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Living in greener neighbourhoods ‘slows down ageing process – particularly for women’

Researchers found a link between neighbourhood green space and mental capacity after following 6,500 people in Britain for 10 years

Joe Mellor by Joe Mellor
2018-07-11 23:10
in Environment, News
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Living in areas with lots of parks and green spaces slows down the ageing process – particularly for women, according to a new study.

Researchers who followed 6,500 people in Britain for a decade found that living in greener neighbourhoods is associated with slower cognitive decline in people over the age of 45.

Contact with green space is known to have beneficial effects for mental health.

But the new study suggests that it may also play a positive role slowing cognitive decline in elderly.

The findings, published in the journal Environmental Health Perspectives, show in particular that the loss in cognitive functions expected as part of the ageing process is slightly slower in people who live in greener areas.

The research team performed a 10 years follow-up of 6,500 people aged 45 to 68 in the UK.

At three different timepoints during the course of the study, the participants completed a series of cognitive tests that assessed their verbal and mathematical reasoning, verbal fluency and short-term memory, as well as the decline in these functions.

Neighbourhood green space for each participant was estimated using satellite images.

Study first author Carmen de Keijzer said: “There is evidence that the risk for dementia and cognitive decline can be affected by exposure to urban-related environmental hazards – such as air pollution and noise – and lifestyle, such as stress and sedentary behaviour.

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“In contrast, living near green spaces has been proposed to increase physical activity and social support, reduce stress, and mitigate exposure to air pollution and noise.

“Recent evidence has shown cognitive benefits of green space exposure in children, but studies on the possible relations of exposure to green spaces and cognitive decline in older adults are still very scarce and often have inconsistent results.”

Ms de Keijzer a PhD student with the Barcelona Institute for Global Health (ISGlobal), added: “Our data show that the decline in the cognitive score after the 10-years follow up was 4.6 per cent smaller in participants living in greener neighbourhoods.

“Interestingly enough, the observed associations were stronger among women, which makes us think that these relations might be modified by gender.”

Assistant Research Professor Payam Dadvand, ISGlobal researcher and last author of the study, said: “The proportion of people over 60 years old in the world is expected to nearly double between 2015 and 2050 and the number of dementia cases has been predicted to grow at a similar pace worldwide.

“Although the differences in cognitive decline observed in our study are modest at individual level, they become much more significant if we consider these findings at population level.”

Dr Dadvand added: “If confirmed by future studies, our results may provide an evidence base for implementing targeted interventions aimed at decelerating cognitive decline in older adults residing in urban areas and hence improving their quality of life.”

 

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