Light Physical Activity Slows Brain Aging
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In recent years, with the enthusiastic adoption of accelerometers by the designers of epidemiological studies, it has become clear that even quite modest levels of physical activity correlate strongly with improved health and a slower pace of age-related degeneration. In most human data there is no way to establish which of these is cause and which of these is consequence, but animal studies are quite definitive on the point that exercise produces improvements in health, even if it doesn’t appear to extend life span. Physical activity, like all interventions, has a dose-response curve, and there is a sizable difference between being sedentary and being even modestly active. It is still a better idea to be more than just modestly active, of course; research suggests that the recommended levels of exercise, 150 minutes per week, may well be too low.

enthusiastic adoption of accelerometersepidemiologicaleven quite modest levels of physical activityexercise produces improvements in healthhas a dose-response curvea sizable differencemay well be too low

Considerable evidence suggests that engaging in regular physical activity (PA) may prevent cognitive decline and dementia. Active individuals have lower metabolic and vascular risk factors, and these risk factors may explain these individuals’ propensity for healthy brain aging. Even

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