Yelling!

I was wondering, does it really help to yell, when I throw an opponent in a wrestling or judo match? Could you explain how this works? Would this relate to the same reason, why marines sing while they run? I do it in matches, and it seems to give me an extra push when I throw an opponent.

http://circularstrengthmag.com/forum/viewtopic.php?t=1438

This contains some interesting insight.