200 Metres Start: Carl Lewis

    Posted In: Article Discussion

        • Keymaster
          Mike Young on January 9, 2008 at 11:57 am #14255

          Read the Article here, and discuss it below.

          ELITETRACK Founder

        • Participant
          JeremyRichmond on April 15, 2008 at 5:39 pm #69383

          Does anyone know the time lapse between each frame?

          Also, if anyone knows the length of Carl’s legs I’d appreciate it.

          Better still if you have any kinematic data of Carl at any point in a race i.e angular velocity of the thigh, angle of legs at impact etc. Strange questions but I’m working on a project.
          Cheers

        • Keymaster
          Mike Young on April 18, 2008 at 7:14 am #69416

          I’m not sure what the time frame was between frames. If it’s anything like film analyses I have done in the past it probably isn’t regular.

          I do however believe the video was shot at 100 fps however I could be wrong.

          To the best of my knowledge no quantitative kinematic analysis was ever performed on this video.

          ELITETRACK Founder

        • Participant
          JeremyRichmond on April 18, 2008 at 9:56 am #69419

          Thanks. I’ll start at 100fps. That will give me a great start. Now I’ve got to compile equations of motion for all the individual segments. Should be finished in about a year.
          Cheers

        • Keymaster
          Mike Young on April 25, 2008 at 6:08 pm #69497

          Please keep us updated. Also, what exactly are you studying and what / who is your subject pool?

          ELITETRACK Founder

        • Participant
          JeremyRichmond on April 27, 2008 at 5:38 pm #69517

          At this point I’m just trying to determine the velocity of the first and second steps. I’m trying to estimate how much velocity is lost during the first and second steps. Coh (2006) recorded an elite sprinter who lost about 50% of the velocity prior to landing, during the braking phase of the first step. However, the data shows that there was minimal loss during the second step although they discuss that 45% is lost during the braking phase of the second step. The sprinter in the study by Coh (2006) used a medium type start. Within the limitations of my measurements from the photos referring to Carl Lewis, I’m estimating a loss of 28% in the first step and 9% in the second (R2=0.76). There is not much data out there on these areas of sprinting. Makes me think I should start analysing something else like the discus or javelin (not the shot put). 😉

        • Keymaster
          Mike Young on April 27, 2008 at 8:26 pm #69519

          At this point I’m just trying to determine the velocity of the first and second steps. I’m trying to estimate how much velocity is lost during the first and second steps. Coh (2006) recorded an elite sprinter who lost about 50% of the velocity prior to landing, during the braking phase of the first step. However, the data shows that there was minimal loss during the second step although they discuss that 45% is lost during the braking phase of the second step. The sprinter in the study by Coh (2006) used a medium type start. Within the limitations of my measurements from the photos referring to Carl Lewis, I’m estimating a loss of 28% in the first step and 9% in the second (R2=0.76). There is not much data out there on these areas of sprinting. Makes me think I should start analysing something else like the discus or javelin (not the shot put). 😉

          Ralph Mann is conducting an extensive research project on the acceleration of elite sprinters in 2 months. This will be research grade data using the fastest sprinters in the world. Results should be available in 4-5 months…..although likely not in a peer-reviewed journal as Dr. Mann no longer goes this route.

          ELITETRACK Founder

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