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Document ID (ISN)55075
CIS number 90-2036
ISSN - Serial title Cahiers de notes documentaires - Sécurité et hygiène du travail
Year 1989
Convention or series no.
Author(s) Campo P., Cnockaert J.C.
Title Effect of noise during pregnancy on foetal hearing - Review
Original title Risques auditifs encourus par le f¿tus chez la femme enceinte exposée au bruit - Etude bibliographique [in French]
Bibliographic information 4th Quarter 1989, No.137, Note No.1756-137-89, p.633-637. 30 ref.
Abstract Literature review on the effects of noise on the inner ear (cochlea) of the foetus in pregnant women exposed to noise. The last 3 months of pregnancy are the 'critical period' during which the cochlea seems particularly susceptible to noise. Prolonged exposures to high noise levels, even below the 85dB(A) legal limit, can produce hearing loss in the foetus. Surrounding material tissue can attenuate noise exposure in the foetus by 20-30dB at frequencies above 500Hz. Low frequencies (<500Hz) are far less attenuated and therefore are more dangerous for the foetus. The A weighting is therefore not well adapted to estimate the harmfulness of a pre-natal noise exposure. In the absence of more data, it is recommended that the noise exposure of pregnant women be limited, especially during the last 3 months of pregnancy, and when there is much noise at frequencies <500Hz.
Descriptors (primary) noise; expectant mothers; embryotropic effects; hearing level
Descriptors (secondary) literature survey; hearing loss; hearing disorders
Document type D - Periodical articles
Country / State or ProvinceFrance
Subject(s) Noise, hearing and vibration
Broad subject area(s) Physical hazards
Browse category(ies) Antifertility and prenatal effects
Noise
Genetic factors in reaction to exposures