Newspaper article International Herald Tribune

Working out and Its Effect on the Brain ; Scientists Are Trying to Grasp How Exercise Improves Memory

Newspaper article International Herald Tribune

Working out and Its Effect on the Brain ; Scientists Are Trying to Grasp How Exercise Improves Memory

Article excerpt

Scientists are trying to understand how exercise improves memory.

Two new experiments, one involving people and the other animals, suggest that regular exercise can substantially improve memory, though different types of exercise seem to affect the brain quite differently. The news may offer consolation to the growing numbers of people who are entering age groups most at risk for cognitive decline.

Scientists at the Salk Institute for Biological Studies in La Jolla, California, discovered in the 1990s that exercise bulks up the brain. In groundbreaking experiments, they showed that mice given access to running wheels produced far more cells in an area of the brain controlling memory creation than animals that did not run. The exercised animals then performed better on memory tests than their sedentary labmates.

Since then, scientists have been working to understand precisely how, at a molecular level, exercise improves memory, as well as whether all types of exercise, including weight training, are beneficial.

The new studies provide some additional and inspiring clarity on those issues, as well as, incidentally, on how you can get lab rats to weight train.

For the human study, published in The Journal of Aging Research, scientists at the University of British Columbia recruited dozens of women aged 70 to 80 who had been found to have mild cognitive impairment, a condition that makes a person's memory and thinking more muddled than would be expected at a given age.

Mild cognitive impairment is also a recognized risk factor for increasing dementia. Seniors with the condition develop Alzheimer's disease at much higher rates than those of the same age with sharper memories.

Earlier, the same group of researchers had found that after weight training, older women with mild cognitive impairment improved their associative memory, or the ability to recall things in context -- a stranger's name and how you were introduced, for instance.

Now the scientists wanted to look at more essential types of memory, and at endurance exercise as well. So they randomly assigned their volunteers to six months of supervised exercise. Some of the women lifted weights twice a week. Others briskly walked. And some, as a control measure, skipped endurance exercise and instead stretched and toned.

At the start and end of the six months, the women completed a battery of tests designed to study their verbal and spatial memory. Verbal memory is, among other things, your ability to remember words, and spatial memory is your remembrance of where things once were placed in space. Both deteriorate with age, a loss that is exaggerated in people with mild cognitive impairment.

In this study, after six months, the women in the toning group scored worse on the memory tests than they had at the start of the study. Their cognitive impairment had grown.

But the women who had exercised, either by walking or weight training, performed better on almost all of the cognitive tests after six months than they had before. …

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