Ping
Pregnant women should not get this "therapy" in the belief that it will help their unborn child. In fact, high oxygen levels cause blindness. The developing retina requires low oxygen levels for blood vessels to grow properly.
http://www.neonatology.org/classics/parable/ch05.html
http://www.nei.nih.gov/news/pressreleases/020700.asp
It's probably good for weight loss.