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Related Experiment Videos

A method of measuring fingertip loading during keyboard use

D Rempel1, J Dennerlein, C D Mote

  • 1Ergonomics Laboratory, University of California, San Francisco.

Journal of Biomechanics
|August 1, 1994
PubMed
Summary

Researchers studied fingertip forces and motion during typing. Keystroke analysis revealed distinct phases and peak forces, suggesting a ballistic model for finger movement during computer keyboard use.

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Area of Science:

  • Biomechanics
  • Human-Computer Interaction
  • Ergonomics

Background:

  • Understanding the biomechanics of typing is crucial for optimizing keyboard design and preventing repetitive strain injuries.
  • Previous research has primarily focused on overall typing speed and accuracy, with less emphasis on the detailed force dynamics of individual keystrokes.

Purpose of the Study:

  • To quantitatively analyze the contact forces and motion dynamics between the fingertip and a standard keyboard key during typing.
  • To identify distinct phases within a single keystroke event and characterize the forces and velocities involved.

Main Methods:

  • Instrumentation of a single keycap with a piezoelectric load cell to measure contact forces.
  • Utilizing a high-speed video motion analysis system to record fingertip kinematics.

Related Experiment Videos

  • Recording and analyzing force histories and motion data from four subjects typing standard text for five minutes.

    • Main Results:

    • Each keystroke force history exhibited three distinct phases: keyswitch compression, finger impact, and fingertip pulp compression/release.
    • Two relative force maxima were consistently observed within each keystroke, occurring during finger impact and fingertip pulp compression.
    • Subject mean peak forces ranged from 1.6 to 5.3 N, with mean peak fingertip velocities between 0.3 and 0.7 m/s.

    Conclusions:

    • The distinct phases and force profiles suggest a complex mechanical interaction during typing.
    • The measured forces and velocities support a ballistic model for finger motion, indicating a primarily unguided trajectory after initial propulsion.
    • These findings provide valuable data for biomechanical modeling of typing and inform ergonomic considerations for keyboard design.