[xavi]

(09-27-2013 06:18 PM)xavi Wrote:  

(09-27-2013 06:40 AM)trener Wrote:  Hello Xavi and everybody,

I have the same question. I tried to do some jump tests and the results was a far away lower than real. I recorded jumps with camera and it was obvious. I don't talk about 1 or 2 cm difference, it's more like 10 or 15 cm! I don't know what to do, can you help me?

Best regards

Hello

What are you exactly measuring?

Note that the measurement is related to the center of gravity. Then if you measure the height of the foot or the height of the head, the body has to be fully extended (and the foot also), in the same way that it is when your toes leave the floor. If you want you can attach pictures of the body fully extended just when leaving the floor and in the air (in maximal height situation).

Thanks

Another way is measure time counting the frames in the high speed camera. You need fully extension on jump and on landing, for this reason is good to do a bounce when you are landing as this helps to land in full extension.

Assuming you have done it correctly, then you will have the flight time, and the height of center of gravity in centimeters will be:

height = 100* 4.9 * (flighttime / 2) ^2

Bye