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    Partly visible periods in posture observation from video: Prevalence and effect on summary estimates of postures in the job

    Access Status
    Fulltext not available
    Authors
    Trask, C.
    Mathiassen, Svend
    Rostami, M.
    Date
    2015
    Type
    Journal Article
    
    Metadata
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    Citation
    Trask, C. and Mathiassen, S. and Rostami, M. 2015. Partly visible periods in posture observation from video: Prevalence and effect on summary estimates of postures in the job. Applied Ergonomics. 49: pp. 63-69.
    Source Title
    Applied Ergonomics
    DOI
    10.1016/j.apergo.2015.02.001
    ISSN
    0003-6870
    School
    School of Physiotherapy and Exercise Science
    URI
    http://hdl.handle.net/20.500.11937/68593
    Collection
    • Curtin Research Publications
    Abstract

    © 2015 Elsevier Ltd and The Ergonomics Society. This paper investigated the extent to which observers rated clearly visible postures on video differently from partly visible postures, and whether visibility affected full-shift posture summaries. Trunk and upper arm postures were observed from 10,413 video frames representing 80 shifts of baggage handling; observers reported postures as fully or only partly visible. Postures were summarized for each shift into several standard metrics using all available data, only fully visible frames, or only partly visible frames. 78% of trunk and 70% of upper arm postural observations were inferred. When based on all data, mean and 90th percentile trunk postures were 1.8° and 5.6° lower, respectively, than when based only on fully visible situations. For the arm; differences in mean and 90th percentile were 0.7° and 8.2°. Daily posture summaries were significantly influenced by whether partly visible postures are included or not.

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