CHICAGO, April 19 (UPI) -- U.S. researchers say that it's never too late -- even those age 80 and older -- to reduce the risk of Alzheimer's disease by exercising.
Study author Dr. Aron S. Buchman of Rush University Medical Center in Chicago said the study involved 716 people with an average age of 82 wore an actigraph -- a device that monitors activity -- on their non-dominant wrist continuously for 10 days.
All exercise and non-exercise was recorded. Test subjects were given annual tests during the four-year study that measured memory and thinking abilities. During the study, 71 people developed Alzheimer's disease, Buchman said.
The study published in the journal Neurology found that people in the bottom 10 percent of daily physical activity were more than twice as likely to develop Alzheimer's disease as people in the top 10 percent of daily activity.
The study also showed that those people in the bottom 10 percent of intensity of physical activity were almost three times as likely to develop Alzheimer's disease as people in the top 10 percent of intensity of physical activity.
"The study showed that not only exercise but also activities such as cooking, washing the dishes and cleaning are associated with a reduced risk of Alzheimer's disease," Buchman said in a statement.
"These results provide support for efforts to encourage physical activity in even very old people who might not be able to participate in formal exercise but can still benefit from a more active lifestyle."
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