Road Traffic Noise Linked to Increased Risk of Parkinson’s Disease
A recent large-scale study has found that prolonged exposure to road traffic noise may elevate the risk of developing Parkinson’s disease. This disorder, which affects movement and balance, arises from progressive brain damage over time.
Previous research has identified possible biological pathways that connect noise exposure to Parkinson’s disease, often related to stress responses and disrupted sleep. In this study, researchers evaluated noise levels from both the most and least exposed sides of participants’ homes to determine the differences in noise exposure.
The findings indicate that while the overall impact is modest, it remains consistent. Specifically, for every increase of 11.5 decibels in noise level at the most exposed facade of a home, the risk of developing Parkinson’s disease rose by 3% during the study period.
Interestingly, having a quieter area in the home may help lessen the connection between traffic noise and the heightened risk of Parkinson’s disease.
This comprehensive study, published in Jama Neurology, involved 3.1 million Danish participants aged 40 and older, tracked over 18 years using national health data. It stands as the largest exploration of the relationship between road traffic noise and Parkinson’s disease to date.
Earlier studies had linked neurological disorders, including Parkinson’s disease, with environmental toxins. Currently, factors such as air pollution, microplastics, and pesticides have taken center stage in preventative efforts.
What sets this study apart is its focus on noise pollution. Chronic exposure to noise levels surpassing World Health Organization recommendations affects nearly one-third of the European population. Thomas Münzel, one of the study’s authors, remarked that environmental noise is a relatively new consideration in the discussion of Parkinson’s disease risk factors.
Münzel believes these findings should elevate noise pollution from a speculative to a credible risk factor for Parkinson’s disease, calling for further investigation into the matter.
While researchers accounted for air pollution, they noted gaps in lifestyle information. Still, they argue that lifestyle factors likely didn’t alter the observed relationship, as they noticed consistent links to Parkinson’s disease across different education and income levels.
Chronic noise pollution is thought to disrupt sleep and lead to increased cortisol levels, a stress hormone. Anna Hansell, a professor of environmental epidemiology at the University of Leicester, who wasn’t part of the research, suggested that noise may be more of a general stressor rather than a specific risk for Parkinson’s disease, indicating that the study’s design doesn’t necessarily confirm direct causation.
Dr. Peter Chan, a senior researcher of environmental epidemiology not involved in the study, noted the interesting dimension revealed by the noise level differences, emphasizing that noise exposure is not uniform in homes. However, he cited the findings as somewhat expected.
He added that various potential risk factors for Parkinson’s disease are also linked to low socioeconomic status, making it challenging to separate the impact of noise from other contributing factors.
John Stewart, chair of the UK Noise Association and not affiliated with the study, stated that this research adds to a growing body of evidence linking traffic noise to physical and mental health issues. He pointed out that the correlation was strongest in areas with higher noise levels, particularly near major roads.
Stewart concluded that this suggests a need for governments and local authorities to prioritize reducing noise from main roads.
