JOURNAL OF SPORTS SCIENCE & MEDICINE
http://www.jssm.org
 
Research article
 

EFFECT OF THE ROTOR CRANK SYSTEM ON CYCLING PERFORMANCE

Simon A. Jobson1, James Hopker1, Andrew Galbraith1, Damian A. Coleman2 and Alan M. Nevill3

1Centre for Sports Studies, University of Kent, Kent, England, 2Department of Sport Science, Leisure and Tourism, Canterbury Christ Church University, Canterbury, Kent, England, 3Research Centre for Sport, Exercise and Performance, University of Wolverhampton, Walsall, West Midlands, England

Received   18 May 2009
Accepted   03 July 2009
Published   01 September 2009

Journal of Sports Science and Medicine (2009) 8, 463 - 467

ABSTRACT  
The aim of this study was to evaluate the impact of a novel crank system on laboratory time-trial cycling performance. The Rotor system makes each pedal independent from the other so that the cranks are no longer fixed at 180. Twelve male competitive but non-elite cyclists (mean s: 35 7 yr, Wmax = 363 38 W, VO2peak = 4.5 0.3 Lmin-1) completed 6-weeks of their normal training using either a conventional (CON) or the novel Rotor (ROT) pedal system. All participants then completed two 40.23-km time-trials on an air-braked ergometer, one using CON and one using ROT. Mean performance speeds were not different between trials (CON = 41.7 kmh-1 vs. ROT = 41.6 kmh-1, P > 0.05). Indeed, the pedal system used during the time-trials had no impact on any of the measured variables (power output, cadence, heart rate, VO2, RER, gross efficiency). Furthermore, the ANOVA identified no significant interaction effect between main effects (Time-trial crank system*Training crank system, P > 0.05). To the authors' knowledge, this is the first study to examine the effects of the Rotor system on endurance performance rather than endurance capacity. These results suggest that the Rotor system has no measurable impact on time-trial performance. However, further studies should examine the importance of the Rotor 'regulation point' and the suggestion that the Rotor system has acute ergogenic effects if used infrequently.

Key words: Gross efficiency, cycling performance, bicycle equipment.

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