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Published in: Social Psychiatry and Psychiatric Epidemiology 9/2021

01-09-2021 | Magnetic Resonance Imaging | Original Paper

Associations between neighborhood greenspace and brain imaging measures in non-demented older adults: the Cardiovascular Health Study

Authors: Lilah M. Besser, Gina S. Lovasi, Yvonne L. Michael, Parveen Garg, Jana A. Hirsch, David Siscovick, Phil Hurvitz, Mary L. Biggs, James E. Galvin, Traci M. Bartz, W. T. Longstreth

Published in: Social Psychiatry and Psychiatric Epidemiology | Issue 9/2021

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Abstract

Purpose

Greater neighborhood greenspace has been associated with brain health, including better cognition and lower odds of Alzheimer’s disease in older adults. We investigated associations between neighborhood greenspace and brain-based magnetic resonance imaging (MRI) measures and potential effect modification by sex or apolipoprotein E genotype (APOE), a risk factor for Alzheimer’s disease.

Methods

We obtained a sample of non-demented participants 65 years or older (n = 1125) from the longitudinal, population-based Cardiovascular Health Study (CHS). Greenspace data were derived from the National Land Cover Dataset. Adjusted multivariable linear regression estimated associations between neighborhood greenspace five years prior to the MRI and left and right hippocampal volume and 10-point grades of ventricular size and burden of white matter hyperintensity. Interaction terms tested effect modification by APOE genotype and sex. CHS data (1989–1999) were obtained/analyzed in 2020.

Results

Participants were on average 79 years old [standard deviation (SD) = 4], 58% were female, and 11% were non-white race. Mean neighborhood greenspace was 38% (SD = 28%). Greater proportion of greenspace in the neighborhood five years before MRI was borderline associated with lower ventricle grade (estimate: − 0.30; 95% confidence interval: − 0.61, 0.00). We observed no associations between greenspace and the other MRI outcome measures and no evidence of effect modification by APOE genotype and sex.

Conclusion

This study suggests a possible association between greater greenspace and less ventricular enlargement, a measure reflecting global brain atrophy. If confirmed in other longitudinal cohort studies, interventions and policies to improve community greenspaces may help to maintain brain health in older age.
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Metadata
Title
Associations between neighborhood greenspace and brain imaging measures in non-demented older adults: the Cardiovascular Health Study
Authors
Lilah M. Besser
Gina S. Lovasi
Yvonne L. Michael
Parveen Garg
Jana A. Hirsch
David Siscovick
Phil Hurvitz
Mary L. Biggs
James E. Galvin
Traci M. Bartz
W. T. Longstreth
Publication date
01-09-2021
Publisher
Springer Berlin Heidelberg
Published in
Social Psychiatry and Psychiatric Epidemiology / Issue 9/2021
Print ISSN: 0933-7954
Electronic ISSN: 1433-9285
DOI
https://doi.org/10.1007/s00127-020-02000-w

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