Journal of Applied Physiology AJP: Regulatory, Integrative and Comparative Physiology
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J Appl Physiol 94: 1501-1507, 2003. First published December 20, 2002; doi:10.1152/japplphysiol.00456.2002
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Vol. 94, Issue 4, 1501-1507, April 2003

Effect of pedal rate on primary and slow-component oxygen uptake responses during heavy-cycle exercise

Jamie S. M. Pringle1, Jonathan H. Doust2, Helen Carter3, Keith Tolfrey1, and Andrew M. Jones1

1 Department of Exercise and Sport Science, Manchester Metropolitan University, Alsager ST7 2HL; 2 Department of Sport Science, University of Wales, Aberystwyth, Ceredigion SY23 2AX; and 3 School of Sport, Exercise and Leisure, University of Surrey, Roehampton, London SW15 3SN, United Kingdom

We hypothesized 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 O2 uptake (VO2) slow component during heavy-cycle exercise. Ten subjects (mean ± SD, age 26 ± 4 yr, 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 rpm. The exercise power output was set at 50% of the difference between the pedal rate-specific ventilatory threshold and peak VO2, and the baseline power output was adjusted to account for differences in the O2 cost of unloaded pedaling. The gain of the VO2 primary component was significantly higher at 35 rpm compared with 75 and 115 rpm (mean ± SE, 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 rpm (328 ± 29 ml/min) compared with 35 rpm (109 ± 30 ml/min) and 75 rpm (202 ± 38 ml/min) (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 concentration was significantly greater at 115 rpm (3.7 ± 0.2 mM) and 75 rpm (2.8 ± 0.3 mM) compared with 35 rpm (1.7 ± 0.4 mM) (P < 0.05). These data indicate that pedal rate influences VO2 kinetics during heavy exercise at the same relative intensity, presumably by altering motor unit recruitment patterns.

energetics; muscle efficiency; respiratory kinetics


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