For anyone interested in inversion weight training I will make the following suggestions.
Spend time just hanging in the inverted postion for a week or two. Rapid internal changes will take a little time to get used to. Invest time in mounting and dismounting the machine. This is how I adjusted to the quick blood pressure changes which occur when standing up from the inverted postion. Workout slowly and carefully. Pay atttention to any changes in consciousness. At the first sign of dizziness stop and dismount the machine. After you dismount hold on to the machine to keep your balance until you feel oriented again. Your ability to reorient quickly will improve as you get used to the exercises.
My idea behind inversion weight training is simply an extreme attempt at muscle confusion. But it works. I consistently experience muscle soreness after I do inversion weight training exercises. I always use light weight when doing inversion exercises. My consistent ablily to get sore from using light weight when doing inversion exercises is how I guage the potential of this type of training. I consider inversion weight training a valuable, though certainly unusual, way of introducing muscle confusion. It is a great method for shocking the system when progress has stalled.
All of this is theory, of course. I could be doing nothing more than creating the slow on-set of mental retardation by weightlifting in an inverted position. But somebody has to volunteer to be the lab rat in the name of expanding our fitness horizons. It might as well be me.