Exercise and the Brain: The
Mental Benefits
How
cutting-edge research is showing the positive mental effects of moving the
body.
Nearly
every American can probably remember their doctor telling them to exercise, but
for what reason? Many people think that this recommendation simply benefits the
physical body. For instance, people may lift weights to look muscular or run for
miles to burn the pizza they ate last night. However, in his groundbreaking
2013 book Spark: The Revolutionary New
Science of Exercise and the Brain, Dr. John Ratey from Harvard Medical
School explains that the true benefits of exercise are found within the brain.
While there are physical benefits, these pale in comparison to the profound
mental benefits exercise causes.
In
this article, I will explain the numerous benefits of exercise. First, I will
describe how exercise is scientifically proven to increase learning and
motivation. After that, I will discuss how exercise is as effective in treating
problems like depression and stress as prescription drugs. Lastly, I will talk
about what you can do to reap the positive mental benefits of exercise.
Learning and Motivation
The
objective of most gym classes is to get children to move around and improve
students’ physical well-being. However, the paradox is changing to shift PE
programs from sports based to intensive fitness exercise based. In Naperville,
Illinois, one such fitness based physical education program began in the early
1990s with the intent to stress fitness. What exactly does “fitness based
physical education” look like? The teachers use heart rate monitors to track
the physical workload of students as they exercise aerobically, whether this be
while students run miles or exercise on high-end Schwinn stationary bikes. The
monitors allows teachers to track the intensity of the students’ workouts
(relative to their maximum heart rate value).
 |
| Heart rate monitor. Courtesy of heartratemonitorz.com |
Since the program’s
implementation, not only have the Naperville students become physically fit, but
their tests scores increased along fitness level. As Ratey explains, “When the
students in Titusville or in Naperville go for a mile run in gym, they are more
prepared to learn in their other classes: their senses are heightened; their
focus and mood are improved; they’re less fidgety and tense; and they feel more
motivated and invigorated.” Why has students’ learning increased as they have
exercised more? Exercise literally creates new nerve cells from stem cells,
thus creating new mental capacity (New York Times). “In addition to priming our
state of mind, exercise influences learning directly, at the cellular level,
improving the brain’s potential to log in and process new information.” (Ratey)
There is education data to backup this theory. The Naperville 203 school
district scored number one in the world in math and number six in the world in
science for the TIMSS education test. For context, the average US school scored
eighteenth in science and nineteenth in math relative to the world.
Regulating Emotions
Another
non-physical, mental benefit from exercise is its ability to combat stress,
anxiety, and depression. When people are stressed out, the brain gets locked
into a pattern of stress. Over time, this pattern can be damaging and makes
people feel like the stress will never end. However, moving the body can combat
the stress. Exercise controls stress on a cellular level, thus leaving people
feeling emotionally and physically because the cells repaired while the body
moves. Due to the fight-or-flight phenomenon, in which human beings evolved to
either fight or run during stressful situations, when people exercise when
stressed, they actually are doing what the human body was built to do. This is
a main reason why moving the body can help relieve stress.
Approximately
18% of the US population suffers from anxiety. In the brain, anxiety is when
the sympathetic nervous system and the hypothalamic-pituitary-adrenal (HPA)
axis increase activity. As doctor Ratey explains, “By using exercise to combat
the symptoms of anxiety, you can treat the state, and as your level of fitness
improves, you chip away at the trait. Over time, you teach your brain that the
symptoms don’t always spell doom and that you can survive; you’re reprogramming
the cognitive misinterpretation.” Overall, exercise while anxious provides a
distraction, reduces muscle tension, builds brain resources, teaches different
outcome, reroutes your circuits, and improves resilience.
With
the emergence of function MRI and PET scans, scientists have been able to see
what depression looks like in the brain. Essentially, depression is a change to
the “emotional circuitry” of the brain and its messengers such as
norepinephrine, dopamine, and serotonin. This leads to a breakdown at the
cellular level, in which the brain is trapped in a negative cycle it cannot
work its way out of. Dr. Ratey finds that exercise is as good if not better of
a prescription for a person suffering from depression than modern drugs like
Zoloft or Lexapro. Scientific literature reinforces this idea. In fact, “a
review of studies stretching back to 1981 concluded that regular exercise … may
play a supporting role in treating severe depression” (Harvard).
What
Kind of Exercise and for How Long?
After
reading about the numerous positive effects of exercise, you might wonder what
types and for how long you should exercise. Unfortunately, it is not clear
which type of exercise brings about the best mental benefits. As a rule of
thumb, some exercise is better than nothing and more is better than less. Research
has shown the more in-shape you are, the better your cognitive health (Wall
Street Journal). A variety of studies have shown that aerobic exercise can
increase capillary volume in the memory area of the hippocampus, increase
neurotransmitters and neurotrophic factors, and encourage neuroplasticity. There
is essentially a positive relationship between mental and physical strength. So
whether you run, cycle, or swim, you should mix up medium intensity workouts
and high intensity workouts to gain the benefits of exercising different muscle
groups.
As
previously mentioned, although exercise has many physical benefits, there are
numerous mental benefits too. Exercise has the ability to help people learn
better and increase their motivation. Furthermore, exercise can combat problems
such as stress, anxiety, and depression.
Works
Cited
"Exercise
Boosts Brain Power." Wall Street
Journal, 11 Feb. 2011.
Ratey,
John J., and Eric Hagerman. Spark: The
Revolutionary New Science of Exercise and the Brain. New York: Little,
Brown, 2008. Print.
"Regular
Exercise Changes the Brain to Improve Memory, Thinking Skills - Harvard Health
Blog." Harvard Health Blog RSS.
Harvard, 09 Apr. 2014
Reynolds,
Gretchen. "How Exercise Could Lead to a Better Brain." The New York Times. The New York Times,
21 Apr. 2012.