Sport in old age can stimulate brain fitness, but effect decreases with advancing age

Physical exercise in old age can improve brain perfusion as well as certain memory skills, say neuroscientists who studied men and women aged between 60 and 77. In younger individuals regular training on a treadmill tended to improve cerebral blood flow and visual memory. However, trial participants who were older than 70 years of age tended to show no benefit of exercise.
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