The degree to which the CardOut vs. V? o dos relationship is nonlinear has not been rigorously investigated. In addition to knowing the relative frequency of finding a nonlinear relationship in the general population, it would be interesting to see whether nonlinearity might be associated with relative fitness (e.g., V? o 2 max/kg). One could argue that, as relative fitness level increases, the ability of the heart to increase stroke volume (SV) at higher levels of exercise might become limited as filling time per unit of venous return is reduced.
2 in a group of healthy individuals, not selected for athleticism but covering a range of fitness levels. We sought to answer several specific questions: 1) in what proportion of individuals is there a statistically significant curvature in the CardOut vs. V? o 2 relationship? 2) Is curvature of CardOut vs. V? o 2 max related to fitness level as indicated by V? o 2 max/kg or other subject characteristics? The purpose of the study focused solely on the CardOut vs. V? o 2 relationship and its relationship to fitness level. Although, as pointed out above, negative curvature in the CardOut vs. V? o 2 relationship might indicate a kind of cardiac limitation to exercise, determining the overall integrated determinants of V? o 2 maximum, which could include limitations in any component of the O2 transport or utilization chain (20), is not an end point of this study. To answer these questions, how to see who likes you on dil mil without paying we utilized an open-circuit acetylene uptake method to measure CardOut (9). Sigue leyendo