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1 Department of Exercise and Sport Science, Manchester Metropolitan University, Alsager, Cheshire, United Kingdom
2 Department of Sport and Exercise Science, University of Wales, Aberystwyth, Wales, United Kingdom
3 School of Sport, Exercise and Leisure, University of Surrey Roehampton, London, United Kingdom
* To whom correspondence should be addressed. E-mail: a.m.jones{at}mmu.ac.uk.
We hypothesised that a higher pedal rate (assumed to result in a greater proportional contribution of type II motor units) would be associated with an increased amplitude of the VO2 slow component during heavy cycle exercise. Ten subjects (mean ± S.D. age 26 ± 4 years, body mass 71.5 ± 7.9 kg) completed a series of square-wave transitions to heavy exercise at pedal rates of 35, 75, and 115 rev.min-1. The exercise power output was set at 50% of the difference between the pedal rate specific ventilatory threshold and VO2 peak, and the baseline power output was adjusted to account for differences in the O2 cost of unloaded pedalling. The gain of the VO2 primary component was significantly higher at 35 rev.min-1 compared to 75 and 115 rev.min-1 (mean ± SEM 10.6 ± 0.3, 9.5 ± 0.2, and 8.9 ± 0.4 mL.min-1.W-1 respectively; P<0.05). The amplitude of the VO2 slow component was significantly greater at 115 rev.min-1 (328 ± 29 mL.min-1) compared to 35 rev.min-1 (109 ± 30 mL.min-1) and 75 rev.min-1 (202 ± 38 mL.min-1), (P<0.05). There were no significant differences in the time constants or time delays associated with the primary and slow components across the pedal rates. The change in blood [lactate] was significantly greater at 115 rev.min-1 (3.7 ± 0.2 mM) and 75 rev.min-1 (2.8 ± 0.3 mM) compared to 35 rev.min-1 (1.7 ± 0.4 mM), (P<0.05). These data indicate that pedal rate influences oxygen uptake kinetics during heavy exercise at the same relative intensity, presumably by altering motor unit recruitment patterns.
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