September 3, 2008 Exercise may help ward off dementia Play video

(NECN/ABC) - As the world's population ages, the hunt is on for something - anything - that might slow memory loss in old age. Scientists have tested everything from vitamins to painkillers with thus far disappointing results. But a new study suggests that simple exercise may help ward off dementia in those experiencing memory problems.

Numerous studies show that physically active people are less likely to develop dementia in old age.

But a new study from researchers in Australia finds that exercise can even SLOW DOWN memory loss in those who are already having difficulty.

Doctors followed 170 seniors with mild memory problems - half were encouraged to exercise 150 minutes per week while the other half went about their usual activities.

Most participants in the exercise program chose walking, but a few opted for weight training or aerobics.

After who exercised had improved recall and better scores on an Alzheimer's test.

While the memory benefits were modest, researchers say they are comparable to those seen with Alzheimer's drugs - and exercise has no side effects.

Also, the improvement was long-lasting. Physically active seniors had better memory scores more than a year after they stopped the exercise portion of the study.

Researchers estimate that delaying dementia by even just one year could prevent MILLIONS of cases worldwide.

ABC's Dr. Timothy Johnson has more in this Medical Minute.