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Analyses on the E-A-R Foam Earplug for the Dynamic Work Activity Experiment.


PB92124015

Publication Date 1990
Personal Author Casali, J. G.; Park, M. Y.
Page Count 33
Abstract A controlled laboratory experiment was conducted to investigate the effects of different levels of subject fit, wearing time, and subject movement activity, on the frequency specific attenuation achieved with particular slow recovery foam earplugs. A psychophysical real ear attenuation at threshold testing procedure was used to collect attenuation data from ten subjects at nine test frequencies. While prior research suggested that attenuation may decrease over time with aural inserts, these compliant inserts were stable in the face of vigorous temporomandibular and highly kinetic bodily activity, thus exhibiting negligible degradation in attenuation over time. Improvements in attenuation provided by trained subject fit versus naive subject fit of the earplugs were large at 1000 hertz (Hz) and below, ranging from gains of 12 to 14 decibels (dB). The gains were smaller, but still statistically at 2000 to 8000Hz, ranging from 3 to 5dB.
Keywords
  • Ear protectors
  • Occupational exposure
  • Noise
  • Noise-induced hearing loss
  • Analysis of variance
  • Frequencies
  • Sensory thresholds
  • Psychophysics
  • Dynamic work activity experiment
Source Agency
  • National Institute for Occupational Safety and Health
NTIS Subject Category
  • 57U - Public Health & Industrial Medicine
  • 57S - Physiology
  • 44G - Environmental & Occupational Factors
  • 95D - Human Factors Engineering
Corporate Authors Virginia Polytechnic Inst. and State Univ., Blacksburg. Dept. of Industrial Engineering and Operations Research.; National Inst. for Occupational Safety and Health, Cincinnati, OH.
Supplemental Notes See also PB82-219189. Sponsored by National Inst. for Occupational Safety and Health, Cincinnati, OH.
Document Type Technical Report
Title Note Final rept.
NTIS Issue Number 199206
Analyses on the E-A-R Foam Earplug for the Dynamic Work Activity Experiment.
Analyses on the E-A-R Foam Earplug for the Dynamic Work Activity Experiment.
PB92124015

  • Ear protectors
  • Occupational exposure
  • Noise
  • Noise-induced hearing loss
  • Analysis of variance
  • Frequencies
  • Sensory thresholds
  • Psychophysics
  • Dynamic work activity experiment
  • National Institute for Occupational Safety and Health
  • 57U - Public Health & Industrial Medicine
  • 57S - Physiology
  • 44G - Environmental & Occupational Factors
  • 95D - Human Factors Engineering
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