Bill Hartman 22:48–25:39
I think what we need to do is look at the relationships of how all of these parts interact to produce expansive and compressive strategies because that's ultimately how we move. Our last question for this week's Q&A comes from Misha. Misha, could you please go over in more detail how the anterior posterior compression of the pelvis restricts hip motion? Absolutely, I can. I'd be happy to. Misha, I would also, before I dive into this with the pelvis, I would say that the exact same process occurs in the thorax. It's really easy to see in the thorax because the distance that the gradients travel in the thorax for the compensatory strategies are just much easier to see. So we got a lot more time per se for these transitional strategies. In the pelvis, the gradients are very, very narrow. So let me show you what I mean. I'm going to grab my pelvis here. So if we look at the front of my pelvis and we look at the pubis here. So there's my pubic synthesis between my two fingers there. And then if I was to look at my sternum, my sternum is that wide. So again, I have more distance to cover with my inhalation, exhalation, gradients. And so what happens in the pelvis is that these transitions occur very, very quickly to the point where they almost seem to be simultaneous. They are occurring simultaneously just to different degrees but again I would encourage you to look at the compensatory strategies as they evolve in the thorax because it's just much easier to see and then just translate that to the pelvis. Since you asked about the pelvis we will go ahead and we will run through that. And so if I am utilizing a compensatory breathing strategy that promotes a compressive force on the front side of the pelvis, what's going to happen is I will lose internal rotation capabilities at the hip. Reason being is, if I compress the front, that means that the volume that comes down in the pelvis will be biased posteriorly, so I get expansion here. Now if you look straight down in the pelvis, and this is a plastic model that doesn't move, the pelvis actually changes shape. When I push more volume into the pelvis, it will change shape. So if I have a compressive strategy here, I get an elongation in this direction of the pelvis. That changes the orientation of the muscle fibers that attach posterior to the trochanter. So what happens is they pick up concentric orientation. So I get eccentric orientation of the front, concentric orientation of the back. And so what happens when I compress the front and expand the back, I pick up ER. and I lose the IR because if I have eccentric orientation here, I have a fluid volume in the front part of the hip joint that I cannot move into. I cannot compress that fluid because I have concentric orientation on the backside. Now, if I reverse gears and I say I have a posterior compressive strategy, which means that I'm going to push the volume into the anterior part of the pelvis, what's going to happen there is I'm going to pick up concentric orientation on the front side of the hip and I'm going to gain internal rotation because on the backside that because of the compressive strategy, Or yeah, because of the compressive strategy here, I changed the shape of the pelvis. So now I get a widening of the pelvis here that increases the length of the muscle fibers on the backside that happen. So now what happens is I have an eccentric orientation here. I have a volume expansion here. And I can't move into that, into extra rotation. And so what happens is I get pushed in this direction by the concentric strategy here, eccentric strategy here. And it turns inward. Typically what you're going to see under most circumstances again because these gradients are occurring very very quickly because they typically present visually and from a measurement standpoint they're going to present from the bottom up okay as I fill up the pelvis like a glass of water with the volume that comes down. You're going to see a lot of these strategies occur simultaneously. So that's why it becomes very, very important for us to distinguish between how much ER and IR capabilities we have. So we know where the compressive strategies are. We know where you're capable of expanding if you are. And then we know what kind of shape change that we have for the pelvis. that we have to intervene with to make the physical changes. So do I need to create more expansion? Do I have to restore the inhalation capabilities of the pelvis? Or do I need to increase the compressive strategy of the pelvis to overcome the limitations that are demonstrated in the hip joint? So hopefully Misha, that answers your question. If I was unclear, then please ask that question again and we will try to go through it again next time. That's all I have from Q&A standpoint for this week. So hopefully you have a great week. Check me out. I shouldn't say check us. I'm the only one here. So check me out on Instagram because I will be there all next week and we'll be throwing up videos on the YouTube channel as well. If you have any special requests as to what you would like to see on YouTube or on Instagram, please throw those up on those platforms as well. Or you get to email me directly at askbillhartman at gmail.com, askbillhartman at gmail.com and I will answer your questions on that platform as well.
pelvic mechanicsrespiratory strategieship motionbreathing compensationcompressive vs expansive strategies