Auditory perception with ear and cold weather face protection worn in combination

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Authors
  1. Abel, S.M.
  2. Odell, P.
Corporate Authors
Defence R&D Canada - Toronto, Toronto ONT (CAN)
Abstract
The effect on hearing thresholds, sound attenuation and consonant discrimination of wearing a balaclava under hearing protective earmuffs was studied. This combination is common during cold weather military operations. One group of 20 normal-hearing adults, half male and half female, were tested. Measurements were made within subject of diffuse-field hearing thresholds from 0.25 kHz to 8 kHz, and consonant discrimination in quiet, with the ears unoccluded and protected with the earmuffs alone and with the balaclava worn full face or rolled. Attenuation was derived from the protected and unoccluded thresholds at each frequency. When the balaclava was worn full face, attenuation decreased by 16-18 dB relative to the muff alone, below 6.3 kHz. With the balaclava worn as a cap, there was an inverted U-shaped decrement in attenuation of 18 -27 dB from 0.25 Hz to 4 kHz. Consonant discrimination decreased by 7% for the muffs alone. These findings underscore the importance of assessing protective equipment under the same conditions as they will be worn.
Keywords
personal hearing protection;balaclava
Report Number
DRDC-TORONTO-SL-2005-129 — Scientific Literature
Date of publication
01 Oct 2006
Number of Pages
6
DSTKIM No
CA032671
CANDIS No
531851
Format(s):
Electronic Document(PDF)

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