I was wondering if anyone has experience using the Buteyko method as part of their training. I have read about it being used to help overcome asthma and other respiratory difficulties but was curious how it would affect a completely healthy athlete. I’m a 24 yr old age grouper and collegiate competitor for my university and noticed when at race pace I tended to become dizzy/lightheaded especially during the run. It was actually looking at a finishers photo that I noticed my gaping mouth and wondered if my breathing was affecting performance. From what I’ve read thus far it seems like this could definitely be the case though I haven’t really been able to find any case studies done on athletes. Any thoughts/experience would be greatly appreciated as I’m forever looking to step up my game 
I’m not sure its exactly Buteyko, but definitely informed by/related to it. Patrick McKeown has a new book coming out called The Oxygen Athlete (http://oxyathlete.com/books/). I read some of an early draft and it seems to be what you’re looking for, and is well supported with citations. Actually, I see now that he has posted the citations from the chapters on the website (http://oxyathlete.com/the-science/).
I had severe asthma for years and finally had enough so tried buteyko for the 3rd time. This time it worked. It has reduced my asthma by about 90% and I my CP ranges from 20-35. The big thing is control your breathing and follow the small things like slowing your breathing down during an attack and only breathing out of the nose until the HR goes to 140+. Taping your mouth shut while you sleep works well if you breathe out of your mouth. A lot of ST’ers will probably think I’m a quack but it works.
I used Patrick McKeown’s ebook and video set. Good luck.
Is your concern asthma or dizziness? If the latter, inhale deeper & slower. Activate more your diaphragm and importantly, relax abs. Train to control the mechanics of your breathing. Unless you have exercise-associated asthma (or other Obstructive airways), the lungs do not limit oxygen intake.