This is something I have found interesting also. From what I have experienced, when I am about to get into a fight with someone at first I feel shakey and everything, the main thing I have noticed is that I would start to shake mainly my hands and my legs feel a little like jello. The part that confuses me though is that useually this is short and once I get past that I have a very calm and cool feeling.
For example, as things start to get harry like when your not sure if there is a problem or you are agruing with someone then I feel the trembling and so forth. But after this initial contact and if things get to the point of fighting I get a really calm feeling like I am in control of the situation, is this normal?
Something else that is weird is that you can get a AD dump even when you are not in a physical confrontation. One time I had a seriouse fight over the phone with a person I did not know too well and I was shaking, I was so ****ed off I could have crippled the person if I had the chance and would have felt good about it.