acc.enable_activity_interrupt() axis?

[ferfersan6]

Hi all!
I am doing an accelerometer condition wake up. My question is:
In what axis is applied the threshold of enable_activity_interrupt?
I made a little try putting acc.enable_activity_interrupt(750, 200), so the threshold should be 750 mG. Resting, the z axis marks 1 G, so the threshold should be crossed and the Pytrack should wake up, but it doesn't. So that is why I am asking myself which axis should surpass the threshold.
Thanks all!