En español | As a certified nurse practitioner working at a busy university student health center in Albuquerque, N.M., Barbara Krause had been intrigued by the promise of mindfulness meditation—a technique taught at more than 200 hospitals around the country as a way to combat stress and gain some relief from a busy mind. Studies have long found that the practice lowers blood pressure, diminishes the risk of stroke and reduces stress.
What Krause didn’t realize is that the science on meditation now says the ancient practice can actually cause physical changes in the brain that protect us as we age.
Scientists have been studying these changes in people who practice the kind of basic meditation that focuses on sensory awareness and breathing.
This type of meditation is common in Hinduism and Buddhism and is called various names — such as mindfulness or Zen — depending on which tradition you’re talking about.
Krause, 57, enrolled in an eight-week course of mindfulness-based stress reduction to learn how to tune out the mind’s internal chatter and truly notice what is going on in and around her. Through the class, she learned to connect with her breathing and become aware of physical sensations as a way of anchoring her awareness in the present.
Today, she tries to sit and breathe for 20 minutes at a time four or five times a week.
“It was a wonderful experience,” Krause says. “I’m very much a novice, but I’m enthused.”
Helps stress, chronic pain and high blood pressure
Meanwhile, neuroscientists are uncovering the changes in the brain that accompany these benefits. Their research relies on a concept called neuroplasticity—the idea that what we focus our attention on actually reshapes the brain in crucial ways.
The stress-busting effects of meditation may even protect our cells from damage associated with aging, as well as from autoimmune disease and other inflammatory conditions. A Harvard Medical School team reported in 2008 that it found these beneficial changes in the genes of people who regularly practiced meditation, yoga and other relaxation-inducing routines.
Meanwhile, Emory University scientists found in 2007 that those who meditated regularly seemed to avoid some normal age-related decline of gray matter in a part of the brain that helps control motor skills and learning.
The disciplined repetition of redirecting attention—the way Krause does—is what seems to drive the brain changes that can be seen in brain imaging studies. It’s much the same as what happens with a musician repeatedly playing scales or an athlete or dancer practicing a movement.
Adds gray matter
Joshua Grant, a scientist at the University of Montreal, has shown that longtime Zen meditators are less sensitive to pain than control subjects—and it may be because they have a thicker layer of gray matter in the anterior cingulate cortex, a brain region known to be involved in processing pain. Heightened or sustained brain activity may cause the cortex (gray matter) to get thicker, just as working out a muscle would make the muscle bigger.
As we age, we see a natural drop in that thickness, Grant says. But repeated experiments suggest that meditation preserves or even builds up the density of neurons in various regions, suggesting that those who meditate may actually be keeping their brains younger and healthier.