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Related Experiment Videos

Wrist support during typing--a controlled, electromyographic study.

T Bendix1, F Jessen

  • 1Laboratory for Back Research, Medical Dept TTA, Rigshospitalet, University of Copenhagen, Denmark.

Applied Ergonomics
|September 1, 1986
PubMed
Summary
This summary is machine-generated.

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Wrist supports increase trapezius muscle load during touch-typing, especially when elevated. Despite this, most secretaries preferred them, though typing performance was unaffected. Key positioning is crucial for comfort.

Area of Science:

  • Ergonomics
  • Occupational Health
  • Biomechanics

Background:

  • Repetitive strain injuries are common in office workers.
  • The use of wrist supports during typing is a debated ergonomic intervention.
  • Understanding muscle load is key to preventing pain.

Purpose of the Study:

  • To investigate the effects of wrist support on muscle load during touch-typing.
  • To assess the impact of wrist support height on muscle strain.
  • To evaluate typing performance and user preference.

Main Methods:

  • 12 secretaries with existing muscle pain participated.
  • Muscle loads (trapezius, radial extensor) were measured during 15-minute typing sessions.
  • Four experimental conditions varied wrist support presence and height.

Related Experiment Videos

  • Typing performance and body movements were monitored.

    • Main Results:

    • Trapezius muscle load significantly increased with wrist support, particularly at higher settings.
    • Radial extensor muscle load showed no significant change.
    • Most participants preferred using wrist support despite increased trapezius load.
    • Typing performance and body movements remained unaffected by wrist support.

    Conclusions:

    • Wrist supports may increase trapezius muscle strain during touch-typing.
    • User preference for wrist support exists despite potential ergonomic drawbacks.
    • Low keyboard positioning is recommended for optimal touch-typing ergonomics.