Boston [Massachusetts], May 2 : According to a recent study, those who were exposed to even moderate levels of aircraft noise had a higher risk of not getting the minimum amount of sleep recommended each night. This risk was also higher for those who lived in the Western United States, close to a significant cargo airport, close to a sizable body of water, and for those without hearing loss.
The Boston University School of Public Health (BUSPH) and Oregon State University have conducted a new analysis, which adds to a growing body of research on the harmful health effects of environmental noise, and found that exposure to even moderate levels of aeroplane noise may disturb sleep. Major airline officials predict another record summer air travel season.
Findings of the study that was published in the journal Environmental Health Perspectives, those who were exposed to aeroplane noise at levels as low as 45 dB had a higher likelihood of sleeping less than 7 hours every night. For reference, a whisper is 30 decibels (dB), a library is 40 dB, and an average home discussion is 50 dB.
Sleep is essential to overall health and well-being, including daily physical and mental functioning, and a lack of adequate sleep can lead to increased risks of cardiovascular disease, depression, diabetes, cancer, and numerous other health conditions. Health experts state that most adults need seven to nine hours of sleep each night for healthy functioning.
This study is the first large-scale analysis of aircraft noise and sleep duration that accounts for the disruptive effects of multiple environmental exposures in communities, such as greenery and light at night (LAN).
Despite how common exposure to noise from aircraft is for many people, little is known about the health effects of aircraft noise, particularly in the U.S., according to study lead author Matthew Bozigar, assistant professor of epidemiology at OSU, and study senior author Junenette Peters, associate professor of environmental health at BUSPH.
"This study helps us understand the potential health pathways by which aircraft noise may act, such as through disrupted sleep," Peters says.
For the study, Dr. Peters, Dr. Bozigar and colleagues from BUSPH, Brigham and Women's Hospital, Harvard Medical School, and Harvard T.H. Chan School of Public Health examined airplane noise exposure and self-reported sleep disturbance among more than 35,000 participants living around 90 of the major US airports. The participants were selected from the Nurses' Health Study (NHS), an ongoing, prospective study of US female nurses who have completed biennial questionnaires since 1976.
The team examined aircraft noise levels every five years from 1995 to 2015, focusing on two measurements: a nighttime estimate (Lnight) that captures airplane noise occurring when people sleep, and a day-night estimate (DNL) that captures the average noise level over a 24-hour period and applies a 10 dB adjustment for aircraft noise occurring at night, when background noise is low. The DNL is also the primary metric that the FAA uses for aircraft noise policies, and the threshold for significant noise impacts is above DNL 65 dB. The team linked these measures at multiple thresholds with the nurses' geocoded residential addresses.
After accounting for a range of factors, including demographics, health behaviors, comorbidities, and environmental exposures such as greenery and light at night (LAN), the results showed that the odds of sleeping less than seven hours rose as airplane noise exposure increased.
Short sleep duration was also more likely among nurses who lived on the West Coast, near a major cargo airport or a large body of water, as well as among nurses who reported no hearing loss.
"We found surprisingly strong relationships for particular subgroups that we are still trying to understand," Bozigar says. "For instance, there was a relatively strong signal between aircraft noise and both dimensions of disrupted sleep, short sleep duration and poor sleep quality, near major cargo airports. There is likely more going on to this story, as cargo operations tend to use larger, older, heavily laden, and therefore noisier aircraft that often fly through the nighttime hours. And the quantity of cargo shipped by air has been steadily increasing over the last couple of decades, possibly linked to more e-commerce. If the trends continue, it could mean more aircraft noise impacts to more groups of people."
While the results suggested a clear link between airplane noise and sleep duration, the researchers observed no consistent association between aircraft noise and quality of sleep.
"Though we cannot recommend policy changes from the results from a single study, our study around 90 U.S. airports did reveal a connection between aircraft noise and getting less than the recommended amount of sleep," says Dr. Bozigar. "Current gaps in knowledge could be filled in the future by including additional demographic groupssuch as children, men, minority groupsand more detailed metrics of aircraft noise rather than a nightly or 24-hour average in studies. There are also more detailed ways of measuring sleep than from self-reports, such as wearable activity monitors, like a Fitbit, that researchers are incorporating more frequently in studies. And we still need to design studies that include other common sources of transportation noise, such as from cars and trains, to determine the impact of each type on health."
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