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Effect of aviation snip design and task height on upper extremity muscular activity and wrist posture.

Anton-D; Rosecrance-JC; Gerr-F; Reynolds-J; Meyers-A; Cook-T
J Occup Environ Hyg 2007 Jan; 4(2):99-113
Hand tools described as ergonomic in design are intended to reduce exposure to physical risk factors associated with work-related musculoskeletal disorders. Additionally, using the right tool for the job is believed to reduce exposure and, consequently, risk of disease. Sheet metal workers frequently use a cutting tool called aviation snips when fabricating and installing ductwork. The purpose of this laboratory simulation study was to determine the effect of (1) aviation snip design; and (2) work height on muscle activity, wrist posture, and user satisfaction among sheet metal workers. We hypothesized that specific aviation snips designs would be most appropriate for use at specific heights. Twenty-three sheet metal workers used three different designs of aviation snips to make curved cuts in sheet metal placed both at waist height and shoulder height. Conventional circular snips, straight snips, and an alternate design of offset snips were used. Upper extremity muscle activity was measured with surface electromyography, wrist posture was measured with electrogoniometry, and user satisfaction was rated by the participants on a survey. Statistically significant effects of snip design and task height on muscle activity, wrist posture, and user satisfaction were observed. However, no snip was preferable for all dependent variables. Work height had a greater effect on muscle activity and wrist posture than snip design. Field studies are indicated to determine the long-term effect of snip design on physical risk factors and risk of musculoskeletal disorders
Construction; Construction-equipment; Construction-industry; Construction-materials; Construction-workers; Equipment-reliability; Ergonomics; Hand-injuries; Hand-tools; Muscular-disorders; Musculoskeletal-system; Musculoskeletal-system-disorders; Risk-analysis; Risk-factors; Injuries; Disease-control; Disease-incidence; Disease-prevention; Disease-transmission; Diseases; Hand-protection; Hazards; Health-hazards; Health-protection; Health-standards; Safety-education; Safety-helmets; Safety-measures; Safety-monitoring; Safety-personnel; Safety-practices; Safety-programs; Work-analysis; Work-environment; Work-operations; Work-practices; Worker-health; Workers; Workplace-monitoring; Workshops; Author Keywords: construction; ergonomics; hand tools; intervention effectiveness; musculoskeletal disorders
Dan Anton, 138 IREH, Oakdale Campus, Department of Occupational and Environmental Health, The University of Iowa, Iowa City, IA, 52242-5000
Publication Date
Document Type
Journal Article
Email Address
Funding Type
Fiscal Year
Identifying No.
Grant-Number-T01-CCT-810435; Grant-Number-T42-OH-008491
Issue of Publication
Source Name
Journal of Occupational and Environmental Hygiene
Performing Organization
Colorado State University, Fort Collins, Colorado
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division