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Measuring and characterizing force exposures during computer mouse use.

P W Johnson1, M Hagberg, E W Hjelm

  • 1Department of Occupational Medicine, Sahlgrenska University Hospital, Göteborg, Sweden.

Scandinavian Journal of Work, Environment & Health
|December 5, 2000
PubMed
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Accurately measure computer mouse forces during actual work for exposure assessment. Standardized tasks can identify higher force users, but subjects cannot accurately simulate mouse forces.

Area of Science:

  • Ergonomics and Human Factors
  • Occupational Health and Safety
  • Biomechanics

Background:

  • Computer mouse use is prevalent in many occupations.
  • Understanding finger force exposures is crucial for preventing musculoskeletal disorders.
  • Existing methods for assessing mouse forces may lack accuracy or practicality.

Purpose of the Study:

  • To develop and validate a sampling strategy for characterizing finger force exposures during computer mouse use.
  • To establish reliable methods for measuring forces applied to computer mice.
  • To inform the design of effective exposure assessment studies.

Main Methods:

  • Measured mouse forces from 16 participants (8 male, 8 female) over 3 days at their workstations.
  • Recorded forces during regular work, standardized tasks, and simulated mouse use.

Related Experiment Videos

  • Analyzed force variations across time and task types.

    • Main Results:

    • Mouse forces showed no significant variation between hours or days.
    • During regular work, mouse use occurred frequently (78.0 times/hour), occupying 23.7% of worktime.
    • Mean applied forces were low, but standardized tasks yielded different force profiles than regular work, with moderate-to-strong correlations observed.

    Conclusions:

    • Accurate absolute force assessment requires measuring forces during actual work.
    • Standardized tasks can assess relative exposure and identify high-force users, but not absolute forces.
    • Subjects are unable to accurately simulate their typical mouse forces.