i went through a hb cycle a long time ago...it was actually a random occurance. i went diving and my tank had a problem...as a result i came up to quickly and ended up with the bends. they stuck me in a tank to balance the oxygen in my blood and the funny thing we noticed was the fact that the rsd in my leg seemed to improve a little with each round. at the time they thought it was just a bonus to balance out my out of wack body, but now a days research has shown that forcing high level o2 into areas affected by rsd results in improvements. i think it has something to do with the fact that the damage caused by rsd effects the circulation (thus the temp differentials), and the more o2 causes improvement.