Kinetics of O2 in professional cyclists

22 cyclists, comprising 12 professional cyclists (mean age 25 +/- 1 yr) and 10 well-trained amateur cyclists (mean age 22 +/- 1 y).

Ramp cycle ergometer test until exhaustion (power output increases of 25 watts x min(-1)).

Well-trained amateur cyclists performing the same ramp cycle ergometer test.

Kinetics of oxygen uptake (VO2) and regression lines of the VO2:power output (W) relationship across three phases: phase I (below lactate threshold), phase II (between LT and respiratory compensation point), and phase III (above RCP).surrogate