Restrictive Breathing Mask Reduces Repetitions to Failure During a Session of Lower-Body Resistance Exercise. Andre, Thomas L.; Gann, Joshua J.; Hwang, Paul S.; Ziperman, Emily; Magnussen, Marshall J.; Willoughby, Darryn S. The Journal of Strength & Conditioning Research: August 2018 - Volume 32 - Issue 8 - p 2103–2108doi: 10.1519/JSC.0000000000002648