by Daniel Fink, MD, Chair, The Quiet Coalition
Can noise exposure influence late-life cognition and the risk of developing dementia? That the answer might be “Yes” is suggested by a study in the latest issue of the medical journal Alzheimer’s & Dementia, the journal of the Alzheimer’s Association. I have read the article, although only the abstract is available at the link.
Researchers analyzed data collected from the Chicago Health and Aging Project, looking at 5,227 participants in the study. Noise exposure levels were estimated using accepted modeling techniques, and cognitive performance was measured using standardized tests. The populations in the four quartiles of noise exposure were largely similar in terms of ethnicity, socioeconomic status, smoking, alcohol consumption, physical activity, and body mass index.
Noise exposure level was correlated with mild cognitive impairment and Alzheimer’s disease. An increment of 10 A-weighed decibels* in noise corresponded to 36% higher odds of mild cognitive impairment and 29% higher odds of a diagnosis of Alzheimer’s disease.
It is important to note that this is among the first studies of community noise and cognitive decline, the first such study done in the United States, and perhaps most importantly, that correlation does not mean causation.
But as the authors note, there are animal studies showing brain changes with noise exposure, and as I have noted many times, there is no evidence that unwanted noise exposure has any beneficial effects on humans or animals.
*A-weighting adjusts the frequencies in sound to match those heard in human speech.
Dr. Daniel Fink is a leading noise activist based in the Los Angeles area. He is the founding chair of The Quiet Coalition, an organization of science, health, and legal professionals concerned about the impacts of noise on health, environment, learning, productivity, and quality of life in America. Dr Fink also is the interim chair of Quiet Communities’ Health Advisory Council, and he served on the board of the American Tinnitus Association from 2015-2018.