Role of lower intensity part of exercise on linearity between oxygen uptake and work rate during incremental exercise in ramp function

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The oxygen uptake (VO_2) response to ramp-fashion loading of cycle ergometer shows linearity to work rate (WR), although additional VO_2 is observed during high-intensity exercise of step protocol. This additional VO_2 is reportedly reduced by prior exercise. We tested the hypothesis that the existence of the initial half of ramp exercise, which is assumed as prior exercise, affects the VO_2 in the high-intensity part of ramp exercise to bring the linearity. Seven males (24+3 yrs, 174+5 cm, 66+5 kg) performed two bouts of incremental ramp exercise (1W increase every 6-second). In the control trial, the exercise started from 0 W, while in the experimental trial, it started from the work rate (range: 112-200 W) corresponding to the individual ventilatory threshold (Tvent). Breath-by-breath VO_2 was measured in two repetitions for each trial. The VO_2-WR relationship was calculated from the data above Tvent, using the same work rate range in each subject. A regression analysis revealed that the slope of VO_2 to a given WR was significantly steeper in the experimental trial than in the control trial (VO_2 (ml/min) =10.7 WR (W) + 382 in control; VO_2 = 11.9 WR +244 in experimental; p<0.05). Result implies that the warm-up-like effect of. the initial ramp half reduces the slow component of VO_2, consequently responsible for the linear increase in VO_2 during incremental ramp exercise.
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