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Upper extremity biomechanics in computer tasks differ by gender.

Erik J Won1, Peter W Johnson, Laura Punnett

  • 1Department of Environmental Health, Harvard School of Public Health, 665 Huntington Avenue, Boston, MA 02115, USA.

Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology
|January 22, 2008
PubMed
Summary
This summary is machine-generated.

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Gender and anthropometry significantly influence upper extremity biomechanics during computer tasks. Even with ergonomic adjustments, women and smaller individuals experience higher forces and muscle activity, suggesting a need for scaled computer input devices.

Area of Science:

  • Ergonomics and Human Factors
  • Biomechanical Engineering
  • Occupational Health

Background:

  • Current ergonomic guidelines aim to optimize computer workstation setups for user comfort and safety.
  • However, individual differences in anthropometry and gender may lead to persistent biomechanical stress despite adherence to guidelines.

Purpose of the Study:

  • To investigate gender-specific differences in upper extremity postures, applied forces, and muscle activity during standardized computer tasks.
  • To assess how anthropometric variations (shoulder width, arm length) interact with gender to influence these biomechanical factors.

Main Methods:

  • Fifteen men and 15 women performed five computer tasks at an adjustable workstation.
  • Measurements included surface electromyography for muscle activity, motion analysis for joint postures, and load cells/force-sensing mouse for applied forces.

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  • The position of the mouse was varied to simulate different ergonomic scenarios.

    • Main Results:

    • Women exhibited higher relative forces, normalized muscle activity in forearm muscles, and greater range of motion in wrist and shoulder joints compared to men.
    • Gender differences in forces and muscle activity were amplified when subjects were grouped by anthropometry, with smaller individuals showing higher values.
    • Postural differences between genders varied with mouse position, increasing in a 'high' position and decreasing in a 'center' position.

    Conclusions:

    • Standard ergonomic adjustments do not fully eliminate gender-based differences in upper extremity biomechanics during computer use.
    • Anthropometric scaling of computer input devices may be necessary to further reduce biomechanical stress, particularly for smaller-statured individuals.