A new report have stated that regular 30mins exercise, done four to five times a week may prevent or slow cognitive decline in older adults who are at a high risk of developing Alzheimer.
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“This is the first randomized and controlled trial … to assess effects of exercise on brain structure, function and amyloid burden in older adults who have memory problems, thus, high risks of Alzheimer’s disease,” said lead author Rong Zhang, a neurology professor at UT Southwestern Medical Center.
The study was a small proof-of-concept trial of people ages 55 and older with mild cognitive impairment.
Subjects were randomized to 12 months of aerobic exercise or stretching and toning. Both aerobic and stretching may prevent or slow cognitive decline, according to the researchers, but aerobic exercise had more benefits on reducing hippocampal shrinkage than stretching.
The hippocampus is a region of the brain crucial for memory.
Neither type of exercise prevented amyloid clumps — a hallmark of Alzheimer’s disease — from continuing to develop in the brains of the 70 adults who participated in the study. But MRI and PET imaging showed those who did aerobic exercise had slower degeneration in the hippocampus than those who did flexibility training.
“The brains of participants with amyloid responded more to the aerobic exercise than the others,” Zhang said.
“The key positive finding is that the exercise intervention specifically reduced shrinkage of the memory center in the brain in people with the earliest symptomatic stage of Alzheimer’s disease,” said neurologist Dr. Richard Isaacson, who founded the Alzheimer’s Prevention Clinic at Weill Cornell Medicine.
“Most physicians believe in the power of exercise to support overall brain health, but fewer believe that exercise can specifically impact people with early Alzheimer’s,” Isaacson said. “This study brings us one step closer toward teasing out the effects in people with biomarker defined Alzheimer’s.”
While the study results must be replicated in much larger studies, Zhang suggested that anyone concerned about cognitive decline or Alzheimer’s consider adding exercise to their daily lives. While it’s best to start exercising early in life, he said, “it is not too late to receive the benefits of exercise even late in life when there are already amyloid clumps in the brain.”
The Alzheimer is “a progressive disease that destroys memory and other important mental functions.”