Effects of "priming" exercise on pulmonary O2 uptake and muscle deoxygenation kinetics during heavy-intensity cycle exercise in the supine and upright positions.

We hypothesized that the performance of prior heavy exercise would speed the phase 2 oxygen consumption (VO2) kinetics during subsequent heavy exercise in the supine position (where perfusion pressure might limit muscle O2 supply) but not in the upright position. Eight healthy men (mean +/- SD age 24 +/- 7 yr; body mass 75.0 +/- 5.

Influence of blood donation on O2 uptake on-kinetics, peak O2 uptake and time to exhaustion during severe-intensity cycle exercise in humans.

We hypothesized that the reduction of O2-carrying capacity caused by the withdrawal of approximately 450 ml blood would result in slower phase II O2 uptake (VO2) kinetics, a lower VO2peak and a reduced time to exhaustion during severe-intensity cycle exercise. Eleven healthy subjects (mean +/- S.D.

Pulmonary O2 uptake on-kinetics in rowing and cycle ergometer exercise.

The purpose of this study was to characterise, for the first time, the pulmonary O2 uptake (V(O2)) on-kinetic responses to step transitions to moderate and heavy intensity rowing ergometer exercise, and to compare the responses to those observed during upright cycle ergometer exercise. We hypothesised that the recruitment of a greater muscle mass in rowing ergometer exercise (Row) might limit muscle perfusion and result in slower Phase II V(O2) kinetics compared to cycle exercise (Cyc). Eight healthy males (aged 28+/-5 years) performed a series of step transitions to moderate (90% of the mode-specific gas exchange threshold, GET) and heavy (50% of the difference between the mode-specific GET and V(O2) max) work rates, for both Row and Cyc exercise.