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Related Experiment Videos

Computer users' postures and associations with workstation characteristics.

F Gerr1, M Marcus, D Ortiz

  • 1Department of Environmental and Occupational Health, Rollins School of Public Health, Emory University, Atlanta, GA 30322, USA. fgerr@sph.emory.edu

AIHAJ : a Journal for the Science of Occupational and Environmental Health and Safety
|April 27, 2000
PubMed
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Workstation dimensions do not strongly determine computer operator posture. Many users adopt non-neutral neck, shoulder, and wrist postures, challenging common ergonomic recommendations for neutral positioning.

Area of Science:

  • Ergonomics
  • Occupational Health
  • Human-Computer Interaction

Background:

  • Assessing the relationship between physical workstation characteristics and operator posture is crucial for preventing musculoskeletal disorders.
  • Previous research often assumes that specific workstation dimensions lead to neutral postures, but empirical evidence is mixed.

Purpose of the Study:

  • To investigate the extent to which physical workstation dimensions and characteristics influence operator posture.
  • To determine if computer operators maintain neutral upper limb postures during keying tasks.
  • To identify specific workstation factors that systematically affect worker posture.

Main Methods:

  • Measured operator head, neck, and upper extremity postures using manual goniometers.
  • Evaluated workstation dimensions through direct measurement and workstation characteristics via observation.

Related Experiment Videos

  • Collected data from 379 computer operators.

    • Main Results:

    • Observed significant variability in operator postures, exceeding predictions based on workstation geometry.
    • Found weak correlations between most workstation dimensions and operator postures, with a stronger link between keyboard height and elbow height.
    • Identified that wrist rest use was associated with reduced wrist flexion, but adjustable chairs did not significantly alter posture.
    • Reported that 61% of operators exhibited non-neutral shoulder postures and 41% had non-neutral wrist postures.

    Conclusions:

    • Physical workstation dimensions are not primary determinants of neck and upper extremity postures for computer operators.
    • Only certain workstation characteristics, like wrist rest use, appear to influence posture.
    • A substantial percentage of computer users do not achieve neutral postures, contradicting widely accepted ergonomic guidelines.