LAUSR

What is the central question of this study? The initial increase in oxygen uptake ( V̇O2 ) at exercise onset results from pulmonary perfusion changes secondary to an increased venous return. Breathing mechanics contribute to venous return through abdominal and intrathoracic pressures variation. Can voluntary breathing techniques (abdominal or rib cage breathing) increase venous return and improve V̇O2 at exercise onset? What is the main finding and its importance? Abdominal and rib cage breathing increase venous return and V̇O2 at exercise onset. This mechanism could be clinically relevant in patients with impaired cardiac function limiting oxygen transport.