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  • Green neighborhoods...

Green neighborhoods linked to lower risk of cardiovascular disease: Study

Written By : Dr. Kamal Kant Kohli Published On 2021-09-09T09:00:14+05:30  |  Updated On 9 Sept 2021 9:00 AM IST
Green neighborhoods linked to lower risk of cardiovascular disease: Study
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Tree planting and greening of neighborhoods are associated with multiple benefits and offer a relatively low-cost investment to enhance health and well-being in many circumstances.

Sophia Antipolis: People living in green neighborhoods are at a lower risk of developing cardiovascular disease (CVD), according to recent research. The findings of the study were presented at the European Society of Cardiology (ESC) Congress 2021.

"Higher levels of greenness were associated with lower rates of heart conditions and stroke over time, both when an area maintained high greenness and when greenness increased," said study author Dr. William Aitken of the University of Miami, US. "It was remarkable that these relationships appeared in just five years, a relatively short amount of time for a positive environmental impact."

Making streets and neighborhoods greener has many benefits and this study investigated whether it had any relationship with rates of heart disease. The researchers also examined whether planting more vegetation in a locality would be accompanied by reductions in heart disease over time.

The study included 243,558 US Medicare beneficiaries aged 65 and older who lived in the same area of Miami from 2011 to 2016. Medicare records were used to obtain the incidence of new cardiovascular conditions during the five-year study including heart attack, atrial fibrillation, heart failure, ischaemic heart disease, hypertension, and stroke/transient ischaemic attack.

Satellite images were used to assess the amount of visible and near-infrared (i.e. invisible) sunlight reflected from the Earth's surface. Chlorophyll from plants typically absorbs visible light and reflects near-infrared light, so measuring both indicates the amount of vegetation. The greenness of city blocks was then classified as low, medium, or high.

Participants were categorized based on whether they lived in low, medium, or high greenness blocks in 2011. The process was repeated for those same residents and the greenness of their blocks in 2016. During that period of time, Miami-Dade County Parks conducted tree planting programs so, for example, there was the possibility that someone in a low greenness block in 2011 could be living in a high greenness block in 2016.

The researchers analyzed the odds of developing any new cardiovascular disease, and the number of new cardiovascular conditions, based on block-level greenness. The analyses were adjusted for other factors that could be related to new-onset heart disease: age, sex, race/ethnicity, number of baseline cardiovascular conditions, and neighborhood characteristics including median household income and walkability.

The researchers first compared heart health among those continually living in high versus low greenness areas during the five-year study. Residents of high greenness blocks throughout the study had a 16% lower odds of developing any new cardiovascular conditions compared to those in low greenness blocks (odds ratio [OR]=0.84). Among participants who developed a cardiovascular condition during follow-up, those in high greenness areas developed 4% fewer new diseases compared with those in low greenness blocks (OR=0.96).

The researchers then compared heart health in participants whose neighborhoods became greener versus those who continued to live in areas with low vegetation. When compared to residents of low greenness areas throughout the study, those living in areas that increased their greenness from low in 2011 to high in 2016 had 15% lower odds of developing new cardiovascular conditions (OR=0.85). Among participants who developed a cardiovascular condition during follow-up, those whose neighborhood became greener developed 9% fewer new cardiovascular conditions compared to residents of localities with continually low levels of greenness throughout the study (OR=0.91).

Dr. Aitken said: "We suspect that multiple factors may account for these observations. For instance, people living in greener areas may do more outdoor exercise and might feel less stressed due to being surrounded by nature. In addition, vegetation could provide some protection from air and/or noise pollution. This is an area for further exploration."

He added: "Tree planting and greening of neighborhoods is associated with multiple benefits and offers a relatively low-cost investment to enhance health and well-being in many circumstances. For the cost of one emergency room visit for a heart attack, trees could be planted in a neighborhood with 100 residents and potentially prevent ten heart diseases in this group."

Reference:

Abstract title: Longitudinal impacts of greenness on cardiovascular disease conditions.

European Society of CardiologyESC Congress 2021cardiovascular diseasegreen neighborhoods
Source : European Society of Cardiology
Dr. Kamal Kant Kohli
Dr. Kamal Kant Kohli

Dr Kamal Kant Kohli-MBBS, DTCD- a chest specialist with more than 30 years of practice and a flair for writing clinical articles, Dr Kamal Kant Kohli joined Medical Dialogues as a Chief Editor of Medical News. Besides writing articles, as an editor, he proofreads and verifies all the medical content published on Medical Dialogues including those coming from journals, studies,medical conferences,guidelines etc. Email: drkohli@medicaldialogues.in. Contact no. 011-43720751

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