Insert-type hearing protector stability as a function of controlled jaw movement.
Samples of five insert-type hearing protectors (three viscose foam, one poly-flanged, and one glass fiber) were evaluated for change in attenuation as a result of 30 min of controlled jaw movement. Protected-ear, narrow-band noise thresholds were obtained at octave intervals (between 0.25 and 4.0 kHz) before and after the jaw-movement activity. Frequency and interaction effects were not significant. Protector effects were significant beyond the 0.01 level of probability that chance caused the observed differences. As a group, the viscose foam protectors were more stable than the others. The most stable protector was E.A.R., and the least stable was Bilsom Soft.
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Department of Speech and Hearing Science, Arizona State University, Tempe 85287-0102.
D000328:Adult; D001309:Auditory Threshold; D004430:Ear Protective Devices; D004867:Equipment Design; D005260:Female; D006801:Humans; D007568:Jaw / Q000502:physiology*; D008297:Male; D008409:Mastication; D011482:Protective Devices