Exercise Helps More Than You Think

Everyone knows that exercise is crucial for physical health. The benefits that can accrue after only 30 minutes, 3 times a week are so large that there is no excuse not to do something - anything. Except, of course, for my favorite excuse of laziness. In this New York Times article It seems that the evidence is mounting that exercise contributes directly to beneficial physical changes in our brains.

This theory emerged from those mouse studies at the Salk Institute. After conducting maze tests, the neuroscientist Fred H. Gage and his colleagues examined brain samples from the mice. Conventional wisdom had long held that animal (and human) brains weren’t malleable: after a brief window early in life, the brain could no longer grow or renew itself. The supply of neurons — the brain cells that enable us to think — was believed to be fixed almost from birth. As the cells died through aging, mental function declined. The damage couldn’t be staved off or repaired.

All of the mice showed this vivid proof of what’s known as “neurogenesis,” or the creation of new neurons. But the brains of the athletic mice in particular showed many more. These mice, the ones that scampered on running wheels, were producing two to three times as many new neurons as the mice that didn’t exercise.

Gage’s discovery hit the world of neurological research like a thunderclap. Since then, scientists have been finding more evidence that the human brain is not only capable of renewing itself but that exercise speeds the process.

“We’ve always known that our brains control our behavior,” Gage says, “but not that our behavior could control and change the structure of our brains.”

It's interesting to read the whole article.