Why do martial arts fighters shout while fighting?

I don't know that there's ever been any scientific explanation, but I know from direct empirical experience that under some circumstances, it is possible for a very short time to exert greater strength if one's effort is accompanied by a loud vocalization. This isn't unique to martial arts, though it seems that many of the martial arts have fine-tuned this principle to a greater degree than is usually found outside of martial arts. I have very little experience with martial arts, but I have found this principle to be quite useful in much more mundane work basically almost any task that requires a very short burst of strength.

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