Simple physical activities such as gardening, dancing, and walking were found to improve brain structure and reduce Alzheimer’s risk.
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‘Engaging in regular physical activities improve brain volumes in the frontal, temporal, and parietal lobes, reducing the risk of Alzheimer’s by 50 percent.
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The researchers studied a long-term cohort of patients in the 30-year Cardiovascular Health Study, 876 in all, across four research sites in the United States. These participants had longitudinal memory follow-up, which also included standard questionnaires about their physical activity habits. 
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The results of the analysis showed that increasing physical activity was correlated with larger brain volumes in the frontal, temporal, and parietal lobes including the hippocampus.
Individuals experiencing this brain benefit from increasing their physical activity experienced a 50 percent reduction in their risk of Alzheimer's dementia. Of the roughly 25 percent of the sample who had mild cognitive impairment associated with Alzheimer's, increasing physical activity also benefited their brain volumes.
Lead author Dr. Cyrus A. Raji said that this is the first study to correlate the predictive benefit of different kinds of physical activity with the reduction of Alzheimer's risk through specific relationships with better brain volume in such a large sample.
George Perry, Editor in Chief of Journal of Alzheimer's Disease, added, "Raji et al present a landmark study that links exercise to increases in grey matter and opens the field of lifestyle intervention to objective biological measurement."
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The study appears in the Journal of Alzheimer's Disease.
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