Do you know Brain connectivity, memory improves in older adults after walking? Study finds

Washington [US], June 30 : Walking enhances connections within and between three different brain networks, including one linked to Alzheimer's disease, according to a recent study from the University of Maryland School of Public Health, adding to the growing body of research showing that exercise is beneficial for brain health.

The study, which was just released this month in the Journal for Alzheimer's Disease Reports, looked at the brains and story recall skills of older adults with normal brain function and those who had been diagnosed with mild cognitive impairment, which is a risk factor for Alzheimer's and a slight decline in mental abilities like memory, reasoning, and judgement.

"Historically, the brain networks we studied in this research show deterioration over time in people with mild cognitive impairment and Alzheimer's disease," said J. Carson Smith, a kinesiology professor with the School of Public Health and principal investigator of the study, adding, "They become disconnected, and as a result, people lose their ability to think clearly and remember things. We're demonstrating that exercise training strengthens these connections."

The study builds on Smith's previous research, which showed how walking may decrease cerebral blood flow and improve brain function in older adults with mild cognitive impairment.

Thirty-three participants, who ranged between 71 and 85 years old, walked while supervised on a treadmill four days a week for 12 weeks. Before and after this exercise regimen, researchers asked participants to read a short story and then repeat it out loud with as many details as possible.

Participants also underwent functional magnetic resonance imaging (fMRI) so researchers could measure changes in communication within and between the three brain networks that control cognitive function:

Default mode network Activates when a person isn't doing a specific task (think daydreaming about the grocery list) and is connected to the hippocampus one of the first brain regions affected by Alzheimer's disease. It's also where Alzheimer's and amyloid plaques, a prime suspect for Alzheimer's disease found around nerve cells, show up in tests.

Frontoparietal network

It regulates decisions made when a person is completing a task. It also involves memory.

Salience network

It monitors the external world and stimuli and then decides what deserves attention. It also facilitates switching between networks to optimize performance.

After 12 weeks of exercise, researchers repeated the tests and saw significant improvements in participants' story recall abilities.

"The brain activity was stronger and more synchronized, demonstrating exercise actually can induce the brain's ability to change and adapt," Smith said, adding, "These results provide even more hope that exercise may be useful as a way to prevent or help stabilize people with mild cognitive impairment and maybe, over the long term, delay their conversion to Alzheimer's dementia."

Researchers also observed stronger activity within the default mode network, within the salience network and in the connections between the three networks.