Effect of breathing rate on oxygen saturation and exercise performance in chronic heart failure
Bernardi L, Spadacini G, Bellwon J, Hajric R, Roskamm H, Frey AW. Effect of breathing rate on oxygen saturation and exercise performance in chronic heart failure. Lancet. 1998;351(9112):1308-1311. doi:10.1016/S0140-6736(97)10341-5