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Thread: walter dix 10.03 UM 2016

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    walter dix 10.03 UM 2016

    race from today. He looks good

  2. #2

    Re: walter dix 10.03 UM 2016

    Good to see him approaching form.

  3. #3

    Re: walter dix 10.03 UM 2016

    He has virtually eliminated all backside mechanics.

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    Re: walter dix 10.03 UM 2016

    Quote Originally Posted by robin1 View Post
    He has virtually eliminated all backside mechanics.
    same thing i was thinking. nasty how he pulled away. My boy that was at the meet said he yelled so loud once he hit max v that the whole stadium heard it. lol

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    Re: walter dix 10.03 UM 2016

    Quote Originally Posted by robin1 View Post
    He has virtually eliminated all backside mechanics.
    Robin1, that's actually not the case. If you look at Dix in slow motion what you see is that he maintains fantastic pelvic position (quite neutral). This then gives the appearance in real time that very little is happening backside (we the same from Powell) when, in fact, they achieve full extension like everyone else. It's just that most other sprinters are exhibiting greater pelvic rotation which exaggerates backside action by way of the angle at which the extension occurs.

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    Re: walter dix 10.03 UM 2016

    Dix 620 x 560 .jpglane 3 620 x 560.jpg

    Here are stills from Dix and the sprinter in Lane 3 at max V. Note the position of the pelvis and the differential in magnitude of forward rotation between Dix and the sprinter in lane 3.

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    Re: walter dix 10.03 UM 2016

    The comparison of the two of them reveals the illusion in both backside as well as front side leg mechanics. If you notice the sprinter in lane 3, his knee lift is as significant as Dix's in terms of hip flexion. The difference is that Dix's pelvis is neutral thus we are seeing ~90 degrees of hip flexion which aligns parallel with the X axis of the ground. This, particularly in real time, gives the illusion of "high knees".

    Meanwhile, sprinter in lane 3 is also flexed to ~90 at the hip, however, his forward pelvic rotation presents the illusion that his hip is not flexed as much as Dix due to the acute angle between his pelvis and the X axis.

    Take note coaches who are cueing knee lift without taking notice of the position of the pelvis; as optimizing pelvic neutrality will enhance "knee lift", and mitigate kicking out the back, by default.

  8. #8

    Re: walter dix 10.03 UM 2016

    Thanks James for the nice analysis. What I meant is that his hip hardly extends (his thigh is in line with his trunk at his maximal point of hip extension) and his knees do not fully extend at the back either. You can see these two things in the picture you shared. I agree that much of this has to do with pelvic positioning. Asafa, Michael Frater, James Dasaolu (when he was in good shape, ie. his 9.91) are doing something very similar, and its working well, so I wasn't criticising but rather sharing an observation. In fact, after seeing this I decided to try and go back to running more like this again after having tried to increase my hip extension in the past in an effort to lengthen my stride. The result seems to have been longer foot contacts with little or no gains in stride length.

  9. #9

    Re: walter dix 10.03 UM 2016

    sprints.jpg

    This is me at full hip extension 9 years ago (right) vs. 1.5 years ago (left). Plan is to go back to running more like I did back then.

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    Re: walter dix 10.03 UM 2016

    Robin1, correct in that extension for those in a position of neutral pelvic alignment occurs closer to the Y axis. This is, in fact, because of the position of the pelvis and what we "should" see from all sprinters in the upright position.

    Here's another one of Dix where we see the most extension occurring "underneath" him as opposed to behind him. Dix 3.jpg

    Similarly, in early acceleration out of the blocks the angle of extension, while acute with respect to the X axis, should be similar as in the upright position as the relationship between the pelvis and torso should be consistent throughout.

    Regarding your photos, well stated as it is clear that the more recent photo illustrates a longer ground contact patch.

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