Traffic Noise Causes Stroke

In a survey involving 50,000 people showed that every increase of 10 decibels (unit of sound intensity) road noise increases 14 percent chance of stroke for an average of all age groups.For those aged under 65 years, the stakes are not too significant, but the risk of large increases in the age group above 65 years which increased 27 percent for every increase of 10 decibels.To sound above 60 decibels, even bigger danger of stroke, the researchers said.A busy road usually generate noise levels of 70-80 decibels, as a comparison lawn mower or chainsaw produces 90-100 decibels while the aircraft that take off can create up to 120 decibels."Previous studies linking the traffic noise pollution with increased blood pressure and heart attacks," said the head of the Danish Cancer Society study, Metta Sorensena."Our research shows that exposure to road traffic noise seems to increase the risk of stroke."The study reviewed the medical history and residence of the 51,485 people who participated in the survey Danish Diet, Cancer and Health conducted in Copenhagen and surrounding areas between 1993-1997.Eight percent of all stroke cases and 19 percent of cases of stroke in those aged above 65 years can be caused by traffic noise according to the report.The researchers estimated the noise as a "stressor" and disruption to sleep that result in increased blood pressure and heart rate and also increase the level of stress hormones.The study took into account the impact of air pollution, exposure in the train and aircraft as well as various lifestyle factors that may interfere such as smoking, diet and alcohol consumption.Community groups who participated in the survey were mostly living in urban areas and do not reflect the entire population in terms of exposure over the traffic noise.Proximity to the road noise is also related to social class because the richer citizens can live in a quieter place.