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Different plantar pressures in skiing

Discussion in 'Biomechanics, Sports and Foot orthoses' started by NewsBot, Jan 7, 2016.

  1. NewsBot

    NewsBot The Admin that posts the news.

    Articles:
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  2. NewsBot

    NewsBot The Admin that posts the news.

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  3. efuller

    efuller MVP

    The guy may know his skiiing, but he doesn't know his physics. We had the following discussion



     
  4. He wants to be "The Boss" of his own website, Eric. He will likely soon stop publishing your replies and your points about the inaccuracies of his statements.

    I did have to chuckle, though, when he told you to read Inman...... classic!.;)
     
  5. NewsBot

    NewsBot The Admin that posts the news.

    Articles:
    1
  6. NewsBot

    NewsBot The Admin that posts the news.

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  7. NewsBot

    NewsBot The Admin that posts the news.

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  8. Linchpin5

    Linchpin5 Member

    Postural responses utilize GRF. So where is the ground when the foot is on a platform with GRF on either the medial or lateral border? Let's start by framing the context in Newton's Laws. Then we can have the basis for a meaningful dialogue.
     
  9. efuller

    efuller MVP

    I'm not sure what you mean by postural responses.
    I'm not sure what you are asking "So where is the ground when the foot is on a platform... "

    I agree that this discussion should use Newton's Laws. A good place to apply them is in a free body diagram.

    Are you familiar with the concept of center of pressure? It is essentially the average point of force and Ground reaction force can be considered to be acting at the center of pressure.


    Linchpin5, are you related to the author of that piece that I quoted?

    Eric Fuller, DPM
     
  10. terigreen

    terigreen Active Member


    Ski Orthotics and Ski Biomechanics: The typical down hill skier's lower extremities never goes through a complete gait cycle. They ideally should have limited pedal mechanics between midstance and the beginning of propulsion, with the knee in flexion during the entire contact phase. When initiating a turn a skier will maintain their control by directing the downhill knee medially and transferring the load into the foot over the inside edge. This is done by internally rotating their tibia, causing a closed kinetic chain pronation of the foot, which transfers the pressure through the boot onto the ski edge. In ski boots subtalar joint supination and pronation are responding to knee function. With ski orthotics the goal is to control the knee function by supporting the foot anatomy. A custom heat moldable ski orthotic from Atlas Biomechanics, allow the skier to turn quicker and with more power. The skier will have a more efficient transfer of energy and will have decreased overall foot and knee fatigue. A ski orthotic from can make you a better skier. Teri Green, www.atlasbiomechanics.com
     
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