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Exercise: a potential contributing factor to the relationship between folate and dementia.
Laura E Middleton1, Susan A Kirkland, Colleen J Maxwell
1Division of Geriatric Medicine, Dalhousie University, Halifax, Canada.
Journal of the American Geriatrics Society
|July 5, 2007
Summary
Exercise significantly confounds the link between folate levels and dementia risk. Physical activity appears to explain much of the association between folate and Alzheimer's disease (AD) and all-cause dementia.
Area of Science:
- Neuroscience
- Public Health
- Nutritional Science
Background:
- Folate is crucial for brain health, and low levels are linked to cognitive decline.
- The role of lifestyle factors, such as exercise, in modifying these associations is not fully understood.
Purpose of the Study:
- To determine if exercise confounds the relationship between folate levels and cerebrovascular events, all-cause dementia, and Alzheimer's disease.
Main Methods:
- A prospective cohort study involving 466 participants from the Canadian Study of Health and Aging.
- Logistic regression analysis was used to examine associations between folate and outcomes, with and without adjustment for exercise and other confounders.
Main Results:
- Initially, higher folate levels were associated with increased risk of Alzheimer's disease and cerebrovascular events.
- After adjusting for exercise, these associations were no longer significant, with a 25-29% reduction in effect size.
- Exercise was a significant confounder for dementia and Alzheimer's disease, and inversely associated with both outcomes.
Conclusions:
- Exercise significantly confounds the association between folate and incident dementia, including Alzheimer's disease.
- Physical activity may mediate the protective effects previously attributed solely to folate in cognitive health.
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