Twelve weeks of sprint interval training increases peak cardiac output in previously untrained individuals

IntroductionSprint interval training (SIT), characterized by brief bouts of ‘supramaximal’ exercise interspersed with recovery periods, increases peak oxygen uptake (V˙O2peak$${\dot{\text{V}}}{\text{O}}_{2{\text{peak}}} $$) despite a low total exercise volume. Per the Fick principle, increased V˙O2peak$${\dot{\text{V}}}{\text{O}}_{2{\text{peak}}} $$ is attributable to increased peak cardiac output (Q˙peak$${\dot{{Q}}}_{\text{peak}} $$) and/or …