TEDWomen 2017
Wendy Suzuki: The brain-changing benefits of exercise
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What's the most transformative thing that you can do for your brain today? Exercise! says neuroscientist Wendy Suzuki. Get inspired to go to the gym as Suzuki discusses the science of how working out boosts your mood and memory -- and protects your brain against neurodegenerative diseases like Alzheimer's.
Wendy Suzuki - Neuroscientist, author
Wendy Suzuki is researching the science behind the extraordinary, life-changing effects that physical activity can have on the most important organ in your body: your brain. Full bio
Wendy Suzuki is researching the science behind the extraordinary, life-changing effects that physical activity can have on the most important organ in your body: your brain. Full bio
Double-click the English transcript below to play the video.
00:12
What if I told you there was something
that you can do right now
that you can do right now
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that would have an immediate,
positive benefit for your brain
positive benefit for your brain
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including your mood and your focus?
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And what if I told you that same thing
could actually last a long time
could actually last a long time
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and protect your brain
from different conditions
from different conditions
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like depression,
Alzheimer's disease or dementia.
Alzheimer's disease or dementia.
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Would you do it?
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Yes!
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I am talking about the powerful effects
of physical activity.
of physical activity.
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Simply moving your body,
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has immediate, long-lasting
and protective benefits for your brain.
and protective benefits for your brain.
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And that can last
for the rest of your life.
for the rest of your life.
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So what I want to do today
is tell you a story
is tell you a story
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about how I used my deep
understanding of neuroscience,
understanding of neuroscience,
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as a professor of neuroscience,
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to essentially do an experiment on myself
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in which I discovered
the science underlying
the science underlying
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why exercise
is the most transformative thing
is the most transformative thing
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that you can do for your brain today.
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01:15
Now, as a neuroscientist,
I know that our brains,
I know that our brains,
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that is the thing in our head right now,
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that is the most complex structure
known to humankind.
known to humankind.
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01:27
But it's one thing
to talk about the brain,
to talk about the brain,
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and it's another to see it.
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So here is a real preserved human brain.
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And it's going to illustrate two key areas
that we are going to talk about today.
that we are going to talk about today.
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The first is the prefrontal cortex,
right behind your forehead,
right behind your forehead,
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critical for things like decision-making,
focus, attention and your personality.
focus, attention and your personality.
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The second key area is located
in the temporal lobe, shown right here.
in the temporal lobe, shown right here.
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You have two temporal lobes in your brain,
the right and the left,
the right and the left,
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and deep in the temporal lobe
is a key structure
is a key structure
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critical for your ability
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to form and retain new long-term
memories for facts and events.
memories for facts and events.
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And that structure
is called the hippocampus.
is called the hippocampus.
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02:08
So I've always been fascinated
with the hippocampus.
with the hippocampus.
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How could it be that an event
that lasts just a moment,
that lasts just a moment,
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say, your first kiss,
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or the moment your first child was born,
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can form a memory
that has changed your brain,
that has changed your brain,
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that lasts an entire lifetime?
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That's what I want to understand.
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I wanted to start and record
the activity of individual brain cells
the activity of individual brain cells
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in the hippocampus
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as subjects were forming new memories.
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And essentially try and decode how
those brief bursts of electrical activity,
those brief bursts of electrical activity,
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which is how neurons
communicate with each other,
communicate with each other,
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how those brief bursts either allowed us
to form a new memory, or did not.
to form a new memory, or did not.
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02:52
But a few years ago,
I did something very unusual in science.
I did something very unusual in science.
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As a full professor of neural science,
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I decided to completely switch
my research program.
my research program.
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Because I encountered something
that was so amazing,
that was so amazing,
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with the potential to change so many lives
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that I had to study it.
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I discovered and I experienced
the brain-changing effects of exercise.
the brain-changing effects of exercise.
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And I did it in a completely
inadvertent way.
inadvertent way.
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I was actually at the height
of all the memory work that I was doing --
of all the memory work that I was doing --
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data was pouring in,
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I was becoming known in my field
for all of this memory work.
for all of this memory work.
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And it should have been going great.
It was, scientifically.
It was, scientifically.
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But when I stuck my head
out of my lab door,
out of my lab door,
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I noticed something.
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I had no social life.
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I spent too much time
listening to those brain cells
listening to those brain cells
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in a dark room, by myself.
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(Laughter)
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I didn't move my body at all.
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I had gained 25 pounds.
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And actually, it took me
many years to realize it,
many years to realize it,
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I was actually miserable.
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And I shouldn't be miserable.
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And I went on a river-rafting trip --
by myself, because I had no social life.
by myself, because I had no social life.
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And I came back --
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(Laughter)
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thinking, "Oh, my God,
I was the weakest person on that trip."
I was the weakest person on that trip."
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And I came back with a mission.
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I said, "I'm never going to feel
like the weakest person
like the weakest person
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on a river-rafting trip again."
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And that's what made me go to the gym.
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And I focused my type-A personality
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on going to all the exercise
classes at the gym.
classes at the gym.
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I tried everything.
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I went to kickbox,
dance, yoga, step class,
dance, yoga, step class,
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and at first it was really hard.
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But what I noticed is that after every
sweat-inducing workout that I tried,
sweat-inducing workout that I tried,
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I had this great mood boost
and this great energy boost.
and this great energy boost.
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And that's what kept me
going back to the gym.
going back to the gym.
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Well, I started feeling stronger.
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I started feeling better,
I even lost that 25 pounds.
I even lost that 25 pounds.
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And now, fast-forward a year and a half
into this regular exercise program
into this regular exercise program
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and I noticed something that really
made me sit up and take notice.
made me sit up and take notice.
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I was sitting at my desk,
writing a research grant,
writing a research grant,
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and a thought went through my mind
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that had never gone
through my mind before.
through my mind before.
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And that thought was,
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"Gee, grant-writing is going well today."
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And all the scientists --
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(Laughter)
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yeah, all the scientists
always laugh when I say that,
always laugh when I say that,
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because grant-writing never goes well.
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It is so hard; you're always
pulling your hair out,
pulling your hair out,
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trying to come up with that
million-dollar-winning idea.
million-dollar-winning idea.
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But I realized that
the grant-writing was going well,
the grant-writing was going well,
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because I was able
to focus and maintain my attention
to focus and maintain my attention
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for longer than I had before.
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And my long-term memory --
what I was studying in my own lab --
what I was studying in my own lab --
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seemed to be better in me.
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And that's when I put it together.
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Maybe all that exercise
that I had included and added to my life
that I had included and added to my life
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was changing my brain.
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Maybe I did an experiment on myself
without even knowing it.
without even knowing it.
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So as a curious neuroscientist,
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I went to the literature to see
what I could find about what we knew
what I could find about what we knew
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about the effects
of exercise on the brain.
of exercise on the brain.
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And what I found was an exciting
and a growing literature
and a growing literature
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that was essentially showing everything
that I noticed in myself.
that I noticed in myself.
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Better mood, better energy,
better memory, better attention.
better memory, better attention.
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And the more I learned,
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the more I realized
how powerful exercise was.
how powerful exercise was.
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Which eventually
led me to the big decision
led me to the big decision
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to completely shift my research focus.
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And so now, after several years
of really focusing on this question,
of really focusing on this question,
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I've come to the following conclusion:
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that exercise is
the most transformative thing
the most transformative thing
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that you can do for your brain today
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for the following three reasons.
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Number one: it has
immediate effects on your brain.
immediate effects on your brain.
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A single workout that you do
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will immediately increase
levels of neurotransmitters
levels of neurotransmitters
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like dopamine, serotonin
and noradrenaline.
and noradrenaline.
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That is going to increase your mood
right after that workout,
right after that workout,
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exactly what I was feeling.
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My lab showed, that a single workout
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can improve your ability
to shift and focus attention,
to shift and focus attention,
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and that focus improvement
will last for at least two hours.
will last for at least two hours.
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And finally, studies have shown
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that a single workout
will improve your reaction times
will improve your reaction times
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which basically means
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that you are going to be faster
at catching that cup of Starbucks
at catching that cup of Starbucks
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that falls off the counter,
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which is very, very important.
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(Laughter)
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But these immediate effects are transient,
they help you right after.
they help you right after.
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What you have to do is do what I did,
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that is change your exercise regime,
increase your cardiorespiratory function,
increase your cardiorespiratory function,
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to get the long-lasting effects.
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And these effects are long-lasting
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because exercise actually
changes the brain's anatomy,
changes the brain's anatomy,
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physiology and function.
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Let's start with my favorite
brain area, the hippocampus.
brain area, the hippocampus.
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The hippocampus --
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or exercise actually
produces brand new brain cells,
produces brand new brain cells,
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new brain cells in the hippocampus,
that actually increase its volume,
that actually increase its volume,
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as well as improve
your long-term memory, OK?
your long-term memory, OK?
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And that including in you and me.
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Number two: the most common finding
in neuroscience studies,
in neuroscience studies,
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looking at effects of long-term exercise,
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is improved attention function
dependent or your prefrontal cortex.
dependent or your prefrontal cortex.
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You not only get
better focus and attention,
better focus and attention,
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but the volume of the hippocampus
increases as well.
increases as well.
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And finally, you not only get
immediate effects of mood with exercise
immediate effects of mood with exercise
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but those last for a long time.
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So you get long-lasting increases
in those good mood neurotransmitters.
in those good mood neurotransmitters.
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But really, the most transformative thing
that exercise will do
that exercise will do
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is its protective effects on your brain.
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Here you can think
about the brain like a muscle.
about the brain like a muscle.
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The more you're working out,
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the bigger and stronger your hippocampus
and prefrontal cortex gets.
and prefrontal cortex gets.
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Why is that important?
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Because the prefrontal cortex
and the hippocampus
and the hippocampus
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are the two areas that are most
susceptible to neurodegenerative diseases
susceptible to neurodegenerative diseases
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and normal cognitive decline in aging.
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So with increased exercise
over your lifetime,
over your lifetime,
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you're not going to cure
dementia or Alzheimer's disease,
dementia or Alzheimer's disease,
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but what you're going to do
is you're going to create
is you're going to create
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the strongest, biggest hippocampus
and prefrontal cortex
and prefrontal cortex
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so it takes longer for these diseases
to actually have an effect.
to actually have an effect.
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You can think of exercise, therefore,
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as a supercharged 401K for your brain, OK?
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And it's even better, because it's free.
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So this is the point in the talk
where everybody says,
where everybody says,
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"That sounds so interesting, Wendy,
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but I really will only
want to know one thing.
want to know one thing.
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And that is, just tell me
the minimum amount of exercise
the minimum amount of exercise
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I need to get all these changes."
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(Laughter)
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And so I'm going to tell you
the answer to that question.
the answer to that question.
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First, good news: you don't have to become
a triathlete to get these effects.
a triathlete to get these effects.
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The rule of thumb is you want to get
three to four times a week exercise
three to four times a week exercise
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minimum 30 minutes an exercise session,
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and you want to get aerobic exercise in.
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That is, get your heart rate up.
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And the good news is,
you don't have to go to the gym
you don't have to go to the gym
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to get a very expensive gym membership.
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Add an extra walk around the block
in your power walk.
in your power walk.
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You see stairs -- take stairs.
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And power-vacuuming can be as good
as the aerobics class
as the aerobics class
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that you were going to take at the gym.
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So I've gone from memory pioneer
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to exercise explorer.
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From going into the innermost
workings of the brain,
workings of the brain,
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to trying to understand how exercise
can improve our brain function,
can improve our brain function,
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and my goal in my lab right now
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is to go beyond that rule of thumb
that I just gave you --
that I just gave you --
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three to four times a week, 30 minutes.
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I want to understand
the optimum exercise prescription
the optimum exercise prescription
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for you, at your age,
at your fitness level,
at your fitness level,
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for your genetic background,
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to maximize the effects of exercise today
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and also to improve your brain
and protect your brain the best
and protect your brain the best
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for the rest of your life.
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But it's one thing to talk about exercise,
and it's another to do it.
and it's another to do it.
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So I'm going to invoke my power
as a certified exercise instructor,
as a certified exercise instructor,
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to ask you all to stand up.
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(Laughter)
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We're going to do
just one minute of exercise.
just one minute of exercise.
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It's call-and-response,
just do what I do, say what I say,
just do what I do, say what I say,
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and make sure you don't punch
your neighbor, OK?
your neighbor, OK?
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Music!
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(Upbeat music)
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Five, six, seven, eight,
it's right, left, right, left.
it's right, left, right, left.
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And I say, I am strong now.
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Let's hear you.
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Audience: I am strong now.
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Wendy Suzuki: Ladies,
I am Wonder Woman-strong.
I am Wonder Woman-strong.
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Let's hear you!
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Audience: I am Wonder Woman-strong.
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WS: New move -- uppercut, right and left.
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I am inspired now. You say it!
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Audience: I am inspired now.
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WS: Last move -- pull it down,
right and left, right and left.
right and left, right and left.
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I say, I am on fire now! You say it.
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Audience: I am on fire now.
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WS: And done! OK, good job!
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(Applause)
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Thank you.
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I want to leave you with one last thought.
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And that is, bringing
exercise in your life
exercise in your life
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will not only give you
a happier, more protective life today,
a happier, more protective life today,
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but it will protect your brain
from incurable diseases.
from incurable diseases.
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And in this way it will change
the trajectory of your life
the trajectory of your life
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for the better.
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Thank you very much.
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(Applause)
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Thank you.
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(Applause)
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ABOUT THE SPEAKER
Wendy Suzuki - Neuroscientist, authorWendy Suzuki is researching the science behind the extraordinary, life-changing effects that physical activity can have on the most important organ in your body: your brain.
Why you should listen
Dr. Wendy A. Suzuki is a Professor of Neural Science and Psychology in the Center for Neural Science at New York University, an author, storyteller and fitness instructor. She received her undergraduate degree in physiology and human anatomy at the University of California, Berkeley in 1987 studying with Prof. Marion C. Diamond, a leader in the field of brain plasticity. She went on to earn her PhDin Neuroscience from U.C. San Diego in 1993 and completed a post-doctoral fellowship at the National Institutes of Health before accepting her faculty position at New York University in 1998.
Suzuki's major research interest continues to be brain plasticity. She is best known for her extensive work studying areas in the brain critical for our ability to form and retain new long-term memories. More recently, her work has focused on understanding how aerobic exercise can be used to improve learning, memory and higher cognitive abilities in humans. She is passionate about teaching, about exercise (intenSati) and about supporting and mentoring up and coming scientists.
Wendy Suzuki | Speaker | TED.com