Abstract
Four hearing protectors—a foam‐cushion earmuff, foam and triple‐flanged polymer earplugs, and an earmuff over foam earplug combination—were evaluated to determine the effects of wearing time, movement activity, and fitting procedure on spectral attenuation. Using a psychophysical real‐ear‐attenuation‐at‐threshold measurement procedure (as per ANSI S12.6‐1984), attenuation data were collected from 40 naive subjects before, during, and after the activity movement tasks, which induced highly kinematic subject movements. Loss in attenuation over the 2‐h wearing period was up to 6 dB for all devices except the foam earplug, and all protectors except the earmuff significantly improved protection (from 4 to 14 dB) at 1000 Hz and below due to trained fitting. The foam plug benefited more than other devices from the training for proper fitting but was resilient to subject movement. [Work supported by NIOSH‐NIH.]
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