Energetically Optimal Cadence vs. Freely-Chosen Cadence During Cycling : Effect of Exercise Du ration

Abstract : The purpose of this study was to examine the relationship between cadence and oxygen consumption with exercise dura-tian. Ten triathletes who trained regularly were examined. The first test was always a maximal test to determine maximal oxy~ gen uptake (VOzmax). The other sessions were composed of six submaximal tests representing 80% of the maximal power reached with VOzmax (Pmax). During these tests submaximal rides with a duration of 30 min were performed. Each test represented , in a randomised arder, one of the following pedal rates: 50, 65, Bd, 95,110 rpm and a freely-chosen rate. \/0 2 , respiratory parameters, and heart rate were monitored continuously. Two periods, between the 3rd and the 6th minute and between the 25th and the 28th minute, were analysed. Results showed that when \/0 2 and heart rate were plotted against cadence, each curve could be best described by a parabolic function, whatever the period. Furthermore, a significant effect of period was fou nd on energetically optimal cadence (70 ± 4.5 vs. 86 ± 6.2 rpm, P < 0.05). Only during the second period was no significant difference found between freely-chosen cadence (83 ± 6.9 rpm} and energetically optimal cadence (P > 0.05). ln conclusion, our results suggest that during prolonged exercise triathletes choose a cadence that is close to the energetically optimal cadence. A change of muscle fibre recruitment pattern with exercise duration and cadence Would explain the shift in energetically optimal rate towards a higher pedal rate observed at the end of exercise. •
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Christophe Hausswirth, Jeanick Brisswalter, D. Smith, Fabrice Vercruyssen, Jean-Marc Vallier. Energetically Optimal Cadence vs. Freely-Chosen Cadence During Cycling : Effect of Exercise Du ration. International Journal of Sports Medicine, Thieme Publishing, 2000, 21 (1), pp.60 - 64. ⟨hal-01762731⟩

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