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CISDOC database
| Document ID (ISN) | 56045 |
| CIS number |
91-993 |
| ISSN - Serial title |
0018-7208 - Human Factors |
| Year |
1990 |
| Convention or series no. |
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| 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 Province | USA |
| Subject(s) |
Personal protection
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| Broad subject area(s) |
Physical hazards
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| Browse category(ies) |
Hearing protection
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