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By GRETCHEN REYNOLDS
New York Times
April 18, 2012

The value of mental-training games may be speculative, as Dan Hurley writes in his article on the quest to make ourselves smarter, but there is another, easy-to-achieve, scientifically proven way to make yourself smarter. Go for a walk or a swim. For more than a decade, neuroscientists and physiologists have been gathering evidence of the beneficial relationship between exercise and brainpower. But the newest findings make it clear that this isn’t just a relationship; it is the relationship. Using sophisticated technologies to examine the workings of individual neurons — and the makeup of brain matter itself — scientists in just the past few months have discovered that exercise appears to build a brain that resists physical shrinkage and enhance cognitive flexibility. Exercise, the latest neuroscience suggests, does more to bolster thinking than thinking does.

The most persuasive evidence comes from several new studies of lab animals living in busy, exciting cages. It has long been known that so-called “enriched” environments — homes filled with toys and engaging, novel tasks — lead to improvements in the brainpower of lab animals. In most instances, such environmental enrichment also includes a running wheel, because mice and rats generally enjoy running. Until recently, there was little research done to tease out the particular effects of running versus those of playing with new toys or engaging the mind in other ways that don’t increase the heart rate.

So, last year a team of researchers led by Justin S. Rhodes, a psychology professor at the Beckman Institute for Advanced Science and Technology at the University of Illinois, gathered four groups of mice and set them into four distinct living arrangements. One group lived in a world of sensual and gustatory plenty, dining on nuts, fruits and cheeses, their food occasionally dusted with cinnamon, all of it washed down with variously flavored waters. Their “beds” were colorful plastic igloos occupying one corner of the cage. Neon-hued balls, plastic tunnels, nibble-able blocks, mirrors and seesaws filled other parts of the cage. Group 2 had access to all of these pleasures, plus they had small disc-shaped running wheels in their cages. A third group’s cages held no embellishments, and they received standard, dull kibble. And the fourth group’s homes contained the running wheels but no other toys or treats.

All the animals completed a series of cognitive tests at the start of the study and were injected with a substance that allows scientists to track changes in their brain structures. Then they ran, played or, if their environment was unenriched, lolled about in their cages for several months.

Afterward, Rhodes’s team put the mice through the same cognitive tests and examined brain tissues. It turned out that the toys and tastes, no matter how stimulating, had not improved the animals’ brains.

“Only one thing had mattered,” Rhodes says, “and that’s whether they had a running wheel.” Animals that exercised, whether or not they had any other enrichments in their cages, had healthier brains and performed significantly better on cognitive tests than the other mice. Animals that didn’t run, no matter how enriched their world was otherwise, did not improve their brainpower in the complex, lasting ways that Rhodes’s team was studying. “They loved the toys,” Rhodes says, and the mice rarely ventured into the empty, quieter portions of their cages. But unless they also exercised, they did not become smarter.

Why would exercise build brainpower in ways that thinking might not? The brain, like all muscles and organs, is a tissue, and its function declines with underuse and age. Beginning in our late 20s, most of us will lose about 1 percent annually of the volume of the hippocampus, a key portion of the brain related to memory and certain types of learning.

Exercise though seems to slow or reverse the brain’s physical decay, much as it does with muscles. Although scientists thought until recently that humans were born with a certain number of brain cells and would never generate more, they now know better. In the 1990s, using a technique that marks newborn cells, researchers determined during autopsies that adult human brains contained quite a few new neurons. Fresh cells were especially prevalent in the hippocampus, indicating that neurogenesis — or the creation of new brain cells — was primarily occurring there. Even more heartening, scientists found that exercise jump-starts neurogenesis. Mice and rats that ran for a few weeks generally had about twice as many new neurons in their hippocampi as sedentary animals. Their brains, like other muscles, were bulking up.

But it was the ineffable effect that exercise had on the functioning of the newly formed neurons that was most startling. Brain cells can improve intellect only if they join the existing neural network, and many do not, instead rattling aimlessly around in the brain for a while before dying.

One way to pull neurons into the network, however, is to learn something. In a 2007 study, new brain cells in mice became looped into the animals’ neural networks if the mice learned to navigate a water maze, a task that is cognitively but not physically taxing. But these brain cells were very limited in what they could do. When the researchers studied brain activity afterward, they found that the newly wired cells fired only when the animals navigated the maze again, not when they practiced other cognitive tasks. The learning encoded in those cells did not transfer to other types of rodent thinking.

Exercise, on the other hand, seems to make neurons nimble. When researchers in a separate study had mice run, the animals’ brains readily wired many new neurons into the neural network. But those neurons didn’t fire later only during running. They also lighted up when the animals practiced cognitive skills, like exploring unfamiliar environments. In the mice, running, unlike learning, had created brain cells that could multitask.

Just how exercise remakes minds on a molecular level is not yet fully understood, but research suggests that exercise prompts increases in something called brain-derived neurotropic factor, or B.D.N.F., a substance that strengthens cells and axons, fortifies the connections among neurons and sparks neurogenesis. Scientists can’t directly study similar effects in human brains, but they have found that after workouts, most people display higher B.D.N.F. levels in their bloodstreams.

Few if any researchers think that more B.D.N.F. explains all of the brain changes associated with exercise. The full process almost certainly involves multiple complex biochemical and genetic cascades. A recent study of the brains of elderly mice, for instance, found 117 genes that were expressed differently in the brains of animals that began a program of running, compared with those that remained sedentary, and the scientists were looking at only a small portion of the many genes that might be expressed differently in the brain by exercise.

Whether any type of exercise will produce these desirable effects is another unanswered and intriguing issue. “It’s not clear if the activity has to be endurance exercise,” says the psychologist and neuroscientist Arthur F. Kramer, director of the Beckman Institute at the University of Illinois and a pre-eminent expert on exercise and the brain. A limited number of studies in the past several years have found cognitive benefits among older people who lifted weights for a year and did not otherwise exercise. But most studies to date, and all animal experiments, have involved running or other aerobic activities.

Whatever the activity, though, an emerging message from the most recent science is that exercise needn’t be exhausting to be effective for the brain. When a group of 120 older men and women were assigned to walking or stretching programs for a major 2011 study, the walkers wound up with larger hippocampi after a year. Meanwhile, the stretchers lost volume to normal atrophy. The walkers also displayed higher levels of B.D.N.F. in their bloodstreams than the stretching group and performed better on cognitive tests.

In effect, the researchers concluded, the walkers had regained two years or more of hippocampal youth. Sixty-five-year-olds had achieved the brains of 63-year-olds simply by walking, which is encouraging news for anyone worried that what we’re all facing as we move into our later years is a life of slow (or not so slow) mental decline.

Prevent computer vision syndrome with these seven simple eye-saving tips.
By Anna Soref
Yoga Journal

You’ve been sitting in front of your computer for two hours trying to ignore your stinging, dry eyes and get through your work. You can’t quit now….If only your eyes would stop burning.

Tired eyes and blurry vision are but two symptoms of what is now recognized as a broader problem called computer vision syndrome, or CVS. As computer use continues to rise, so do cases of CVS. A recent study showed that nearly 90 percent of employees who work with computers for more than three hours a day suffer from some form of eye trouble.

CVS has a host of causes, from improper lighting, screen glare, and an ill-adapted workspace, to poor posture and glasses or contact lenses with incorrect prescriptions, according to Kent M. Daum, O.D., Ph.D., of the School of Optometry of the University of Alabama, Birmingham. Infrequent blinking is another culprit. We blink to keep the eyes lubricated, explains Daum. When staring at a computer screen, we blink less, so the eyes become dry. And the more we concentrate, the less we blink, so casually surfing the Web may be easier on the eyes than focused work, he says. Also, deficiencies of vitamin A may cause severe eye dryness, so be sure to get enough.

While CVS has not yet been shown to damage vision, there is no need to put up with its uncomfortable symptoms. Proper workspace ergonomics, frequent breaks from the computer, and eye drops are easy solutions that work. (When choosing eye drops, stay away from those containing phenylephrine or other whitening agents that can worsen symptoms over time.)

Dimming the lights in the workspace can also reduce eye fatigue. “The eye adjusts to the relatively dim computer screen. If you have a brightly lit office, whenever you look away from the screen, your eyes have to adjust to that brighter light, which can lead to eye fatigue,” Daum explains.

In addition, Judith Lasater, Ph.D., author of Relax and Renew: Restful Yoga for Stressful Times (Rodmell, 1995), recommends adjusting the computer so that the eyes rest at the level just below the tips of the ears; this will put the head in a more relaxed, comfortable position. She also says to pull your shoulder blades down, “like tucking in a shirt,” for a long back and open chest.To release overall tension (which she feels contributes to eye distress), Lasater suggests a version of Savasana (Corpse Pose) tailored for the eyes. Lie down in Savasana with a stack of several books lying nearby on the floor by the top of your head. Place either a five-pound bag of rice or some sandbags halfway on the books and halfway on your forehead. Relax for 15 minutes. This will help the muscles in the head to loosen and relax.

STOCKBAUER

TERRY

HAGITOMO

MARK FOSTER

MICHAEL PHELPS

In the easy stretch spend 10 – 15 seconds holding the stretch. Push the stretch until you feel a mild tension. Remember to relax as you hold each stretch. The feeling of tension should slowly reduce as you hold the stretch position. You should feel the stretch, but without pain. If the tension does not subside, ease off slightly and to an amount of tension that is comfortable for you. The easy stretch reduces muscular tightness and tension and prepares the tissues for the developmental stretch.

The developmental stretch
Now move slowly into the developmental stretch. Do not bounce. Move a little bit further until you again feel a small amount of tension and hold the position for 10 – 15 seconds. Stay in control. The tension should decrease, if it does not, lessen the tension slightly. If the stretch tension increases as you hold the stretch or it is painful, you are stretching too far. The developmental stretch fine tunes the muscles and increases your flexibility.

Breathing
Your breath should be slow, rhythmical, and under control. If you are bending forward during a stretch, exhale as you bend forward and breathe slowly as you hold the stretch. Don’t hold your breath while stretching. If a position changes or prevents a natural breathing pattern, then you are not relaxed. Ease up on the stretch to resume your natural breathing.

Counting
In the beginning, silently count the seconds as you hold each stretch, this will help you to hold the proper tension for the right amount of time. In a while, you will be able to stretch by how it feels, without having to count the time you hold the stretch.

Warming up
Before you stretch, you should do a few minutes of warming up (ie. walking, swinging arms) to loosen the muscles and related soft tissue. This will get the blood moving. It is important to warm up and stretch properly.

It is possible to injure yourself while stretching when:
• you are in too much of a hurry (not relaxed)
• you push too far, too soon (overstretching a cold muscle)
• you are not paying attention to the feeling of the stretch

If you are running, cycling or doing some other activity: warm up by doing the activity you are about to do, but at a lesser intensity for about 2 – 5 minutes. THEN STRETCH.

Cooling down
You should cool down after exercise by doing a scaled down version of the main workout. Get your heart rate back down towards a resting rate. Then stretch to prevent muscle soreness and stiffness.

Stretching © 2000 by Bob and Jean Anderson. Shelter Publications, Inc.

Muscle tension
Muscles, in the course of their work, use oxygen and nutrients and produce carbon dioxide and waste products. The principle waste product of muscle metabolism is called lactic acid. Nutrients and wastes are transported to and from muscles by the blood circulation, and so the efficiency of this transport system is dependent upon good blood flow. Poor or insufficient blood flow causes an accumulation of lactic acid producing tension in muscles.

Muscle pain
There are many types and causes of muscle pain, but all of us are familiar with the stiff achy feeling of a muscle which is reacting to an unusual level of exercise, a chronic strain or build-up of stress-related tension. This achiness is caused by the development of lactic acid residues in the muscles tissue, compounded by the fact that a tight muscle clamps down on its supply blood vessels and impedes drainage of its own tissue.

Massage
Massage acts on the tight achy muscle in several ways. It helps relax tension and spasm and promotes the release of lactic acid from the tissue. This relaxing action automatically enhances the function of the supplying blood vessels. In addition, massage actively increases the rate of blood flow to and from the area.

Epsom salts
Because of the high magnesium content, epsom salts bath can be helpful any time you are suffering from achiness and muscle strain. It is an excellent idea for the evening after you have had a massage because it helps to clear out released lactic acid. Without this, there may be a temporary generalized soreness following the massage treatment of a particularly tight area.

Instructions for taking a bath
Epsom salts are readily available at your local pharmacy. Use 2 to 4 cups in a full bath, the temperature of which is as hot as you can comfortably tolerate. You must soak in the bath for a minimum of 20 minutes, without adding any bathing solutions or oils and without using soap, as these substances will alter the chemistry of the water. After soaking for 20 minutes, you may wash or rinse off as you wish.

To replace the fluid you lose as perspiration, keep a glass of cold water beside you and sip it during the bath. If you like, you may also wring a towel in cold water and wrap it around your neck. As with any hot bath, make sure you get out of the tub slowly and carefully.