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Variation in exposure to whole-body vibration for operators of forwarder vehicles - aspects on measurement strategies and prevention
Umeå University, Faculty of Medicine, Department of Public Health and Clinical Medicine, Occupational Medicine.
Umeå University, Faculty of Medicine, Department of Public Health and Clinical Medicine, Occupational and Environmental Medicine.
Umeå University, Faculty of Science and Technology, Mathematical statistics.
Umeå University, Faculty of Medicine, Department of Public Health and Clinical Medicine, Occupational and Environmental Medicine.
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2005 (English)In: International Journal of Industrial Ergonomics, ISSN 0169-8141, E-ISSN 1872-8219, Vol. 35, no 9, 831-842 p.Article in journal (Refereed) Published
Abstract [en]

Exposure to whole-body vibration (WBV) may cause health problems, e.g. lumbago. The risk will depend on intensity and duration. Exposure to WBV in vehicles varies due to several factors as the vehicle type, the terrain condition, the driver, the speed etc. To estimate the health risk, the measurement strategy has to consider this variation. Furthermore, to understand the importance of different preventive strategies, the cause of the variation has to be known. The objective of this study was to describe variation in exposure to seated WBV during occupational operation of forwarder vehicles and to investigate sources for variation. WBV was measured in 10 various terrain types for seven forwarders operated by 11 drivers. For each driver there were between four and 35 measurements. The measurement periods varied between 0.2 and 34 min. The vibration total value (av) and total vibration dose value (VDVt) were determined. Results showed that WBV exposure varied considerably and that this variation could result in different conclusions regarding health risk assessments. The highest magnitudes were achieved during travelling activities. During travelling empty, variations in av were significantly dependent upon forwarder model and terrain type. No significant predictor for variation in VDVt was however found for travelling empty. During travelling loaded the forwarder model and operator were the most important predictors for variation in av. Variation in VDVt was also dependent on the forwarder model during travelling loaded.

Place, publisher, year, edition, pages
2005. Vol. 35, no 9, 831-842 p.
Keyword [en]
Whole-body vibration, Ergonomics, Risk assessment, Prevention, Musculoskeletal, Operator, Terrain
National Category
Environmental Health and Occupational Health
Identifiers
URN: urn:nbn:se:umu:diva-3812DOI: 10.1016/j.ergon.2005.03.001OAI: oai:DiVA.org:umu-3812DiVA: diva2:142689
Available from: 2004-03-24 Created: 2004-03-24 Last updated: 2011-09-15Bibliographically approved
In thesis
1. Musculoskeletal disorders and whole-body vibration exposure among professional drivers of all-terrain vehicles
Open this publication in new window or tab >>Musculoskeletal disorders and whole-body vibration exposure among professional drivers of all-terrain vehicles
2004 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Musculoskeletal disorders are common among professional driver groups. Ergonomic risk factors at work are often suggested as causative, aggravating or preserving. The general aim with this thesis is to investigate the association between musculoskeletal disorders and physical exposure with special with special focus on whole-body vibration (WBV), among professional drivers of all-terrain vehicles (ATVs). Drivers of ATVs are expsosed to high magnitudes of WBV and shock. This thesis included drivers of forest machines, snowgroomers and snowmobiles. A cross-sectional study revealed that ATV drivers had an increased risk of musculoskeletal symptoms in the neck-shoulder and thoracic regions, even after adjusting for age, smoking habits and psychosocial stress. Prevalence rates were in the range of 1.5-2.9 (CI:1.2-5.2) compared to an age-matched group from the general population. No group of ATV drivers had a significantly increased risk of low back pain. Trend analysis showed no association between symptoms and exposure time. A clinical investigation of a subgroup found that it was for ATV drivers with neck pain to have assymetrical and focal neuropathies, pure or in mix with a nociceptive disorder, in the neck and upper extremities (47-79%), which was in contrast to referents with neck pain who had more nociceptive disorders (27% prevalence of neuropathy). Two studies measured characteristics of seated WBV exposure in forest machines (forwarders), snowgroomers and snowmobiles. The magnitudes of WBV in ATVs, measured and analyzed according to ISO 2631-1, were between 0.5-3.5 m/s2 (frequency weighted vector sum), which was considered high compared to limits suggested by the international standard ISO 2631-1 and the physical agent directive from the Euoropean Union (0.5 m/s2, rms). Drivers of ATVs were exposed to horizontally directed WBV and shocks. Non-neutral neck postures are ergonomic risk factors that occured infrequently and with short duration. The magnitude of seated WBV in forwarder vehicles varied substantiálly depending on model, terrain condition and driver. This may result in different conclusions regarding health risk assessments. The main conclusion from this thesis is that musculoskeletal symptoms and disorders in the neck and upper extremities, among drivers of ATVs, may be a result of long-time exposure to shock-type and horisozontally oriented seated WBV.

Publisher
85 p.
Series
Umeå University medical dissertations, ISSN 0346-6612 ; 852
Keyword
Medicine, Whole-body vibration, Shock, Ergonomics, Epidemiology, Musculoskeletal, Driver, Medicin
National Category
Dermatology and Venereal Diseases
Research subject
Medicine
Identifiers
urn:nbn:se:umu:diva-216 (URN)91-7305-517-4 (ISBN)
Public defence
2004-04-16, Stora Föresläsningssalen, Arbetslivsinstitutet, Campus, Umeå, 13:00
Opponent
Supervisors
Available from: 2004-03-24 Created: 2004-03-24 Last updated: 2010-08-11Bibliographically approved

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