To investigate the association between long-term exposure to high-level urban traffic noise and blood pressure in preschool children.
Normotensive children (n=1542), aged 3-7 years and attending kindergartens, had their blood pressures and heart rate measured.
Mean values of these circulatory variables were related to 24-h equivalent traffic noise emission levels measured near their kindergartens and homes.
Supine systolic (5BP) and diastolic blood pressure (DBP) were measured by a Doppler ultrasonic device, heart rate by palpitation.
Weighted average sound pressure levels were measured for 24h a working day at 275 places in the city.
An anthropometric investigation was performed.
Demographic, socio-economic and health status questionnaires were completed by the parents of the children.
Children attending kindergartens situated in areas with traffic noise>60 dB (A) had higher mean 5BP and DBP and lower mean heart rate than children in quiet areas.
Noise at kindergartens had a greater impact than at homes.
Medium-and high-level urban traffic noise [>60dB (A) ] near kindergartens is associated in preschool children with higher mean 5BP and DBP, and with a higher incidence of children with blood pressure values above the respective 95th centiles.
The increase in DBP could be ascribed to the rise in peripheral vascular tone and the decrease in heart rate, possibly owing to activation of a baroreceptor mechanism.
Mots-clés Pascal : Pression artérielle, Rythme cardiaque, Pollution, Corrélation, Enfant, Age préscolaire, Milieu urbain, Bruit, Trafic routier, Exposition, Facteur milieu, Homme, Appareil circulatoire, Coeur
Mots-clés Pascal anglais : Arterial pressure, Heart rate, Pollution, Correlation, Child, Preschool age, Urban environment, Noise, Road traffic, Exposure, Environmental factor, Human, Circulatory system, Heart
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 95-0343009
Code Inist : 002B30A02B. Création : 01/03/1996.