[xavi]

(09-25-2013 02:31 AM)tfjaguarstrength Wrote:  Xavi,

So, you are saying that in order to measure jump height accurately I will need a camera system as well?

Chronojump is a system that works, cheap, validated and used by lots of people. You don't need anything more. But if you are unsure and you think it doesn't work ok, then one reliable way is to record a jump with Chronojump and a high speed camera. then you will see if there any differences.

(09-25-2013 02:31 AM)tfjaguarstrength Wrote:  If not, then I was wondering why there is such a difference across contact mats (Chronojump and Just Jump). When using both combined with a vertical jump measuring device such as a vertec, there is a considerable difference is estimated jump height (different formulas?). The measure for the Chronojump are consistent among themselves. Sorry to keep going but I am just curious by nature.

Vertec is a different thing, people make a movement with the shoulder in order to arrive higher, but this movement of: "try to reach the top with the hand" produces a high value in Vertec but is not related to a higher jump, just a higher arm extension.

I haven't tried Just Jump and I cannot tell if that works as expected. If you care about the formula, see that Chronojump gives you the flight time and then this is converted to jump height. The formula should be the same on both products.

Here you have the validation of Chronojump tools:

http://www.cafyd.com/REVISTA/ojs/index.p...ad/528/288

Cheers.