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Whole-body vibration exposure and non-neutral neck postures during occupational use of all-terrain vehicles.
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 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.
2005 (English)In: Annals of Occupational Hygiene, ISSN 0003-4878, E-ISSN 1475-3162, Vol. 49, no 3, 267-275 p.Article in journal (Refereed) Published
Abstract [en]

OBJECTIVES: The purpose of this study was to characterize whole-body vibration (WBV) exposure from various all-terrain vehicles (ATVs) like snowgroomers, snowmobiles and forwarders, and to investigate how frequently the drivers' cervical spine is positioned in a non-neutral rotational position during operation. METHODS: Field measurements of WBV were measured according to the international standard ISO 2631-1 in 19 ATVs. Simultaneous recordings of frequency and duration of rotational neck movements exceeding 15 degrees were achieved through an observational method, PEOflex. RESULTS: The sum of the vectors of frequency-weighted r.m.s. acceleration varied between 0.5 and 3.5 m s(-2), which meant that for most vehicles they exceeded the action value stated by the European Union (0.5 m s(r.m.s.)(-2)). In general, snowmobiles achieved the highest vibration total value. The dominant vibration direction for the snowmobile was the x-axis but the z-axis also had relatively high vibration dose values and maximal transient vibration values. The z-axis was the dominant vibration direction for the snowgroomer and the y-axis for the forwarder. Frequency and duration of non-neutral rotational neck postures were relatively low for all driver categories. CONCLUSIONS: Vibration magnitudes in ATVs are considerably high than the EU's action value and the health guidance caution zones in ISO 2631-1. The dominant vibration direction varies depending on the machine type. Duration and frequency of non-neutral rotational positions do not seem to constitute single ergonomic risk factors for musculoskeletal symptoms in the neck among professional drivers of ATVs. However, synergistic effects with other factors are conceivable.

Place, publisher, year, edition, pages
2005. Vol. 49, no 3, 267-275 p.
Keyword [en]
Analysis of Variance, Humans, Neck/*physiology, Occupational Exposure/*analysis, Off-Road Motor Vehicles, Posture/physiology, Risk Assessment/methods, Rotation, Vibration
National Category
Environmental Health and Occupational Health
Identifiers
URN: urn:nbn:se:umu:diva-6003DOI: 10.1093/annhyg/meh077PubMedID: 15591073OAI: oai:DiVA.org:umu-6003DiVA: diva2:145671
Available from: 2007-12-06 Created: 2007-12-06 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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Publisher's full textPubMedhttp://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Retrieve&list_uids=15591073&dopt=Citation

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Rehn, BörjeNilsson, TohrLundström, Ronnie

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