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Keyboard design through physiological strain measurements.

P Zipp1, E Haider, N Halpern

  • 1Institut für Arbeitswissenschaft der Technischen Hochschule, Petersenstr 30, 6100 Darmstadt, Fed. Rep. Germany.

Applied Ergonomics
|June 1, 1983
PubMed
Summary
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For typing tasks, myoelectric activity analysis determined safe joint positions. A split keyboard, rotated and inclined, is recommended for long-term computer use to prevent strain.

Area of Science:

  • Ergonomics
  • Biomechanics
  • Human-Computer Interaction

Background:

  • Typing tasks can lead to musculoskeletal discomfort and injury.
  • Understanding the physiological limits of upper extremity joints is crucial for designing effective ergonomic solutions.
  • Previous research has explored keyboard design, but detailed analysis of joint positioning during typing is ongoing.

Purpose of the Study:

  • To investigate the physiologically tolerable range of joint positions for upper extremities during typing.
  • To provide evidence-based recommendations for ergonomic keyboard design to minimize strain during prolonged typing tasks.

Main Methods:

  • Recording myoelectric activities of muscles involved in typing.
  • Analyzing joint positions and their correlation with muscle exertion.

Related Experiment Videos

  • Utilizing physiological data to define safe and comfortable movement ranges.

    • Main Results:

    • Identified specific joint angle ranges that are physiologically tolerable during typing.
    • Demonstrated that current typing postures may exceed these tolerable ranges for some individuals.
    • Established a basis for ergonomic keyboard design principles.

    Conclusions:

    • A split keyboard design is recommended for long-term typing to reduce physiological stress.
    • Optimal keyboard configuration involves rotating key fields horizontally and inclining them laterally.
    • Implementing these design principles can enhance user comfort and potentially reduce the risk of repetitive strain injuries.