Thank you for answering my question! I have no intention of doing this type of training. A friend of mine is doing it and posted a picture of himself on facebook doing occluded bicep curls. It got a fairly large response and that made me nervous. It is my understanding that anytime you occlude blood flow, the risk of developing a clot increases and I certainly would hate to see my friend or his clients have anything bad happen. I just could not find a lot of research on the subject.