Effects of occupational exposure to low frequency noise on cognition.
Previous studies performed on groups of workers employed in the aeronautical industry revealed morphological vascular changes of the central nervous system (CNS) and some difficulty in attention and memory retention.
The goal of this study is, therefore, to determine whether prolonged occupational exposure to large pressure amplitude (>=90 dB SPL) and low frequency (<=500 Hz) (LPALF) noise leads to cognitive deterioration.
We observed 40 male workers employed as aircraft technicians, with average age of 43.3 yr (range 35-56, SD=4.82) occupationally exposed to LPALF noise for a long period of time, average 22 yr (range 13-30, SD=4.90), and 30 educationally-and age-matched male controls.
None of the subjects had a history of alcoholism, and all were drug-free.
The P300 event-related brain potential elicited with an auditory discrimination task was recorded and psychological tests (the Wechsler memory scale and the Toulouse-Piéron test) were performed.
The P300 latency was significantly longer (328.5 vs. 307.5 ms, F=11.7, deg. signif.=0.001) and the amplitude significantly smaller (10.9 vs. 12.6, F=4.3, deg. signif.=0.04) in the exposed group than in the controls.
No significant differences were found in the results of the Toulouse-Piéron test. (...)
Mots-clés Pascal : Bruit, Basse fréquence, Vibration, Nuisance acoustique, Industrie aéronautique, Exposition professionnelle, Traumatisme, Agent physique, Potentiel évoqué, Trouble cognition, Aviation pathologie, Médecine aérospatiale, Facteur milieu, Système nerveux central pathologie, Médecine travail, Homme, Potentiel P300
Mots-clés Pascal anglais : Noise, Low frequency, Vibration, Noise pollution, Aeronautic industry, Occupational exposure, Trauma, Physical agent, Evoked potential, Cognitive disorder, Aviation medicine, Space medicine, Environmental factor, Central nervous system disease, Occupational medicine, Human
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 99-0253212
Code Inist : 002B16M. Création : 16/11/1999.