Neoprene wet-suit hood affects low-frequency underwater hearing thresholds.
Aviat Space Environ Med
; 75(5): 397-404, 2004 May.
Article
de En
| MEDLINE
| ID: mdl-15152891
ABSTRACT
INTRODUCTION:
Psychophysical measures of wet-suit hood sound attenuation are needed to provide the diving community with guidance on protection from underwater sound.METHODS:
Underwater hearing thresholds were obtained from 15 male and 5 female recreational divers with and without a 3-mm thick wet-suit hood. Dives were conducted at a depth of 1 m in a large quiet anechoic pool. Thresholds were determined using a two-interval forced-choice procedure with a 0.71 probability of positive response at convergence. A 1-s pure tone was presented with a 20-ms rise and fall time at 100, 200, 250, 300, 400, and 500 Hz.RESULTS:
Without a wet-suit hood, mean thresholds decreased from 99 dB re 1 microPa at 100 Hz to 85 dB at 500 Hz. Thresholds were statistically similar at 100 to 300 Hz with and without the wet-suit hood, but were significantly increased at 400 and 500 Hz with the hood (p < 0.001).CONCLUSIONS:
In conclusion, at shallow depths, a 3-mm neoprene wet-suit hood attenuates underwater sound by approximately 10 dB for frequencies between 400 Hz and 500 Hz. At frequencies below 400 Hz, a 3-mm neoprene wet-suit hood offers no sound protection.
Recherche sur Google
Collection:
01-internacional
Base de données:
MEDLINE
Sujet principal:
Seuil auditif
/
Plongée
/
Dispositifs de protection de la tête
Limites:
Adult
/
Female
/
Humans
/
Male
Langue:
En
Journal:
Aviat Space Environ Med
Année:
2004
Type de document:
Article
Pays d'affiliation:
États-Unis d'Amérique
Pays de publication:
EEUU
/
ESTADOS UNIDOS
/
ESTADOS UNIDOS DA AMERICA
/
EUA
/
UNITED STATES
/
UNITED STATES OF AMERICA
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US
/
USA