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Exercising at Midlife May Stave Off Dementia Down the Road
Date:2/4/2013

By Denise Mann
HealthDay Reporter

MONDAY, Feb. 4 (HealthDay News) -- Being in good shape during your 40s may help lower your risk for Alzheimer's disease and other types of dementia in your senior years. And the better shape you're in, the lower this risk may be, a large new study suggests.

Nearly 20,000 healthy people took a treadmill test to measure their fitness levels when they were middle-aged. Researchers then reviewed Medicare claims data to see who was diagnosed with any type of dementia in their later years. Follow-up lasted an average of 24 years, with patients assessed for signs of dementia at ages 70, 75, 80 and 85.

Those participants who were deemed physically fit via the treadmill stress test were less likely to develop dementia after age 65 than were their counterparts who were less fit, the study showed.

The findings appear in the Feb. 5 Annals of Internal Medicine.

Researchers can't say for certain that it's the exercise or fitness level that protects brain health based on the results of this study. They also can't say how much exercise is needed to reap any benefits.

That said, "this paper tells us that the more fit one is at midlife, the less likely they are to develop dementia," said study author Dr. Laura DeFina, medical director of research at the Cooper Institute, in Dallas.

Most major medical groups recommend 150 minutes of moderate activity or 75 minutes of vigorous exercise per week, or some combination thereof, she said. "The needle has not been pushed far enough on physical activity," DeFina said. "We are not a moving nation at this point, and this is another bit of evidence to encourage people to exercise."

Exactly how exercise may preserve brain function is not fully understood but, "we know that anything we can do to keep our heart healthy is critical to keeping our brain healthy," she said.

Still, DeFina said, it's a good idea to talk to y
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