I was in communication with the Principle Investigator of that study. It was a seminal study 5 years ago with a small subject number as all preliminary studies are. To get the benefits as seen in the trial, the protocol must be followed exactly. Additionally, the P.I. told me that they were doing further research (repetition of results, preferably by another lab) is a must in science. To date, no further research has been done and the investigators have gone on to other topics.
Playing the didg. is fun. I have two. But if you chose to try to treat your apnea this way, you need to keep using your CPAP and measure the effects playing the didgeridoo has had by an objective sleep study.
