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Physical activity and risk of neurodegenerative disease: a systematic review of prospective evidence

Published online by Cambridge University Press:  23 June 2008

M. Hamer*
Affiliation:
Psychobiology Group, Department of Epidemiology and Public Health, University College London, UK
Y. Chida
Affiliation:
Psychobiology Group, Department of Epidemiology and Public Health, University College London, UK
*
*Address for correspondence: M. Hamer, Ph.D., Department of Epidemiology and Public Health, University College London, 1–19 Torrington Place, London WC1E 6BT, UK. (Email: m.hamer@ucl.ac.uk)

Abstract

Background

The association between physical activity and risk of neurodegenerative diseases is not well established. We therefore aimed to quantify this association using meta-analytical techniques.

Method

We searched Medline, the Cochrane Database of Systematic Reviews and Web of Science databases from 1990 to 2007 for prospective epidemiological studies of physical activity and incident dementia, Alzheimer's and Parkinson's disease. We excluded studies of physical activity and cognitive decline without diagnosis of a neurodegenerative disease. Information on study design, participant characteristics, measurement of exposure and outcome variables, adjustment for potential confounding, and estimates of associations was abstracted independently by the two investigators.

Results

We included 16 prospective studies in the overall analysis, which incorporated 163797 non-demented participants at baseline with 3219 cases at follow-up. We calculated pooled relative risk (RR) using a random effects model. The RR of dementia in the highest physical activity category compared with the lowest was 0.72 [95% confidence interval (CI) 0.60–0.86, p<0.001], for Alzheimer's, 0.55 (95% CI 0.36–0.84, p=0.006), and for Parkinson's 0.82 (95% CI 0.57–1.18, p=0.28).

Conclusions

Our results suggest that physical activity is inversely associated with risk of dementia. Future studies should examine the optimal dose of physical activity to induce protection, which presently remains unclear.

Type
Review Article
Copyright
Copyright © 2008 Cambridge University Press

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