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IAAF Biomechanical Analysis Data

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  • #16
    Originally posted by gh
    Originally posted by Pierre-Jean
    20m split were found via camera aligned with marks on the track. The cameras are linked with the Seiko equipement so they can have accurate and synchronised time code. Laser (blue line) is placed either behind or in front of a single runner, at about 1m-1m20 height. I would rely more on the camera data because it takes the times from the torso, like the final time on photofinish.
    The 0.01-0.02 diff between the 2 methodology confirms what was found in Athens'97.
    Any idea if the 100m splits in the 400s (and 200) are high-speed stuff (usable in 100ths), or interpolations from normal video (only usable in 10ths)?
    Same methodology as for aligned and Seiko-syncronised camera. Same research theam and method as in Stuttgart'93.
    The university in charge of sprint event biomec analysis is not the same as throws and jumps, those events required 3D analysis and thus more time to analyse data..

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    • #17
      Pierre-Jean- Would you mind answering gh's question directly since not all all of us (me included) are familiar with the methodology from Stuttgart? Or is there a link where it can be found?

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      • #18
        Originally posted by JRM
        Originally posted by RamGoat
        The squiggly line is Bolt's actual speed.

        You push off with your legs.. and the air resistance and landing slows you down. So the speed is oscillating as it rises to the 65m mark. That is why his MAX speed is more than the 10m distance divided by the split.
        Air resistance is constant.

        With each [edit] drive phase the torso lurches forward, with each flight/landing the torso jerks backwards. Since the data comes from sensitive laser speed devices, the graph is exactly what one should expect to see.

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        • #19
          Interesting how Bolt seems to have a little rest between 45 and 55m in his 100m final where the power for each stride seems to be less.

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          • #20
            Originally posted by Daisy
            Interesting how Bolt seems to have a little rest between 45 and 55m in his 100m final where the power for each stride seems to be less.
            Where are you seeing 5m data?

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            • #21
              Originally posted by Marlow
              Originally posted by Daisy
              Interesting how Bolt seems to have a little rest between 45 and 55m in his 100m final where the power for each stride seems to be less.
              Where are you seeing 5m data?
              http://tinyurl.com/p2phka

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              • #22
                Originally posted by bhall
                Pierre-Jean- Would you mind answering gh's question directly since not all all of us (me included) are familiar with the methodology from Stuttgart? Or is there a link where it can be found?
                Markers are placed on the track.
                Cameras are placed on upper crowds and aligned with those markers.

                Scheme of the set-up :



                The only diff is that in Stuttgart, the times were taken at 30m, 60m and 80m while in Berlin they were taken at 20m, 40m, 60m and 80m.

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                • #23
                  Originally posted by malmo
                  Originally posted by Marlow
                  Originally posted by Daisy
                  Interesting how Bolt seems to have a little rest between 45 and 55m in his 100m final where the power for each stride seems to be less.
                  Where are you seeing 5m data?
                  http://tinyurl.com/p2phka
                  Thanks. Are are they interpolating the 10m split data? - sure doesn't look like it.

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                  • #24
                    Originally posted by Marlow
                    Originally posted by malmo
                    Originally posted by Marlow
                    Originally posted by Daisy
                    Interesting how Bolt seems to have a little rest between 45 and 55m in his 100m final where the power for each stride seems to be less.
                    Where are you seeing 5m data?
                    http://tinyurl.com/p2phka
                    Thanks. Are are they interpolating the 10m split data? - sure doesn't look like it.
                    10m split data are interpolated from the curve drawn by the laser.
                    You'll find up to 0.02 diff with the camera timings.

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                    • #25
                      Originally posted by JRM

                      What is the origin of the oscillations in the LAVEG data? Is this limb movement (arms, legs)?
                      I believe the jerkiness is due to his body getting jerked around as his legs interact with the ground.

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