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Shoulder muscle loading and task performance at head level on ladders versus mobile elevated work platforms

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dc.contributor.author Phelan, Denis
dc.contributor.author O'Sullivan, Leonard
dc.date.accessioned 2017-04-10T13:39:21Z
dc.date.available 2017-04-10T13:39:21Z
dc.date.issued 2014
dc.identifier.uri http://hdl.handle.net/10344/5677
dc.description peer-reviewed en_US
dc.description.abstract A high incidence of Musculoskeletal Disorders (MSDs) has been reported in the construction sector. The use of ladders in the workplace has long been identified as a significant risk that can lead to workplace accidents. However, it is unclear if platform types have an effect on the physical risk factors for MSDs in overhead work. The aim of this study is to perform a pilot study on the effects of hand activity on both shoulder muscle loading and task performance while working on ladders versus Mobile Elevated Working Platforms (MEWPs). It is hypothesised that work on ladders would result in greater muscle loading demands, increased levels of discomfort and reduced performance due to the restrictions on postures that could be adopted. A field study (n=19) of experienced electricians on a construction site found that workers spent approximately 28% of their working time on ladders versus 6% on MEWPs. However, the durations of individual tasks were higher on MEWPs (153 seconds) than on ladders (73 seconds). Additionally, maximum levels of perceived discomfort (on a VAS 0-100) were reported for the shoulders (27), neck (23), and lower regions of the body (22). A simulated study (n= 12) found that task performance and discomfort were not significantly different between platform types (ladder vs. MEWP) when completing either of three tasks: cabling, assembly and drilling. However, platform and task had significant effects (p<0.05) on median and peak electromyograpic (EMG) activity of the anterior deltoid and upper trapezius. EMG amplitudes were higher for the deltoid than the upper trapezius. For the deltoid, the peak percentile amplitudes were, on average, higher for ladder work over MEWP work for the hand intensive cabling (32 vs. 27% Maximal Voluntary Exertion (MVE)) and the assembly task (19 vs. 6% MVE). Conversely, for drilling the peak percentile EMG amplitudes were marginally lower for ladder compared to the MEWP (3.9 vs. 5.1% MVE). The general implication was that working on the MEWP involved lower shoulder muscle loading for cabling and assembly task. A difference due to platform type was not present for drilling work. en_US
dc.language.iso eng en_US
dc.publisher Elsevier en_US
dc.relation.ispartofseries Applied Ergonomics: 45 (6), pp. 1384-1391
dc.relation.uri http://doi.org/10.1016/j.apergo.2014.03.007
dc.rights This is the author’s version of a work that was accepted for publication in Applied Ergonomics. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Applied Ergonomics, 2014, 45 (6), pp. 1384-1391,http://doi.org/10.1016/j.apergo.2014.03.007
dc.subject electrical work en_US
dc.subject overhead en_US
dc.subject shoulder loading en_US
dc.title Shoulder muscle loading and task performance at head level on ladders versus mobile elevated work platforms en_US
dc.type info:eu-repo/semantics/article en_US
dc.type.supercollection all_ul_research en_US
dc.type.supercollection ul_published_reviewed en_US
dc.date.updated 2017-04-10T13:34:05Z
dc.description.version ACCEPTED
dc.identifier.doi 10.1016/j.apergo.2014.03.007
dc.rights.accessrights info:eu-repo/semantics/openAccess en_US
dc.internal.rssid 1565032
dc.internal.copyrightchecked Yes
dc.identifier.journaltitle Applied Ergonomics
dc.description.status peer-reviewed


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