Journal
APPLIED ERGONOMICS
Volume 43, Issue 2, Pages 408-412Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.apergo.2011.06.015
Keywords
Text messaging; Musculoskeletal disorder
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Funding
- College of Health Professions and Social Work at Temple University
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Mobile device text messaging and other typing is rapidly increasing worldwide. A checklist was utilized to characterize joint postures and typing styles in individuals appearing to be of college age (n = 859) while typing on their mobile devices in public. Gender differences were also ascertained. Almost universally, observed subjects had a flexed neck (91.0%, n = 782), and a non-neutral typing-side wrist (90.3%, n = 776). A greater proportion of males had protracted shoulders (p < 0.01, chi(2) test), while a greater proportion of females had a typing-side inner elbow angle of <90 degrees, particularly while standing (P = 0.03, chi(2) test). 46.1% of subjects typed with both thumbs (two hands holding the mobile device). Just over one-third typed with their right thumb (right hand holding the mobile device). No difference in typing styles between genders was found. Future research should determine whether the non-neutral postures identified may be associated with musculoskeletal disorders. (C) 2011 Elsevier Ltd and The Ergonomics Society. All rights reserved.
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