The companies that make the best rebounders would have the most complete collection of research articles on this subject. The last I looked was about 15 years ago. There are excellent references contained therein. Let us know what you learn. They are just the ones we notice.
Awareness is the first step in resolution.
I've found it helpful in my never-ending stuggle to practice skilled relaxation. I have searched out quite a few meditation pages, but have rarely returned to one. This one will be an exception. As one who has taught skilled relaxation for a long time, it is helpful to have reliable resources to share with my clients. It is also beneficial to me as well.