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There are good data that environmental and social factors play a major role in the risks for cardiovascular disease (CVD) and cancer, the 2 most important causes of mortality in the United States. In a study conducted by Xiao and colleagues in 2018 and published in the American Journal of Epidemiology[1], they evaluated how changes in socioeconomic deprivation in US neighborhoods affected risk for mortality among middle-aged and older adults.
The study examined 288,555 adults between the ages of 51 and 70 years who did not move from their US residence between 1990 and 2000. Researchers used census data to track neighborhood socioeconomic deprivation. Researchers' hypothesis that mortality rates would shift inversely to changes in socioeconomic deprivation was proven correct. Improvements in neighborhood deprivation in poor areas improved mortality rates by over 10%. This effect was stronger among women vs men, particularly among women with chronic illnesses; however, when relatively affluent neighborhoods developed higher rates of deprivation, mortality rates rose, and this latter effect was particularly pronounced among men.
The built environment and green space are variables that affect mortality, but there are less data on their influence on important chronic neurologic illnesses. The current study by Klompmaker and colleagues addresses this deficit.
Exposure to natural environments may lower hospitalizations for patients with neurodegenerative disorders, new research suggests.
In a large, open-cohort study, living in areas rich with greenery, parks, and waterways (blue space) was linked to fewer hospitalizations for Parkinson disease (PD), and residing near green spaces was associated with fewer hospitalizations for Alzheimer disease and related dementias (ADRD).
These results should be useful to policymakers and urban planners, lead study author Jochem O. Klompmaker, PhD, postdoctoral researcher, department of environmental health, Harvard T. H. Chan School of Public Health, Boston, Massachusetts, told Medscape Medical News.
They also provide clinicians with more evidence of the importance of being close to nature and of encouraging patients to take more walks, Klompmaker noted.
"If they live near a park, that could be a good place to be more physically active and reduce stress levels," he said.
The findings were published December 1 in JAMA Network Open.[2]
3 Natural EnvironmentsAlzheimer disease and PD are the most prevalent neurologic diseases in the United States and will likely become even more common owing to longer life expectancy, the investigators noted.
Because there are no cures for ADRD or PD, it is important to identify modifiable risk factors, they added.
Previous research has shown an association between environmental exposures and AD and PD; however, past studies focused mainly on greenery.
The current study examined associations between ADRD and PD hospital admissions and 3 natural environments: parks, blue space, and green space.
The study included about 61.7 million fee-for-service Medicare beneficiaries aged at least 65 years and living in the United States.
Researchers examined first hospital admissions with a primary or secondary discharge diagnosis of ADRD or PD. There were 7,737,609 such hospitalizations for ADRD and 1,168,940 for PD from 2000 to 2016.
The study used zip codes to determine exposures. To measure greenness, the investigators used satellite images to calculate the normalized difference vegetation index (NDVI). The NDVI ranges from −1 to 1, with larger values indicating higher levels of live vegetation, which could include trees, gardens, and agricultural crops.
For park exposure, the researchers used the US Geological Survey Protected Areas Database to determine land types likely used by the public for outdoor recreation, such as playgrounds and basketball courts. They calculated the percentage park cover for each zip code.
Blue space includes surface water, such as rivers and lakes. The researchers used satellite image data to calculate spatially weighted mean blue space values for each zip code.
Covariates included age, sex, race/ethnicity, and Medicaid eligibility as a proxy for low socioeconomic status (SES). Additional SES indicators included median household income, Klompmaker noted.
Hazard ratios for NDVI and percentage park cover were expressed per interquartile range (IQR) difference. The investigators compared HRs of blue space cover (≥ 1%) with the reference category (< 1% blue space cover).
Differences by ExposureResults showed that NDVI was associated with a decrease in ADRD hospitalizations after adjustment for potential confounders (HR 0.95 [95% CI: 0.94, 0.96] per IQR increase).
There was no evidence of an association between percentage park cover and blue space cover with ADRD hospitalization; however, all 3 exposures were associated with a decrease in PD hospitalizations after adjustments. The HRs were 0.94 (95% CI: 0.93, 0.95) for NDVI, 0.97 (95% CI: 0.97, 0.98) for percentage park cover, and 0.97 (95% CI: 0.96, 0.98) for blue space cover of at least 1%.
Zip codes with higher NDVI had lower air pollution levels, which may explain part of the effect, said Klompmaker.
"When we adjust for air pollution, we saw effects of greenness became less strong," he added.
Results by neighborhood SES differed between exposures. For example, for PD hospitalization, associations of percentage park cover were greatest in low-SES zip codes, whereas associations of NDVI were greatest for zip codes with higher SES.
When evaluating associations only in urban zip codes, researchers found that associations were similar to those of the full cohort. This was "a little surprising," as previous studies showed that associations were generally stronger in urban areas, Klompmaker noted.
It is not clear why outcomes for ADRD and PD varied, he added.
"PD and AD are different diseases, so there may be different relations between specific exposures," he said.
Further analysis showed that more exposure to natural environments could decrease hospitalizations.
"Not a Stretch"Commenting for Medscape Medical News, Michael S. Okun, MD, chair of neurology at University of Florida Health, Gainesville, Florida, and medical advisor for the Parkinson's Foundation, said the results make sense.
"Natural environments have been associated with less cardiac disease and less depression; and it would not be a stretch to consider there are less neurodegenerative disease hospitalizations when folks spend time in natural environments," said Okun, who was not involved with the research.
He noted the conflicting results from studies of natural environments as being potentially associated with neurodegenerative diseases.
"One tricky element has been controlling for air pollution in urban areas," he said.
Still, exposure to natural environments may reduce stress, restore attention, and increase activity and social interactions, all of which improve cognition, said Okun.
The study was funded by grants from the National Institute of Environmental Health Sciences, the National Institute on Aging, the National Heart, Lung, and Blood Institute, and the National Institute on Minority Health and Health Disparities. Klompmaker received a grant from the National Institutes of Health during the conduct of the study. Okun has disclosed no relevant financial relationships.