Abstract

Steady-state track VO2 was estimated by means of the retroextrapolation method in seventeen competitive male cyclists at speeds ranging from 28 to 43 km/h. Peak VO2 was also determined using an ergocycle multistage test (80 rev/min). Results showed large VO2 variations at similar speeds on the track (SEE > 10 Y; n=17). Third degree regressions were the most accurate to describe the evolution of VO2 with speed. When categorized according to the Quebec Cycling Federation ranking. (elites:n=6;nonelites:n=11), the elites tended to demonstrate a lower mean VO2 for the range of velocities studied. The difference was, however, not statistically significant. Interindividual variations were reduced by expressing VO2 and speeds as relative percentages of maximal values in ten subjects: MAP = 6.475 e exp (0.0274MAS) where MAP = track VO2/ laboratory peak VO2, and MAS = speed/speed associated with peak VO2 on the track. No significant difference was observed between track and ergocycle peak VO2, indicating the validity of the 80 rev/min protocol for laboratory evaluation of racing cyclists. The concept of cycling economy as a contributing factor to performance and applications of the MAP- MAS relationship are discussed. Verf.-Referat