WEBVTT

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Hi, I'm Kayla, and
we're just going

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to talk really quickly
about technology called EMG.

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EMG stands for
electromyography, which

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sounds really similar to
other technologies you might

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have heard of like ECG and EEG.

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It measures electrical
signals in your body

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from the surface of your body.

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Victor, have you ever
used this before?

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Yeah.

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We have used it a lot here.

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For us, it's very
important to see not only

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the superficial
movement but also

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what happens inside the body
when we move, how do we respond

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to different stimuli, and
how our muscles produce

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the movement that
we are tracking.

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So yeah.

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That's really interesting.

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So what kind of
data is it good for?

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So, what we get from this
is electrical activity

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from your muscles.

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So it just tells us when the
muscle is being activated

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by our brain basically.

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And then we can--
then after that, we

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see the action
happening but then

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this is basically before,
let's say, the action happens.

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So this is how the
muscles are activated

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to produce the movement.

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So if you see,
these are sensors.

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And on the back, we have these
metal pieces sticking out

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of it.

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And that's what actually
contacts the surface

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to measure any kind
of electrical signal

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that's seen on that surface.

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And these things actually
transmit directly

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to this lovely antenna here
so we can get live data in,

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and you don't have to be wired
to the sensor system here.

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So that's a very good advantage
of this system in particular

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because EMG started
as not being wireless.

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So originally you had
to have all these cables

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and then try to perform with
those cables was cumbersome.

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So now with this
type of technologies

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we can do it very
noninvasively, and we also

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have a different--
two types of sensors

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for different applications.

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So this one is bigger
for larger areas,

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and this one comes with a
smaller attachment for smaller,

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more detailed tracking.

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They also include
accelerometers.

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So they also track acceleration
in three directions,

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these same sensors.

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So where are good
locations to put EMG?

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Can you show--

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Yeah.

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--what's good?

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So as we mentioned, they
track muscular activity.

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So we need to put them on
top of the muscle belly

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as it's called.

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So it's normally
prominence in muscles.

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You have to know a
little bit about anatomy

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and where the muscles are
and what each muscle does,

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depending on what
activity you are tracking.

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But when you do
certain movements,

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you can feel some
muscles expand,

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and we normally use those
little movements to track

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where the muscle belly can be.

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And then after palpation, we can
know where to put the sensor.

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This-- the muscles
have muscle fibres,

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and EMG works best when you put
these metallic plates aligned

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with those muscle fibres.

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So again, you have to know
a little bit about anatomy

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when placing these [INAUDIBLE].

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Yep.

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Yeah, so prerequisites
for this technology use

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are an anatomy book,
a simple knowledge

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of physiological pathways,
and a few cables and plugs.

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It takes a lot of practise.

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How long did it take you before
you were good at using EMGs?

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A couple of years.

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A couple of years.

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Yeah, so don't expect to get
this right on the first try.

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Yeah.

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Another important
thing about EMGs,

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because as we mentioned we are
tracking electrical activity,

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we definitely need some good
contact between the sensor

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and the skin, and we need
to be as clean as possible

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on the skin.

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If there's too much hair,
we need to remove the hair.

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We need to clean properly.

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Yeah.

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So we use these
double-sided stickers,

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super advanced technology,
double-sided tape, and usually

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like an alcohol
swab or something

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to clean the surface
of your skin.

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Because as he mentioned,
you need to make sure

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you get a good contact on skin.

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Also be aware if
it's really sunny out

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and you have
sunscreen on, you're

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going to need to
wipe that off too.

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Yep.

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So yeah, the
procedure is quite--

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shouldn't take that long, but
it has to be very detailed

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and you have to
take into account

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all these details to have good--

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good recordings.

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So again, as Kayla
mentioned, you

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won't have it right
in the first trial

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but with practice
you'll get good.

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Yeah.

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So we mentioned a couple
other technologies

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that start with E.
Since those also pick up

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electrical signals in
your body, where would EMG

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pick up those other ECG, EEG?

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Where on your body
would you put those?

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Yeah.

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For starters, if this is very
sensitive to electric charge,

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so anywhere basically
where there is good contact

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and with a clean skin you would
get some electrical activity,

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if you put it around
the chest area,

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you would get some
heart activity.

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So it depends on
your application.

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You might get only heart
data that you don't want.

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If what you want is pectoral
activity and not heart data,

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you have to be careful
where to put it

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on the chest for example.

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So depending on
the system you have

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and depending on the muscles
that you're interested in,

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really just designing
your study is important.

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But just expect a lot
of trial and error

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before you get a good signal.

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Yep.

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All right.

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[THEME MUSIC]

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