Aerobics may be a smart workout for your brain at any age


aerobic exercise
Credit: CC0 Public Domain

It’s never too late to lace up some sneakers and work up a sweat for brain health, according to a study published in the May 13, 2020, online issue of Neurology, the medical journal of the American Academy of Neurology. The study suggests older adults, even couch potatoes, may perform better on certain thinking and memory tests after just six months of aerobic exercise.

“As we all find out eventually, we lose a bit mentally and physically as we age. But even if you start an later in life, the benefit to your may be immense,” said study author Marc J. Poulin, Ph.D., D.Phil., from the Cumming School of Medicine at the University of Calgary in Alberta, Canada. “Sure, aerobic gets moving through your body. As our study found, it may also get blood moving to your brain, particularly in areas responsible for and executive functions. Our finding may be important, especially for at risk for Alzheimer’s and other dementias and brain disease.”

The study involved 206 adults who prior to starting the six-month exercise intervention worked out no more than four days per week at a moderate intensity for 30 minutes or less, or no more than two days per week a high intensity for 20 minutes or less per day. They had an average age of 66 and no history of heart or memory problems. Participants were given thinking and at the start of the study, as well as an ultrasound to measure blood flow in the brain. Physical testing was repeated at three months, and thinking and physical testing repeated at the end of the six months.

Participants were enrolled in a supervised program held three days a week. As they progressed through the program, they increased their workout from an average of 20 minutes a day to an average of at least 40 minutes. In addition, people were asked to work out on their own once a week.

Researchers found that after six months of exercise, participants improved by 5.7% on tests of executive function, which includes mental flexibility and self-correction. Verbal fluency, which tests how quickly you can retrieve information, increased by 2.4%.

“This change in verbal fluency is what you’d expect to see in someone five years younger,” Poulin said.

Before and after six months of aerobic activity, the participants’ average peak blood flow to the brain was measured using ultrasound. Blood flow rose from an average of 51.3 centimeters per second (cm/sec) to an average of 52.7 cm/sec, a 2.8% increase. The increase in with exercise was associated with a number of modest but significant improvements in aspects of thinking that usually decline as we age, Poulin said.

“Our study showed that six months’ worth of vigorous exercise may pump blood to regions of the brain that specifically improve your verbal skills as well as memory and mental sharpness,” said Poulin. “At a time when these results would be expected to be decreasing due to normal aging, to have these types of increases is exciting.”

A limitation of the study was that the people doing the exercise were not compared to a similar group of people who were not exercising, so the results may have been due to other factors, although the researchers tried to control for this by testing participants twice over six months before the start of the program. In addition, some of the exercise was unsupervised, so the amount reported may be unreliable.


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Aerobics may be a smart workout for your brain at any age (2020, May 13)
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