title: A randomised controlled trial evaluating an alternative mouse and forearm support on upper body discomfort and musculoskeletal disorders among engineers.
abstract: OBJECTIVE
  The aim of this intervention study was to determine the effects of an alternative mouse and/or a forearm support board on the change in upper body discomfort scores and the development of incident musculoskeletal disorders.
  
  
  METHODS
  This randomised controlled intervention trial followed 206 engineers for one year. Participants were randomised to receive (1) a conventional mouse only, (2) an alternative mouse only, (3) a forearm support board, or (4) an alternative mouse plus forearm support board. Outcome measures included weekly upper body discomfort scores and incident musculoskeletal disorders.
  
  
  RESULTS
  During the study, 42 participants were diagnosed with an incident musculoskeletal disorder. The group that received the forearm support board experienced a reduction in their right upper extremity discomfort (beta-coefficient -0.35, 95% CI -0.67 to -0.03) in comparison to those who did not receive a forearm board. The group that received the alternative mouse had a protective, but non-significant (p = 0.20), effect on incident cases of right upper extremity musculoskeletal disorders (HR 0.57, 95% CI 0.24 to 1.34) and a non-significant reduction in neck/shoulder discomfort (beta-coefficient -0.23, 95% CI -0.056 to 0.10) in comparison to those who received a conventional mouse.
  
  
  CONCLUSIONS
  In engineers who use a computer for more than 20 h per week, a forearm support board may reduce right upper extremity discomfort attributed to computer use.
authors.affiliation: Department of Medicine, University of California, San Francisco, 1301 South 46th Street, Building 163, Richmond, CA 94804, USA.
authors.forename: C F
authors.initials: CF
authors.lastname: Conlon
authors.forename: N
authors.initials: N
authors.lastname: Krause
authors.forename: D M
authors.initials: DM
authors.lastname: Rempel
mesh_terms: D000328:Adult; D002140:California; D016287:Computer Peripherals; D006804:Ergonomics; D005260:Female; D005543:Forearm Injuries / Q000209:etiology / Q000517:prevention & control*; D006801:Humans; D008297:Male; D016273:Occupational Exposure / Q000009:adverse effects / Q000517:prevention & control; D016272:Occupational Health; D010146:Pain / Q000209:etiology / Q000517:prevention & control*; D010147:Pain Measurement / Q000379:methods; D011482:Protective Devices / Q000592:standards; D018570:Risk Assessment