tkaberna - 07 June 2008 09:14 AM
Maybe it depends on the style of the sprinter as well. I looked at both of those videos and the guy you say has an active foot at contact is more of a pull style sprinter. The other guy doesnt open up in his running with a B-skip action thus is more of a pusher. Looks like if you are a pull type sprinter you pull at the board? Push type relies more on a passive takeoff? Also, in the US they do teach a low foot carriage on the final step, at least in the level II jumps course they did.
You are right. Look at Saladino. He runs with lower knees, low foot carriage at take off. His foot doesnt seem to swing far back on the last step, little pulling action.
http://www.youtube.com/watch?v=dphvUrjKM_Y
He also seems to run taller than the average howe.
Look in this video, yago lamela also does the pull action with high foot on last step. He also seems to run in a more pulling way. He also doesn´t create big vertical forces while running. In the same video pedroso appears, who seems to run taller. He swings his take off far back, recovers foot in a relatively low way but does the pull action. Huge jump for him.
http://www.youtube.com/watch?v=0LDAbUCP1xo
In this video, robert crowther (australia) runs really tall, he doesnt seem to be a pull type sprinter. Low foot recovery but seems to have some pulling action at take off (and this is his best jump ever in that moment). He also extends the free leg far away, even though he uses the hang.
http://www.youtube.com/watch?v=XsmFlYLUJug
In this video, emmiyan´s 886. Runs really tall, low foot recovery but far back swing. I cant decide wether there is an active pulling action or not. Probably yes but not very noticeable.
http://www.youtube.com/watch?v=ykekeh90IXg&feature=related
Here are two more examples of high knee (pulling) runners, little penultimate and very marked active pulling at the board.
http://www.youtube.com/watch?v=6c6r8j-HOpU (gable garenamotse)
http://www.youtube.com/watch?v=UaEq8ZKjT58 (mokoena)
http://www.youtube.com/watch?v=SGal9kBTafM (mokoena)
Saladino deceives me the most, he runs tall, has low foot recovery with little amplitude of movement of take off foot and almost no pulling yet jumps that far.
It seems to me that the best looks like a mixture of tall running, big amplitude of movement of take off foot.
If the recovery is low and the amplitude is big then there inevitabily gonna a pulling action, although it also looks as if the cog just moves arround a very stiff leg which acts as a pole (what dbandre stated before i guess). It seems to me that those who recover their foot lower have less active pulling.
As it has been stated, the very noticeable pulling action is more viewable in those who are the pull-type sprinters. Perhaps because it doesn´t break abruptely the running rythm and amplitude to which the jumper is used to. Their penultimate also doesn´t seem to be very marked as a consequence of the lower running.
Everybody seems to pull actively in a way, some more than others. We can´t polarize and say you have to pull or not.