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Just as exercise strengthens the heart and lungs, bones and muscles, it may also power up the brain. A succession of scientific studies of animal simplies that physical activity has a
positive effect on mental functioning.
"It's clear that the brain benefits from
exercise ,"says brain scientist William Greenough of the University of Illinois at Urbana-Champaign. His studies with rats have demonstrated two
primary effects of activity: vigorous physical
exercise provides the brain with more fuel, and skill-based exercise increases the formation of
connections in the brain, which, according to the proposals of some scientists, may make the brain better able to process information.
In one experiment, laboratory rats were separated into three groups. One group was
exercised by running inside an automatic wheel, a second group improved their skills in a
complicated obstacle course, and a third group was inactive.
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