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Effects of combined wrist flexion/extension and forearm rotation and two levels of relative force on discomfort

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dc.contributor.author Khan, Abid Ali
dc.contributor.author O'Sullivan, Leonard
dc.date.accessioned 2017-04-12T13:39:28Z
dc.date.available 2017-04-12T13:39:28Z
dc.date.issued 2009
dc.identifier.uri http://hdl.handle.net/10344/5701
dc.description peer-reviewed en_US
dc.description.abstract This study investigated perceived discomfort in an isometric wrist flexion task. Independent variables were wrist flexion/extension (55%, 35% flexion, neutral, 35% and 55% extension ranges of motion (ROM)), forearm rotation (60%, 30% prone, neutral, 30% and 60% supine ROM) and two levels of flexion force (10% and 20% maximum voluntary contraction (MVC)). Discomfort was significantly affected by flexion force, forearm rotation and a two-way interaction of force with forearm rotation (each p˂ 5 0.05). High force for 60%ROM forearm pronation and supination resulted in increasingly higher discomfort for these combinations. Flexion forces were set relative to the MVC in each wrist posture and this appears to be important in explaining a lack of significant effect (p = 0.34) for flexion/extension on discomfort. Regression equations predicting discomfort were developed and used to generate iso-discomfort contours, which indicate regions where the risk of injury should be low and others where it is likely to be high. Regression equations predicting discomfort and iso-discomfort contours are presented, which indicate combinations of upper limb postures for which discomfort is predicted to be low, and others where it is likely to be high. These are helpful in the study of limits for risk factors associated with upper limb musculoskeletal injury in industry. en_US
dc.language.iso eng en_US
dc.publisher Taylor and Francis en_US
dc.relation.ispartofseries Ergonomics;52 (10), pp. 1265-1275
dc.relation.uri http://dx.doi.org/10.1080/00140130903040208
dc.rights This is an Author's Manuscript of an article whose final and definitive form, the Version of Record, has been published in Ergonomics 2009 copyright Taylor & Francis, available online at: http://dx.doi.org/10.1080/00140130903040208 en_US
dc.subject wrist and forearm postures en_US
dc.subject musculoskeletal disorders en_US
dc.subject discomfort en_US
dc.title Effects of combined wrist flexion/extension and forearm rotation and two levels of relative force on discomfort 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 2017-04-12T13:22:01Z
dc.description.version ACCEPTED
dc.contributor.sponsor European Union en_US
dc.relation.projectid MIRTH-CT-2001-00574 en_US
dc.rights.accessrights info:eu-repo/semantics/openAccess en_US
dc.internal.rssid 1121365
dc.internal.copyrightchecked Yes
dc.identifier.journaltitle Ergonomics
dc.description.status peer-reviewed


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