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Analyses on the E-A-R Foam Earplug for the Dynamic Work Activity Experiment.
Department of Industrial Engineering and Operations Research, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 1990 Jan:32 pages
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.
NIOSH-Grant; Noise-induced-hearing-loss; Ear-protectors; Personal-protective-equipment; Hearing-impairment; Hearing-protection;
Indus Engr and Operations Res Virginia Polytechnic Institute Blacksburg, VA Blacksburg, VA 24061
Final Grant Report;
NTIS Accession No.
Hearing Loss; Disease and Injury; Noise-induced-hearing-loss; Control Technology and Personal Protective Equipment; Research Tools and Approaches;
Department of Industrial Engineering and Operations Research, Virginia Polytechnic Institute and State University, Blacksburg, Virginia
Virginia Polytechnic Inst and St Univ, Blacksburg, Virginia
Page last reviewed: May 5, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division