Did you try using the search function to really dig in the archives? A quick search turned up this thread.. http://www.aikiweb.com/forums/showth...ght=adrenaline
And maybe not what your thinking of, and kind of the yin to your yang...
many martial arts stress meditation like training for stilling, calming, clearing the mind to be better prepared for high adrenal situations. I dont know how many practitioners really take the mind practice seriously, but it seems pretty universal that real martial artists stress it.
maybe meditation is the practice, and your high stress training is the safe test track to test drive it.