The mechanical power (Wtot, W·kg−1) developed during ten revolutions of all-out periods of cycle ergometer exercise (4–9 s) was measured every 5–6 min in six subjects from rest or from a baseline of constant aerobic exercise [50%–80% of maximal oxygen uptake (VO2max)] of 20–40 min duration. The oxygen uptake [VO2 (W·kg−1, 1 ml O2 = 20.9 J)] and venous blood lactate concentration ([la]b, mM) were also measured every 15 s and 2 min, respectively. During the first all-out period, Wtot decreased linearly with the intensity of the priming exercise (Wtot = 11.9−0.25·VO2). After the first all-out period (i greater than 5–6 min), and if the exercise intensity was less than 60% VO2max, Wtot, VO2 and [la]b remained constant until the end of the exercise. For exercise intensities greater than 60% VO2max, VO2 and [la]b showed continuous upward drifts and Wtot continued decreasing. Under these conditions, the rate of decrease of Wtot was linearly related to the rate of increase of V [(d Wtot/dt) (W·kg−1·s−1) = 5.0·10−5 −0.20·(d VO2/dt) (W·kg−1·s−1)] and this was linearly related to the rate of increase of [la]b [(d VO2/dt) (W·kg−1·s−1) = 2.310−4 + 5.910−5·(d [la]b/dt) (mM·s−1)]. These findings would suggest that the decrease of Wtot during the first all-out period was due to the decay of phosphocreatine concentration in the exercising muscles occurring at the onset of exercise and the slow drifts of VO2 (upwards) and of Wtot (downwards) during intense exercise at constant Wtot could be attributed to the continuous accumulation of lactate in the blood (and in the working muscles).
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Capelli, C., Antonutto, G., Zamparo, P. et al. Effects of prolonged cycle ergometer exercise on maximal muscle power and oxygen uptake in humans. Europ. J. Appl. Physiol. 66, 189–195 (1993). https://doi.org/10.1007/BF00235092
- Cycle ergometer exercise
- Maximal power
- Oxygen uptake kinetics