Cardiovascular exercise moderate and regular, like a walk, improves memory in people over 55 years and prevents the deterioration of mental capacities linked to aging. The authors of the first study conducted on adults with good health for more than 55 years, showing the normal signs of atrophy in the hippocampus, the region of the brain that plays a key role in memory have come to this conclusion. The work has been published in the revistPNAS.Para this new research, U.S. scientists from the universities of Pittsburgh, Illinois and Rice recruited 120 people from 55 to 80 years, sedentary and no signs of dementia. The half was subjected to a program of moderate walking 40 minutes three days a week, while the other group did stretching exercises only.In tests with magnetic resonance imaging, scientists noted that, after a year, participants who had exercised walking showed an increase in their hippocampi left and right to 2.12 and 1.19% respectively. Instead, the members of the other group experienced a decrease of 1.40 and 1.43% in the same brain regions, i.e. the normal deterioration due to aging, affecting memory and increases the risk of dementia.