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The beginning: image analysis Sprint Track

In the 100 meters and 200 meters sprint track events, the onset may gain or lose a race. In the 100m winning the difference is often measured in 100ths of a second, so any advantage to be gained at the start can be crucial.

During the week the World Athletics Championships next, Tyson Gay Usain Bolt will be for the title of worlds fastest man. So far in 2009, both athletes have been impressive at times and the first meeting including this year should be fast, close and exciting. Usain Bolt is the Olympic champion and world record holder. We have already discussed how fast he could run. Tyson Gay is the reigning world champion and recently ran the 100 meters in 9.75 seconds at the U.S. Championships.

With both athletes are at the top of their game, the victory can be decided by its beginning. None is known for his explosive or quick starts. Bolt has a long stride length and eats floor with each step, while Gay has beaten leg speed. The start however, is crucial and we have therefore decided to look at some video and examine the principle.

Then frontal shows a video of Tyson Gay in the U.S. Championships. We want to focus on your home.

http://www.youtube.com/watch?v=aECm-dx3WG8

A good start requires the athlete properly configured. Here are some of the key factors for the position set before the starting gun sounds.

1. The hands are installed in line shoulders and upper body should lean forward on your hands. track coaches suggest angle of about 15 degrees (the angle between the shoulders and hands and vertical). Although we can not see the angle that tilts Gay (this would require a side view your home), we can see that it is leaning forward and ready to explode from the blocks.
2. The angle of the knees in the starting position should be allowed the athlete to get away from the blocks with as much energy as possible while at the same time be able to get through your feet to start. The optimal knee bend front should be around 90 degrees to provide greater leverage to produce thrust. The back leg should be bent less than this at about 60 degrees to be able stop halfway hard, but straighten the front leg before and have time to come through the first phase.
3. Both legs should push almost simultaneously at the beginning of the race. The athlete can not sit in any front or back leg at the start.

Tyson Gay set up well and in this video explodes from the blocks, pushing with both legs quickly. Both legs straighten completely, with your back leg, leaving the starting blocks and drive through before your front foot (left leg) is completely straight.

Gay also uses his arms to explode out of the blocks, and to maintain a good balance. Watch as your pulse right arm backward and forward on your left. The move is a new extra forward momentum, but also ensures that as he starts it does not fall to one side. The arms act as a counterweight to the movement of the legs. At the start of the right leg to take the first step on the court and therefore his left arm needs to be transmitted to the balance of this motion.

Moving towards this first step the right foot on the track, we can see that the head and chest are gay down. His arms are pushing hard and fast. If you pause the video you see them as a blur. We can also see that your first step is not too long. In fact, his head chest and hips all remain in front of your foot for this first step. This allows you to remain low in her body. If he went a step further in the first place, it would force your chest up, which in turn slow down. His chest and head down to stay up to 16 measures that allows lean forward during the start and further accelerate.

His technique looks pretty good start here and we do not know what their reaction time to the gun was, we can see that it was able to accelerate right from the start and that is why we support a fast time.

Looking through more videos at boot Tyson Gay, I found one that suggested tttjump Gay Knee rolls forward at the start. If you study the slow movement of the output in the video above you will see what this means. Gay foreleg (left) moves forward and down, in fact leans a little more, just after sunrise and as his hands leave the ground.

The suggestion is that this additional curve front knee on the gun, causing a delay in its ability to lower the blocks. On closer examination, we see that his back foot and driving (correction) as "the knee roll" forward. This may be what causes the foot to give less power to his hind leg of it that there is a need to slow down, to allow time for the right leg to get into position to begin their push.

From the biomechanical point of view, this suggests that the front leg does not bend Gay the optimal position to exploit the blocks. You might bend a little more after the start, pushing to get power. The split second it takes to bend the knee a little more and the small amount of push back the foot of power that can lose, could determine the outcome of the race against a phenomenon as Usain Bolt.

Once again from the point of view of biomechanics, this problem could be solved simply by adjusting output blocks Tyson Gay or position slowly, allowing the knee to establish a more optimal location for its style of game.

Of course, for this World Championship too late to make any changes Tyson Gay and Usain Bolt should provide some really tough competition when hopefully they will meet in the final in Berlin.

About the Author

Dudley Tabakin is Co-Founder of Sadaka, LLC http://videosportsanalysis.blogspot.com, a motion capture and biomechanics consultancy. Clients include FootJoy, Titleist, Warrior Hockey, Vicon Motion Systems, Innovision Systems Inc. and other Sports and Motion capture and biomechanics software companies

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