Physical exercise Archives

To Improve Your Brain, Exercise Your Body

January 15, 2016 by Joycelyn Campbell Leave a Comment

Sitting in front of a computer screen to play brain games is not the best way to enhance or maintain your cognitive abilities. First of all it doesn’t really work. And second, it involves sitting. Standing is only marginally better. (And playing brain games on a portable electronic device while walking is just an accident waiting to happen.)

As John Medina writes in Brain Rules:

The brain appears to be designed to (1) solve problems (2) related to surviving (3) in an unstable outdoor environment, and (4) to do so in nearly constant motion.

The links between physical exercise and brain health have been getting a lot of attention lately. Here are summaries of some of the research with links to the articles (click on the titles). The last two of these studies were included in my post last fall on Five Ways to Improve Your Brain; the first three are more recent.

Get Moving

A neuroscientist (Wendy A. Suzuki) says there are powerful benefits to exercise that are rarely discussed.

When I was about to turn 40, I started working out regularly after years of inactivity. As I sweated my way through cardio, weights, and dance classes, I noticed that exercise wasn’t just changing my body. It was also profoundly transforming my brain—for the better.

The immediate effects of exercise on my mood and thought process proved to be a powerful motivational tool. And as a neuroscientist and workout devotee, I’ve come to believe that these neurological benefits could have profound implications for how we live, learn and age as a society.

Exercise combats stress.
Increased levels of physical exercise can result in improved memory
Exercise improves our ability to shift and focus attention.
Exercise could help students better absorb everything from history lessons to chemistry experiments–and they’d be happier too.
Exercise could make students more imaginative at school and adults more creative at work.
The longer and more regularly you exercise through your life, the lower your chances are of suffering from cognitive decline and dementia as you age.

Do… build your body

We often make a distinction between brains and brawn. In fact, getting in shape is one of the surest ways to build your mind. Physical activity not only establishes a better blood flow to the brain; it also triggers a surge of proteins such as “nerve growth factor” that can help stimulate the growth and maintenance of neural connections in the brain.

The benefits seem to stretch from cradle to grave: children who walk to school get better grades, while taking a leisurely stroll seemed to boost pensioner’s concentration and memory. What’s more, a wide variety of exercises can help, from gentle aerobic exercise to weight training and body building; just choose a training regime that suits your current fitness.

Study suggests physical activity makes it easier for the brain to change

Learning, memory, and brain repair depend on the ability of our neurons to change with experience. Now, researchers reporting in the Cell Press journal Current Biology on December 7 have evidence from a small study in people that exercise may enhance this essential plasticity of the adult brain.

The findings focused on the visual cortex come as hopeful news for people with conditions including amblyopia (sometimes called lazy eye), traumatic brain injury, and more, the researchers say.

“We provide the first demonstration that moderate levels of physical activity enhance neuroplasticity in the visual cortex of adult humans,” says Claudia Lunghi of the University of Pisa in Italy.

“By showing that moderate levels of physical activity can boost the plastic potential of the adult visual cortex, our results pave the way to the development of non-invasive therapeutic strategies exploiting the intrinsic brain plasticity in adult subjects,” she adds.

While further study is needed, the researchers think that this effect may result from a decrease with exercise in an inhibitory neurotransmitter called GABA. As concentrations of this inhibitory nerve messenger decline, the brain becomes more responsive.

Regardless of the mechanism, the findings suggest that exercise plays an important role in brain health and recovery. They come as especially good news for people with amblyopia, which is generally considered to be untreatable in adults.

“Our study suggests that physical activity, which is also beneficial for the general health of the patient, could be used to increase the efficiency of the treatment in adult patients,” Lunghi says.

Lifting weights, twice a week, may aid the brain

Most studies of exercise and brain health have focused on the effects of running, walking or other aerobic activities. A few encouraging past studies have suggested that regular, moderate aerobic exercise such as walking may slow the progression of white matter lesions in older people.

But Teresa Liu-Ambrose, a professor of physical therapy and director of the Aging, Mobility, and Cognitive Neuroscience Laboratory at the University of British Columbia in Vancouver, wondered whether other types of exercise would likewise be beneficial for white matter. In particular, she was interested in weight training, because weight training strengthens and builds muscles.

After a year-long study, women aged 65-75 who had lifted weights twice per week displayed significantly less shrinkage and tattering of their white matter than the other women. Their lesions had grown and multiplied somewhat, but not nearly as much. They also walked more quickly and smoothly than the women in the other two groups.

Note that the result was only achieved in the group who lifted weights twice per week, not in a group who lifted only once a week.

Regular exercise changes the brain to improve memory, thinking skills

In a study done at the University of British Columbia, researchers found that regular aerobic exercise, the kind that gets your heart and your sweat glands pumping, appears to boost the size of the hippocampus, the brain area involved in verbal memory and learning. Resistance training, balance and muscle toning exercises did not have the same results.

Many studies have suggested that the parts of the brain that control thinking and memory (the prefrontal cortex and medial temporal cortex) have greater volume in people who exercise versus people who don’t. “Even more exciting is the finding that engaging in a program of regular exercise of moderate intensity over six months or a year is associated with an increase in the volume of selected brain regions,” says Dr. Scott McGinnis, a neurologist at Brigham and Women’s Hospital and an instructor in neurology at Harvard Medical School.

How much exercise is required? The study participants walked briskly for one hour, twice a week. That’s 120 minutes of moderate intensity exercise a week. Standard recommendations advise half an hour of moderate physical activity most days of the week, or 150 minutes a week. If that seems daunting, start with a few minutes a day, and increase the amount you exercise by five or 10 minutes every week until you reach your goal.

If you don’t want to walk, consider other moderate-intensity exercises, such as swimming, stair climbing, tennis, squash, or dancing. Don’t forget that household activities can count as well, such as intense floor mopping, raking leaves, or anything that gets your heart pumping so much that you break out in a light sweat.

The Seductive Lure of Online Brain Games

January 8, 2016 by Joycelyn Campbell Leave a Comment

You may have heard that Lumosity has agreed to settle with the Federal Trade Commission to the tune of $2 million in response to charges of deceptive advertising:

The FTC alleges that the defendants claimed training with Lumosity would 1) improve performance on everyday tasks, in school, at work, and in athletics; 2) delay age-related cognitive decline and protect against mild cognitive impairment, dementia, and Alzheimer’s disease; and 3) reduce cognitive impairment associated with health conditions, including stroke, traumatic brain injury, PTSD, ADHD, the side effects of chemotherapy, and Turner syndrome, and that scientific studies proved these benefits.

This didn’t surprise me since I’ve been following various researchers’ attempts to substantiate the many claims made by such companies. I was also aware that in 2014, a group of 70 cognitive scientists and neuroscientists issued a statement warning consumers of the hype over brain games:

We object to the claim that brain games offer consumers a scientifically grounded avenue to reduce or reverse cognitive decline when there is no compelling scientific evidence to date that they do. The promise of a magic bullet detracts from the best evidence to date, which is that cognitive health in old age reflects the long-term effects of healthy, engaged lifestyles. In the judgment of the signatories below, exaggerated and misleading claims exploit the anxieties of older adults about impending cognitive decline. We encourage continued careful research and validation in this field.

A large percentage of the population is concerned about cognitive decline. And they’re willing to pay for what appears to be an easy and even enjoyable quick fix. Quick fixes have become increasingly desirable in the internet age, so the concept of using your electronic device to play games devised by someone else to keep your brain in top form is brilliant marketing, if nothing else. It’s a mini, no-stress, workout for your brain.

The jury is still out as to whether brain games offer any long-term effectiveness. One thing that is known is that improving your performance in a particular game leads to improved performance in that particular game. In that regard, computerized games are no different from playing Scrabble or working crossword or Sudoku puzzles. The more crossword puzzles you work, the better you get at working crossword puzzles. The more Sudoku puzzles you complete, the easier the “challenging” puzzles become. That’s just how the brain works. The more often you attempt any task, the quicker and easier it is to do it. Practice may not make perfect but it definitely makes better.

According to David Z. Hambrick, associate professor of psychology at Michigan State University:

[I]f you find that people get better in one test of reasoning, it doesn’t necessarily mean that they’re smart; it means they’re better on one test of reasoning.

In fact, there’s some indication that just playing video games is better than so-called brain games at improving short-term memory capacity and reasoning.

If you like the experience of playing—and getting better at—computerized brain games (and paying for the pleasure), then go ahead and continue doing it. But computerized brain games are unlikely to have any far-reaching or long-term effects on your cognitive abilities.

And, as an article in Scientific American points out, they take up time that could be put to better use. I’ve been saying for some time now that the two things you can do to grow new neurons and increase the number of synaptic connections in your brain (thus expanding your mental model and your cognitive abilities) are:

Move! Engage in physical exercise.
Learn! Study something new and challenging.

That’s it. Do those two things every day and you will not only be doing something effective to forestall cognitive decline, you will also become healthier and potentially even higher-functioning than you already are.

The Scientific Power of Thought

May 10, 2014 by Joycelyn Campbell 2 Comments

I can attest to the power of mental training on increasing physical strength. At the end of January, my personal trainer at the gym suggested I start doing a new exercise. When I went over to the equipment to give it a shot, I struggled to do ONE rep. So I decided to try mental training in addition to the physical training.

Every other day, I sat down in my office chair, closed my eyes, and imagined myself going to the gym and using the equipment. I mentally did three sets of 15 reps for each mental training session. The first time I tried this exercise again at the gym after beginning mental training, I was able to do three sets of five reps. By the fifth session after beginning mental training, I was able to do a full three sets of 15 reps.

The trick to the visualization part of this is that you can’t imagine watching yourself, as if you were looking into a mirror. You have to imagine yourself using the equipment and contracting your muscles just as you would if you were actually doing it.

The next time I start a new exercise, I’ll definitely augment the physical training with mental training.