Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
ISSN: 1303 - 2968   
Ios-APP Journal of Sports Science and Medicine
Androit-APP Journal of Sports Science and Medicine
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©Journal of Sports Science and Medicine (2008) 07, 132 - 138

Research article
Aerobic Fitness Level Typical of Elite Athletes is not Associated With Even Faster VO Kinetics During Cycling Exercise
Tiago R. Figueira, Fabrizio Caputo, Carlos E.P. Machado, Benedito S. Denadai 
Author Information
Human Performance Laboratory, Rio Claro S.P., Brasil

Benedito S. Denadai
✉ Human Performance Laboratory, UNESP. Av. 24 A, 1515, Bela Vista, Rio Claro, SP, CEP - 13506-900, Brasil.
Email: bdenadai@rc.unesp.br
Publish Date
Received: 14-03-2007
Accepted: 07-01-2008
Published (online): 01-03-2008
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ABSTRACT

The aim of this study was to address the question if the VO2 kinetics is further improved as the aerobic training status increases from trained to elite level athletes. Maximal oxygen uptake (VO2max), work-rate associated to VO2max (IVO2max) and VO2 kinetics of moderate (Mod) and maximal exercise (Max) were determined in fifty- five subjects. Then, they were assigned into three groups: low (LF), intermediate (IF) and high (HF) aerobic fitness level. In average, the VO2max of LF, IF and HF groups were, respectively, 36.0 ± 3.1, 51.1 ± 4.5 and 68.1 ± 3.9 ml·kg·min-1 (p ≤ 0.05 among each other). VO2 kinetics mean response time of both exercise intensities were significantly faster (p ≤ 0.05) in HF (Mod, 27.5 ± 5.5 s; Max, 32.6 ± 8.3 s) and IF (Mod, 25.0 ± 3.1 s; Max, 42.6 ± 10.4 s) when compared to LF (Mod, 35.7 ± 7.9 s; Max: 57.8 ± 17.8 s). We can conclude that VO2 kinetics is improved as the fitness level is increased from low to intermediate but not further improved as the aerobic fitness level increases from intermediate to high.

Key words: Oxidative metabolism, VO kinetics, aerobic training


           Key Points
  • Currently, it is reasonable to believe that the rate-limiting step of VO kinetics depends on exercise intensity.
  • The well known physiological adaptations induced by endurance training are likely the most extreme means to overcome rate-limiting steps determining VO kinetics across exercise intensities.
  • However, exercise adaptation leading individuals to the high-end of aerobic fitness level range (VOmax > 65 ml.kg.min-1) is not able to further improve VO kinetics during both, moderate and maximal intensity exercise.
 
 
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