Walking, Gardening, Swimming, Dancing Can Slow Brain Aging
Older people who regularly walk, garden, swim, or dance may have bigger brains than their inactive peers, according to a preliminary study.
Researchers say the exercise may slow brain aging by four years.
The study used magnetic resonance imaging (MRI) scans to measure the brains of people with a range of activity levels, including those who were inactive to those who were very active. The scans showed less active people had smaller brain volume, according to the study’s findings.
“These results are exciting, as they suggest that people may potentially prevent brain shrinking and the effects of aging on the brain simply by becoming more active,” said study author Yian Gu, Ph.D., of Columbia University in New York and a member of the American Academy of Neurology.
“Recent studies have shown that as people age, physical activity may reduce the risk of cognitive decline and dementia. Our study used brain scans to measure the brain volumes of a diverse group of people and found that those who engaged in the top third highest level of physical activity had a brain volume the equivalent of four years younger in brain aging than people who were at the bottom third activity level.”
The study involved 1,557 people with an average age of 75. None had dementia, but 296 people had mild cognitive impairment and 28 percent had the APOE gene that is linked to a greater risk of Alzheimer’s disease, according to the researchers.
Participants were given physical exams, thinking and memory tests, and were asked about their daily tasks and other physical activities. Researchers then calculated how much time and energy each person spent on those tasks and activities.
Researchers divided people into three groups: Those who were inactive; those who were somewhat active, meaning each week they either had roughly two-and-a-half hours of low-intensity physical activity, one-and-a-half hours of moderate physical activity, or one hour of high-intensity physical activity; and those who were most active, meaning each week they either had seven hours of low-intensity physical activity, four hours of moderate physical activity, or two hours of high-intensity physical activity.
Researchers then reviewed MRI brain scans of all the participants and found that when compared to the people in the inactive group, those who were most active had larger total brain volume.
After adjusting for age, sex, education, race/ethnicity, and APOE gene status, the average brain size for those who were inactive was 871 cubic centimeters, compared to 883 cubic centimeters for those who were most active, a difference of 12 cubic centimeters, or 1.4 percent. That’s the equivalent of nearly four years of brain aging, according to the study’s findings.
The results were similar even after excluding people who had mild cognitive impairment, the researchers noted.
“Our results add to the evidence that more physical activity is linked to larger brain volume in older people,” said Gu. “It also builds on evidence that moving your body more often throughout one’s life may protect against loss of brain volume.”
A limitation of the study was that information on physical activity relied on a person’s ability to remember how often and how much time they were active, the researchers noted.
Additionally, Gu noted that due to the particular study design, this study does not prove that exercise prevents brain shrinkage. It shows an association.
The study, supported by the National Institute on Aging and the National Institutes of Health, will be presented at the American Academy of Neurology’s 72nd Annual Meeting in Toronto, Canada, April 25 to May 1, 2020.
Wood, J. (2020). Walking, Gardening, Swimming, Dancing Can Slow Brain Aging. Psych Central. Retrieved on August 3, 2020, from https://psychcentral.com/news/2020/03/08/walking-gardening-swimming-dancing-can-slow-brain-aging/154771.html