Board Thread:WARNING ALL USERS False Info\Spoilers/@comment-87.232.43.106-20131129193418/@comment-25178327-20131203224011

I just said that it's not all about heart rate. There are only three reasons why werewolves shift.

Alphas make them shift against their will

Full moons

Anger/rage

Full moons have absolutley NO connection with heart rate, it just for some reason makes them go out of control. This also applies to Alphas making them go out of conrol and transform (has nothing to do with heart rate).

Anger and rage however, do have a connection with heart rate. It is the anger that causes wolves to transform, the hightened heart rate is a only a result of anger. So the reason why Stiles used the heart beat sensor thingy was to measure Scott's anger levels and teach him to control it.