Mental, Physical Exercises Produce Distinct Brain Benefits

Posted on July 19, 2016

The study, published in Frontiers in Human Neuroscience, found that healthy adults who participated in cognitive training demonstrated positive changes in executive brain function as well as a 7.9 percent increase in global brain flow compared to study counterparts who participated in an aerobic exercise program.

The aerobic exercise group showed increases in immediate and delayed memory performance that were not seen in the cognitive training group. The randomized trial is the first to compare cerebral blood flow and cerebrovascular reactivity data obtained via MRI.

“Many adults without dementia experience slow, continuous and significant age-related changes in the brain, specifically in the areas of memory and executive function, such as planning and problem-solving,” said Dr. Sandra Bond Chapman, study lead author, founder and chief director of the Center for BrainHealth, and Dee Wyly Distinguished University Professor.

“We can lose 1-2 percent in global brain blood flow every decade, starting in our 20s. To see almost an 8 percent increase in brain blood flow in the cognitive training group may be seen as regaining decades of brain health since blood flow is linked to neural health.”

For the study, 36 sedentary adults ages 56-75 years were randomized into either a cognitive training or a physical training group. Each group took part in training three hours per week over 12 weeks. Neurocognitive, physiological, and MRI data were taken before, during and after training.

The cognitive group received Strategic Memory Advanced Reasoning Training (SMART), a manualized brain training developed at the Center for BrainHealth. The strategy-based training focuses on three executive functions: strategic attention (prioritizing brain resources); integrative reasoning (synthesizing information at a deeper level); and innovation (encouraging fluid thinking, diverse perspective-taking, and problem solving).

The physical training group completed three, 60-minute sessions per week that included five minutes of warmup and cool down with 50 minutes of either walking on a treadmill or cycling on a stationary bike while maintaining 50-75 percent of maximum heart rate.

“We believe the reasoning training triggered neural plasticity by engaging the brain networks involved in staying focused on a goal, such as writing a brief business proposal, while continuously adapting to new information, such as feedback from a collaborator,” Chapman said.

The aerobic exercise group did not show significant global blood flow gains, however the exercisers with improved memory performance showed higher cerebral blood flow in the bilateral hippocampi, an area underlying memory function and particularly vulnerable to aging and dementia.

“Our research has shown that all brain training protocols do not return equal benefits. When targeting the brain functions that give us a mental edge in daily life, strategy-based programs prevail,” Chapman said. “This study highlights the potential to accelerate brain health in healthy adults by adopting lifestyle habits that exercise the mind and body. Future trials are needed to further develop and test neuroprotective programs that unite physical and cognitive training protocols for the highest health returns starting early and continuing into late life.”


Category(s):Dementia

Source material from The University of Texas at Dallas


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