[mingabunga]

Running on a treadmill (as in this experiment) is quite different from running on an all weather track as sprinters do. I wouldn't be surprised if they got quite different results if somehow they were able to measure this on a non-moving track.

[reubenmorais]

I can't see how it'd make any difference for this experiment. They were measuring ground forces applied by the runners and how fast those forces are applied, so unless the all weather track has artificial gravity…