National Technical Reports Library

The National Technical Information Service acquires, indexes, abstracts, and archives the largest collection of U.S. government-sponsored technical reports in existence. The NTRL offers online, free and open access to these authenticated government technical reports. Technical reports and documents in its repository may be available online for free either from the issuing federal agency, the U.S. Government Publishing Office’s Federal Digital System website, or through search engines.

Details

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

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