The discomfort threshold problem is not yet clear from the audiological point of view.
Its significance for work physiology and hygiene is not enough clarified.
This paper discusses the results of a study of the discomfort threshold, performed including 385 operators from the State Company « Kremikovtzei », divided into 4 groups (3 groups according to length of service and one control group).
The most prominent changes were found in operators with increased tonal auditory threshold up to 45 and over 50 dB with high confidential probability.
The observed changes are distributed in 3 groups :
1. increased tonal auditory threshold (up to 30 dB) withoyt decrease of the discomfort threshold ;
2. decreased discomfort threshold (with about 15/20 dB) at increased tonal auditory threshold (up to 45 dB) ;
3. decreased discomfort threshold at increased (over 50 dB) tonal auditory threshold.
The auditory scope of the operators, belonging to groups III and IV (with the longest lenght of service) is narrowed, being distorted for the latter.
This pathophysiological phenomenon can be explained by an enhanced effect of sound irritation and the presence of a recruitement phenomenon with possible engagement of the central part of the auditory analyzer.
It is concluded that the discomfort threshold is a sensitive indicator for the state of the individual norms for speech-sound-noise discomfort. (...)
Mots-clés Pascal : Bruit, Seuil, Confort acoustique, Nuisance acoustique, Exposition professionnelle, Médecine travail, Commande machine, Automatisation, Lieu travail, Physiologie travail, Homme
Mots-clés Pascal anglais : Noise, Threshold, Acoustic quality, Noise pollution, Occupational exposure, Occupational medicine, Machine control, Automation, Work place, Occupational physiology, Human
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 97-0050620
Code Inist : 002B29C01. Création : 21/05/1997.