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Re: First Day Fun

Postby h.harb » Sat Dec 09, 2017 6:27 pm

I don't want to throw water on the long post by John, but there are many inaccuracies in it. And It doesn't address co-contraction of the hip specifically, which was the question. Co-contraction begins at the base, and happens as a balancing lateral ankle function, also with and in the foot or with the foot's help, less so at the knee, laterally.

The lateral movements of the legs themselves are controlled at the hip/pelvis and femur. This happens while ankle and foot co-contraction are already in process.

To stand up, in daily life, we use co-contraction at the knee (this is the knee flexing/extending function or you would buckle and collapse, but that's not the real crux of the matter here. Hip co-contraction is functioning at multi levels and planes. Even deep internally with the Psoas muscles to keep the torso stable over the pelvis.

Laterally, as with CBing movements it involves the quadratus lumborum, which makes side bending movements of the torso, and spine over the pelvis possible. Then you begin to address the external and internal rotations of the femur, which are the sets of muscles for the amount of rotation and direction. These are for femur rotation about and attached to the top back of the femur and pelvis. Internal rotation and adduction comes out of the adductors. All of these movements and muscle firings happen in conjunction with each other, and they can never all be monitored by a skier in motion arcing down the slope. So this is all academic. It's not as straight forward and obvious when you begin to put the whole process together, then try to apply movement instruction.

That is why we have external movement cues for PMTS and we teach how to move one body part at a time and watch the range of motion to evaluate wether or not the whole system is acting functionally. We have spent countless years developing PMTS, it's movements and how best to convey them. This it's not a thrown together convoluted approach like the one used by PSIA; where only gross muscles and big movements are taught. And almost all of the PSIA movements push or move the body out of balance. I don't have to go further describing this, as all you have to do is watch their demo team compared to others in the world.
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