Older people can beef up their brains as well. Cornell University studied a group of seniors ranging in age from seventy to seventy-nine. Their study showed a short-term memory increase of up to 40 percent after exercising just three hours a week. The exercise does not have to be very difficult, but it does have to increase the heart rate. Also, just like the motion for infants, exercise for older people should involve some complexity. Learning some new skills or motions helps to open up memory paths in the brain that may not have been used for a long time.
For most people, any type of physical activity that increases the heart rate is helpful. The main goal is to increase the brains flow of blood. And your brain can benefit from as little as two to three hours of exercise a week.
41 Research by Dr. Cameron seems to suggest that exercise can
A generate new blood vessels.
B change the way a person thinks.
C promote brain development.
D divert ones attention.
42 Margaret Barnes thinks that a lack of movement in infancy can
A lead to learning troubles later.
B cause physical disabilities later.
C stimulate the five senses.
D bring about changes in the brain.
43 The expression beef up in paragraph 3 means
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