The rotor pedaling system improves anaerobic but not aerobic cycling performance in professional cyclists

Jose Rodríguez-Marroyo 1, * Juan García-López 1 Karim Chamari 2 Alfredo Córdova 3 Olivier Hue 4 Jose Villa 1
* Corresponding author
1 Department of Physical Education and Sports
2 CNMSS - Research Unit National Center of Medicine and Science in Sport
3 Department of Biochemistry, Molecular Biology and Physiology
4 ACTES - Adaptations au Climat Tropical, Exercice et Santé
Abstract : The aims of this study were to evaluate the effects of both noncircular (ROT) and conventional (CON) chainring systems on aerobic and anaerobic cycling performances of professional cyclists, while analyzing the influence of varying the crank angle of maximum crank arm length of ROT. Fifteen professional road cyclists performed both incremental and sub-maximal aerobic tests and the Wingate anaerobic test in the laboratory. There were no statistical differences between CON and ROT in the aerobic tests, even when the best ROT position (ROT?) was selected. However, in the anaerobic test, maximal (4.2-9.1%) and mean (0.7-4.7%) power outputs were higher in ROT (P\0.05). These differences were greater when the ROT? was selected (11.2 and 7.0%, respectively). Our findings suggest that ROT is able to improve anaerobic but not aerobic cycling performance in professional cyclists. Nevertheless, it must be adapted to each cyclist to ensure these improvements.
Keywords : Professional cyclist Noncircular chainring Mechanical efficiency Maximal power output
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Jose Rodríguez-Marroyo, Juan García-López, Karim Chamari, Alfredo Córdova, Olivier Hue, et al.. The rotor pedaling system improves anaerobic but not aerobic cycling performance in professional cyclists. European Journal of Applied Physiology, Springer Verlag, 2009, 106 (1), pp.87-94. ⟨10.1007/s00421-009-0993-x⟩. ⟨hal-00701238⟩

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