I would too, like to see a study done.
I used to have fairly sever back pain and was seeing a Chiropractor 1-3 time a week for 18 months 5 years ago. The pain was in my lower back. Come to find out I had or have a compression fracture said to be from osteoporosis. The pain would range from 5-10 continuously. Three years ago I took up recumbent bike riding. I've had many bent bikes, all with about the same seat recline 25-29 degrees. It seemed the more I rode, the better I started to feel, so the more I would ride. Today I can say the lower back is completely gone, I've been pain free for a couple of years now.
This is why I named my Silvio "Dr. Silvio, MD" !!