Sources of Variance in Exposure to Nonneutral Trunk Postures in Varying Work Situations

Objectives The purpose of this study was to estimate the different components of variance in exposure to nonneutral trunk postures. Methods The percentages of worktime spent in trunk flexion and trunk rotation or lateroflexion during 10-min observation periods were used as primary measures in analys...

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Bibliographic Details
Published in:	Scandinavian Journal of Work, Environment ＆ Health Vol. 21; no. 3; pp. 215 - 222
Main Authors:	van der Beek, Allard J, Kuiper, Judith I, Dawson, Mirande, Burdorf, Alex, Bongers, Paulien M, Frings-Dresen, Monique HW
Format:	Journal Article
Language:	English
Published:	Helsinki Scandinavian Journal of Work, Environment ＆ Health 01-06-1995 National Institute of Occupational Health (Sweden) Institute of Occupational Health (Finland) National Institute of Occupational Health (Denmark) National Institute of Occupational Health (Norway) Scandinavian journal of work, environment & health
Subjects:	Adult Analysis of Variance Biological and medical sciences Chemical hazards Ergonomics. Workplace layout Ergonomics. Workplace layout. Occupational psychology Forklifts Humans Medical sciences Middle Aged Nurses Occupational Exposure - analysis Occupational medicine Posture Prospective Studies Public health. Hygiene-occupational medicine Sanitation workers Statistical variance Time Factors Transport workers Truck drivers Warehouses Work Workdays occupational epidemiology lumbar posture back pain observation measurement strategy exposure assessment variability misclassification Human Intraindividual comparison Occupational physiology Spine Interindividual comparison Professional activity Occupational exposure Variance analysis Epidemiology Occupational medicine Posture
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Summary:	Objectives The purpose of this study was to estimate the different components of variance in exposure to nonneutral trunk postures. Methods The percentages of worktime spent in trunk flexion and trunk rotation or lateroflexion during 10-min observation periods were used as primary measures in analyses of variance to separate the total variance in its components. For two occupational groups six observation periods were selected per worker, and for four other groups 10 periods were used. Most of the 35 subjects were not restricted to one workplace, and they performed dynamic work while being observed. Results The variance within workers contributed around 80% to the total variability of exposure to both unfavorable postures. These results indicate that it is difficult to achieve an unbiased estimate of exposure to postural stress for individual workers who perform dynamic tasks in varying work situations. Conclusions The results indicate that it is difficult to achieve an unbiased estimate of exposure to postural stress for individual workers who perform dynamic tasks in varying work situations. Measurement strategy for exposure assessment requires many repeated observations per worker.
Bibliography:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23
ISSN:	0355-3140 1795-990X
DOI:	10.5271/sjweh.30