publicado em 09/10/2013 às 16h07:00
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Aircraft noise studies relate to increased cardiovascular disease

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Exposure to high noise levels in aircraft has been associated with an increased risk of cardiovascular disease in two new studies.

In the first study, researchers compared rates of hospitalization and mortality rates for stroke, coronary heart disease and cardiovascular disease between 2001 and 2005 in 12 London boroughs and nine districts west of the British capital, a region of about 3, 6 million inhabitants, which is close to Heathrow Airport, one of the world's busiest. Levels of aircraft noise for each area were obtained from the Civil Aviation Authority (CAA).

The researchers found an increased risk of stroke, coronary heart disease and cardiovascular disease, for both hospitalizations and mortality, especially among the 2% of the study population exposed to high levels of aircraft noise during the day and evening.

Factors that may have affected the results, such as age, gender, ethnicity, social deprivation, smoking, air pollution and noise from road traffic were also taken into account. The prevalence of people of Asian ethnicity reduced risks observed for hospital admissions for coronary heart disease and cardiovascular disease.

However, the authors were unable to distinguish between reflections at the noises of the night and during the day and say that more research is needed to determine the nighttime noise that disturbs sleep, may be a mechanism underlying these associations.

They stress that more studies are needed to test whether aircraft noise causes these increased risk or if these results can be explained by other factors not measured.

Previous studies on exposure to aircraft noise have examined the risk of hypertension, but few have examined the risk of cardiovascular disease and results are inconsistent.

<b> Seniors are more affected </ b>

In the second study, researchers from the School of Public Health, Boston University analyzed data from more than six million beneficiaries of health plans in the United States. Aged over 65 years all members of the study lived close to 89 U.S. airports.

The researchers found that on average, people exposed to aircraft noise above 10 decibels (dB) had a rate of hospital admission for cardiovascular disease 3.5% higher. The association remained after adjusting for socioeconomic status, demographic factors, air pollution, and proximity to the road.

The results showed that participants exposed to levels above 55 dB had an even stronger association with hospital admissions for cardiovascular disease.

Despite some limitations of the study, the researchers say the results "provide evidence of a statistically significant association between exposure to aircraft noise and cardiovascular health particularly at higher exposure levels.

   Palavras-chave:   Aircraft noise    Aircraft noise    Cardiovascular disease    Hospitalizations    Health   
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