SPEAKER_09 11:56–14:28
Not only does this reduce power output, but it's going to slow me down. And so we have to attend to this anti-orientation. Good morning. Happy Tuesday. I have neuro-coffee in hand, and it is perfect. All right. Man, busy Tuesday. Got to dig straight into today's Q&A, which is dealing with the influence of an anterior-oriented pelvis on change of direction. And so I'm going to show you a clip that's associated with how this influences a baseball pitcher's ability to change direction as they push off the rubber. But we can also apply this to any athlete that has to perform some form change of direction. So if we had a soccer player, a court sport player of any kind, where they have to do some cutting, this is going to be a similar influence. And this is in regards to the influence of an anti-orientation. So remember, the way we're going to identify anti-orientation is the entire pelvis is moving as a unit into its anti-orientation. This is to create an IR force downward into the ground, but we're also going to sacrifice external rotation, ranges of motion in the hip. The other byproduct of this, and this is the part that's probably a bigger influence, is that I'm going to move the center of gravity forward very, very quickly. So if we were looking at a foot, remember as I get this ankle rocker element, as I'm pushing force down into the ground, this is my IR force into the ground, if I anteriorly orient the pelvis above the foot, what I'm going to see is I'm going to see this tibia translate very, very quickly. So what's going to happen, I'm going to move towards max P very, very quickly, and I'm going to lose my heel contact. My center of gravity is going to be moving forward really quickly over the foot. As far as a sprinter, I wouldn't be so concerned about this because they're going to try to translate themselves forward in this direction. But if I'm going to change direction, which is perpendicular to this orientation of the foot, what's going to happen is I'm translating so quickly in one direction that I have to create a delay strategy by lifting up the heel, moving towards ER. So I'm going to go upwards first. I'm literally going to be lifting my center of gravity up to slow down in that forward direction before I change direction. And then we get this little hop off of the forefoot as I'm sort of pivoting off of that forefoot. So not only does this reduce power output but it's going to slow me down and so we have to attend to this anti-orientation. So from a strategy standpoint there's any number of ways that we're going to be able to posteriorly orient this pelvis.
pelvic orientationchange of directionbiomechanicstibia translationcenter of gravity