adding some power (not all of it!)
In an Airbus the thrust levers have to go to the TOGA position to cycle through to the Go Around phase of predictions and to string together the track or nav required after the GA. They do not have to remain in that position. So yes full power has to be, at least briefly, selected.
I understand from a recent company problem that Boeing have a requirement for something not dissimilar (but not the same.)