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We learned a lot of muscles now we got
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to figure out how all of this stuff
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works together and where we're going to
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go with it as far as exercise selection
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so human movements science rule number
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one all systems will be involved in
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human movement muscular skeletal neural
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and fascial every once awhile I given
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this these arguments about well is that
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a fascial problem a muscular problem or
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an articular problem yes right all these
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systems work together they can't be
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divided out you guys know the rules of
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the human you already know the rules of
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the skeletal system we talked about that
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yesterday when we start talking about
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arthrokinematics and joints you start
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going a little deeper than we did
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yesterday it's not just bone to bone you
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start realizing that the shape of each
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of those bones and how they meet they
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capsule around that joint the ligaments
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cartilage synovial brum membrane
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articular discs bursa and those
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ligaments we talked about yesterday all
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affect how that joint moves the more
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knowledge you have about all those
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things the more you can potentially
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affect now yesterday we talked about
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osteokinematic motion this is just
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vocabulary guys osteokinematic motions
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are large joint motions motions of bones
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and we name osteokinematic
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motions flexion extension rotation you
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guys already know this stuff you just
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didn't know that those are osteokinematic
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motions arthrokinematic
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motions are small amplitude movements
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that happen between joint surfaces
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also not particularly complicated
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there's spin glide roll compression and
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distraction now in order to visualize
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these arthrokinematic motions all you
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really have to do is think of a cue ball
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on a pool table guys with me roll
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there's my table right if I told you to
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roll the ball what would you do it roll
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right and move in that direction arthrokinematic
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roll same thing if i told
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you to spin the cue ball what would you
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do yes you spin it like a top right so
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if this is the top of my table but I'm
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looking down at the cue ball how would I
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spin it how would it spin sure I could spin
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this way that's all spin is if I told
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you to glide the cue ball yeah you do
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that little like push thing with no spin
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or roll right so you just kind of shove
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it that way slide along the table if I
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told you to compress the cue ball you
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just mash it you just mash it into the
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table it probably wouldn't get very far
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but you'd mash it into the table and
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distraction what's distraction or
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traction yeah you just pull it away from
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the table now these are arthrokinematic
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motions do become very important when we
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start talking about joint motion because
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these things have to happen a certain
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amount together
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let's go back to the shoulder this is my
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glenoid fossa we're going to say this is
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my humeral head with my humerus
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sticking out we'll say this is a
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top-down view you guys cool with that
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what joint action would this be then
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horizontal adduction right I'm sorry
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just big joint action osteokinematic
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motion this would be horizontal
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adduction right we'll say we're talking
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about a bench press we're doing this
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right you guys can pretend that this is
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the elbow and then I have a ginormous
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400 pounds on this of course we're
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talking about my bench yeah so as I go
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into horizontal adduction what is my
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humeral head going to do it's going to
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roll right it's going to roll that's
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what it's going to do but what happens
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if he keeps rolling it's gonna fall out
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of the glenoid fossa not a great thing
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while you're doing bench press so what
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is my shoulder joint also have to do how
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is it going to stay centered in this
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joint it's got a glide and you're
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absolutely right to stabilize against
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that much load my rotator cuff might
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come in and compress to stabilize you
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guys going to see how that works
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together that's it that's arthrokinematics
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that's all it is it's just
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looking at these terms to see how we're
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going to keep a joint centered against
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another bone
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not terribly complicated right I think
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people like to try to make this
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complicated it's not that the problem
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can I erase this that looks fancy one of
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my better diagrams I think