Originally Posted by Jamt
Sorry to say but I don't like that part of ultimate skiing at all. The force on the ski boot causes torque on the ski boot, not the ankle. I may have a totally relaxed ankle and oppose the torque with muscles higher up. For the ski boot to be in balance the forces need to balance but the snow doesn't care if the opposing forces come from under the foot or higher up in the shaft. The snow doesn't care what causes the boot to be in balance or have the appropriate platform angle.
'There are other reasons why tipping the foot joint is a very good idea, but it has little to do with what Ron says.
This conversation is very interesting, and I'm not trying to add fuel to the fire......
I have been helping with a research project the past few years with a Phd in Anatomical Physics, his nickname is Doc.(not very original I know) Doc has opened my eyes to a lot of things about skiing, in which I had not thought of. He has worked with various sports from pole vaulting, wrestling, running, football, etc. (he taught me why the stiff arm works so well in football, and it's the same reason a boxer needs to land the jab).
I am still far from the overall expert the best technique, but I do have 30 plus years of race or coaching experience at what most would consider to be a very high level. Doc's premiss is that the best athletes in any sport will already be doing 95% or more of the movements in the best way possible for the human body to perform those tasks when looked at in terms of energy exerted, and anatomical alignment (aka strongest body alignment position or movement).
We did a lot of testing, and you claim that your ankle is totally relaxed, and you oppose the torque with muscles higher up. What muscles move your foot around your ankle joint? They are all higher up. In addition you are flexing your boot forward (the way it was designed, the muscles higher up in your leg are causing your ankle to flex, push back, etc...). During turn initiation the Anterior Tibial, the Peroneal Tibial, Peroneous Brevis and the Flexors (Digitorum Longus, and Hallucis Longus) were all under very heavy use when we looked at 6 different NorAm Cup racers. They were even used but to much less of an effort in the 6 skiers we tested that were level ii or level iii, we did see a correlation of the more advanced skiers using these muscles more, than those who were closer to the beginner stages. The findings (which will be published in the next 6 to 10 months) show significant use of the ankle in skiing, the boot does not remove the use of the ankle, but it merely stabilizes it.
In on tight hard turns the less skilled tend to use their body mass moving forward to get force onto the shovel of the ski, while advanced skiers are flexing the ankle and driving flexors very hard while the body mass remains in a more stationary place.
Don't ask me the name brand of the equipment used (I didn't help put the sensors on, and I was only their to assist on the hill to set up turn paths, and instruct the participants in what we wanted them to do on the slope). In a nutshell though, it measure the electrical output to the different muscles while the skiers did different activities. The results proved the boot is merely a support for the foot, ankle, and lower leg, but we are using forces on the foot and not as relaxed as I would have thought before, or have been told to try and be. The US Ski Team did issue a grant to support this study, fyi and all of the Nor-Am Cup racers were on the D-Team.
The biggest thing that I learned though was the relationship of ankle to knee to hip to shoulder, and if you become out of the correct alignment, you become very weak, and will not be efficient in your skiing. I have asked for some diagrams from Doc, I don't know if he will share them with me yet or not. I am enjoying reading all of the different thoughts on this subject of over angulation, but at the same time wondering if we should start one about alignment.
Thanks to everyone contributing for keeping me intrigued and my mind occupied.