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Document ID (ISN)56045
CIS number 91-993
ISSN - Serial title 0018-7208 - Human Factors
Year 1990
Convention or series no.
Author(s) Casali J.G., Park M.Y.
Title Attenuation performance of four hearing protectors under dynamic movement and different user fitting conditions
Bibliographic information Feb. 1990, Vol.32, No.1, p.9-25. Illus. 23 ref.
Abstract To determine the effects of movement and fitting procedures on protection levels afforded by 4 hearing protection devices (HPDs), psychophysical attenuation measurements were made before, during, and after a 2-hr wearing stint that included periods of vigorous work activity or chewing. The 40 subjects, who were non-users of HPDs, initially fit the protectors according to either the instructions on the package (subject fit) or after receiving interactive training on proper fit (trained fit). The subject-fit HPDs gave less protection at 1000Hz and below for a premolded polymer earplug, a user-molded foam earplug, and a double protector consisting of a muff over the foam plug. The muff alone was more resilient to fitting effects than were the plugs. Movement caused a reduction in attenuation for the premolded plug, muff, and muff-plug combination. The compliant foam earplug was largely resistant to either type of movement effect but did benefit more than the other devices from the trained-fit procedure.
Descriptors (primary) evaluation of equipment; hearing protection
Descriptors (secondary) human experiments
Document type D - Periodical articles
Country / State or ProvinceUSA
Subject(s) Personal protection
Broad subject area(s) Physical hazards
Browse category(ies) Hearing protection