and INC-registered elevation were developed using subsets of data, and validated using additional data.

INC measured arm elevation showed a downward bias, particularly above 60°.  INC data adjusted using the regression models were superior to un-adjusted data; a subject-specific, two-point calibration based on measurements at 0° and 90° gave results closest to the ‘true’ set angles.

Thus, inclinometer measured arm elevation data required calibration to arrive at ‘true’ elevation angles. Calibration to a common measurement scale should be considered when comparing arm elevation data collected using different methods.

Keywords
measurement error, observation, working postures
National Category
Occupational Health and Environmental Health
Identifiers
urn:nbn:se:hig:diva-16159 (URN)10.1016/j.apergo.2014.08.014 (DOI)000347663600028 ()25479994 (PubMedID)2-s2.0-84919663729 (Scopus ID)
Available from: 2014-01-24 Created: 2014-01-24 Last updated: 2020-01-31Bibliographically approved
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Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-0696-7506

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