We know that exercise is good for the body, but it’s also incredibly
good for the brain. As the authors of “The Sharp Brains Guide to Brain
Fitness: 18 Interviews with Scientists, Practical Advice, and Product
Reviews to Keep Your Brain Sharp” point out, physical exercise is one of
the four pillars of brain fitness, the other three being good
nutrition, stress management, and mental stimulation. Exercise gets rid
of harmful stress chemicals and it boosts problem-solving, planning,
and attention. Getting more exercise will help you improve your
cognitive functions whether you’re a high school or college student,
part of the work force, or an elderly person in retirement.
Below you’ll find interesting data from two books, filled with
information on how our brains work, which describe the science behind
the discovery that our brain functions much better when we exercise.
The First Brain Rule is to Exercise In the New York Times bestseller
“Brain Rules: 12 Principles for Surviving and Thriving at Work, Home,
and School”, Dr. John Medina—a developmental molecular biologist focused
on the genes involved in human brain development—shares 12 rules that
will improve the functioning of your brain so that you can get the most
out of it. He explains that the first rule for getting your brain to
work at its best is to exercise. Dr. Medina argues that if we were to
design an almost perfect anti-brain environment, it would look like our
current classrooms and work cubicles.
Why?
Because a protein called BDNF (brain-derived neurotrophic
factor)–which builds and nourishes the infrastructure of cell circuitry
in the brain—is created when you’re physically active. Dr. Medina
basically calls BDNF brain fertilizer, and he equates a group of kids
sitting around in a classroom listening to a lecture, or an employee
sitting in a cramped cubicle typing away at his computer, with a light
bulb that is turned off. However, when the kids are out on the
playground, or the employee is walking to work, the light bulb is turned
on. He suggests that employees have “walking meetings” in a
treadmill conference room, that they move around the office as they
speak on the phone, or that they sit on exercise balls and bounce up and
down as they read their e-mails. Creative solutions can also be found
to get kids in the classroom to be more physically active.
In addition, Dr. Medina explains that in 18 studies of older adults,
those who exercised outperformed those who did not in long-term memory,
reasoning, attention, problem-solving, abstract thinking, and more. He
goes on to say that an active lifestyle means half the risk of dementia
and half the risk of cognitive impairment for these older adults. In
this time of increased longevity, regular exercise is an important
protective element against the progression of age, if we hope to live
not just longer, but better.
Two more reasons why exercise improves cognition are the following:
First, exercise increases oxygen flow to the brain, which reduces
brain-bound free radicals. In addition, in order to get more oxygen to
the brain, you need more blood vessels, and exercise increases and
deepens blood vessels. And second, exercise acts directly on the
molecular machinery of the brain itself; it increases neurons’ creation,
survival, and resistance to damage and stress.
How Exercise Promotes Learning In “Spark: The Revolutionary New
Science of Exercise and the Brain”, Dr. John Ratey, clinical associate
professor of psychiatry at Harvard Medical School, contends that
“exercise is the single most powerful tool you have to optimize brain
function.” In his book, he explains how sustained aerobic exercise
promotes learning in three main ways. First,exercise activates the
executive functioning area of the brain, or the frontal cortex. This
activation makes people more attentive, less impulsive, and less
fidgety. When someone can sustain their attention for a longer period
of time, it promotes their ability to sort though information and better
absorb it. Dr. Ratey explains that the second way in which exercise
improves the functioning of the brain is that it improves the
environment in which the nerve cells in our brains live. It does this
by promoting the release of neurotransmitters, hormones, and other
elements of brain chemistry which help prime these cells to perform
their functions efficiently.
Third, exercise promotes neurogenesis, or the process of growing new
brain cells. Although for many years it was believed that the number of
neurons in the adult brain remained fixed, research conducted in the
last few years has shown otherwise. Specifically, exercise adds more
brain cells in the area of the brain which has to do with learning and
memory, which is an areacalled the hippocampus, also known as “The Grand
Central Station” for memory. In fact, Dr. Ratey goes on to say that
there’s nothing that we know of that adds new brain cells better than exercise.
So, for how long should you exercise? Dr. Ratey recommends that you exercise about thirty minutes a day, almost daily.
As an aside, teachers and parents will want to read about the
revolutionary fitness program in Naperville, Illinois–documented
in“Spark”–which put the local school district of 19,000 kids first in
the world in science test scores. Conclusion As Dr. Medina points out,
exercise strengthens muscles and bones, reduces the risk of Alzheimer’s,
regulates appetite, improves fluid intelligence, decreases risk for
heart disease, decreases chances of diabetes, improves long-term memory,
and has many more benefits. For your body’s health, and for your
brain’s health, make exercising a part of your regular routine. Be sure
to check with your doctor before starting an exercise program.
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