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Related Experiment Videos

Keyboard operating posture and actuation force: implications for muscle over-use.

M J Rose1

  • 1Melbourne & Metropolitan Board of Works, Australia.

Applied Ergonomics
|June 1, 1991
PubMed
Summary

Keyboard overuse injuries often affect finger extensor muscles due to sustained isometric contractions. This study determined a minimum keypress force to allow muscle relaxation, aiding in preventing such injuries.

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Area of Science:

  • Occupational health
  • Biomechanics
  • Ergonomics

Background:

  • Keyboard operator overuse syndromes frequently impact wrist and finger extensor muscles.
  • Biomechanical analysis reveals sustained isometric muscle contractions during keyboard use.

Purpose of the Study:

  • To determine the minimum keypress force required to facilitate relaxation of finger extensor muscles.
  • To predict an optimal key activation force based on population relaxed finger weights.

Main Methods:

  • Measured maximum relaxed finger press forces in 60 subjects.
  • Evaluated three different arm support methods.
  • Calculated the 95th percentile predicted population relaxed finger weights.

Main Results:

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  • The predicted minimum key activation force is 0.8 newtons.
  • This force value aligns with previously proposed performance criteria.
  • The determined force is considered practical for commercial application.

Conclusions:

  • A keypress force of 0.8 newtons is recommended to support finger extensor muscle relaxation.
  • Implementing this force can help mitigate overuse syndromes in keyboard operators.
  • The findings offer practical guidance for keyboard design and ergonomic standards.