Nope. The weapon determines that. It's what kinda makes things effy. A ratonga hits for the same amount as an ogre, but lands more hits and gets hit less often(ALOT less). As I've yet to ever run out of power during a fight with any fighter I've ever played(including ratonga, erudite, dark elf, and gnome) I ASSUME that combat arts start to really drain power later down the line.
STR = weight capacity, power for fighters, and I THINK(not sure) the damage of combat arts. I'm fairly certain my kerra scouts' combat arts did alittle more damage than the ratonga, but I'm not sure. Even so it did it couldn't compensate for the ratonga's accuracy with regular attacks.