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[A new pocket-type flicker apparatus].

T Hosokawa1, T Makizuka, K Nakai

  • 1Department of Hygiene and Preventive Medicine, Hokkaido University School of Medicine.

Sangyo Igaku. Japanese Journal of Industrial Health
|September 1, 1989
PubMed
Summary

A new pocket flicker apparatus offers a portable and affordable method for measuring fatigue by determining critical fusion frequency (CFF). This device shows significant correlation with established methods, making it a practical tool for workplace assessments.

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Area of Science:

  • Ergonomics
  • Psychophysics
  • Biomedical Engineering

Background:

  • Assessing physical fatigue is crucial in occupational health.
  • Existing methods for measuring critical fusion frequency (CFF) can be cumbersome and expensive.
  • There is a need for portable and cost-effective tools for fatigue assessment.

Purpose of the Study:

  • To design, fabricate, and test a novel, inexpensive pocket flicker (P.F.) apparatus for measuring fatigue.
  • To evaluate the performance and portability of the P.F. apparatus compared to existing CFF measurement devices.
  • To establish the reliability and correlation of CFF values obtained from the P.F. apparatus.

Main Methods:

  • Developed a compact P.F. apparatus using a light-emitting diode and variable resistor.

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  • Conducted comparative experiments measuring CFF values simultaneously using the P.F. apparatus, a blinking type apparatus, and a sector type apparatus.
  • Recruited 18 subjects (13 males, 5 females; age 21-52) for a total of 132 measurements.

    • Main Results:

    • The P.F. apparatus demonstrated significant correlation with both blinking and sector type CFF apparatuses.
    • High correlation was observed between the sector type and blinking type apparatuses, though regression slopes indicated systematic differences.
    • Correlation coefficients for the P.F. apparatus were comparable to those between the established CFF measurement methods.

    Conclusions:

    • The pocket flicker apparatus is a viable, portable, and inexpensive tool for measuring critical fusion frequency (CFF).
    • Its compact design and low cost facilitate widespread use in workplace fatigue assessments.
    • Users should be aware of potential data differences when comparing P.F. apparatus results with other CFF measurement devices due to variations in methodology.