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 (2011) 10, 584 - 589

Research article
Oxygen Uptake Kinetics During Incremental- and Decremental-Ramp Cycle Ergometry
Fadil Özyener1,2, , Harry B. Rossiter1,3, Susan A. Ward4, Brian J. Whipp1,4
Author Information
1 Dept of Physiology, St George's Hospital Medical School, London, United Kingdom
2 Dept of Physiology, Uludag University Medical School, Bursa, Turkey
3 Institute of Membrane and Systems Biology, Faculty of Biological Sciences, University of Leeds, Leeds, United Kingdom
4 Human Bio-Energetics Research Centre, Crickhowell, Powys, United Kingdom

Fadil Özyener
✉ Uludag University, Medical School, Department of Physiology, 16059 Bursa, Turkey
Email: fozyener@uludag.edu.tr
Publish Date
Received: 28-06-2011
Accepted: 01-08-2011
Published (online): 01-09-2011
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ABSTRACT

The pulmonary oxygen uptake (VO2) response to incremental-ramp cycle ergometry typically demonstrates lagged-linear first-order kinetics with a slope of ~10-11 ml·min-1·W-1, both above and below the lactate threshold (θL), i.e. there is no discernible VO2 slow component (or “excess” VO2) above θL. We were interested in determining whether a reverse ramp profile would yield the same response dynamics. Ten healthy males performed a maximum incremental -ramp (15-30 W·min-1, depending on fitness). On another day, the work rate (WR) was increased abruptly to the incremental maximum and then decremented at the same rate of 15-30 W.min-1 (step-decremental ramp). Five subjects also performed a sub-maximal ramp-decremental test from 90% of θL. VO2 was determined breath-by-breath from continuous monitoring of respired volumes (turbine) and gas concentrations (mass spectrometer). The incremental-ramp VO2-WR slope was 10.3 ± 0.7 ml·min-1·W-1, whereas that of the descending limb of the decremental ramp was 14.2 ± 1.1 ml·min-1·W-1 (p < 0.005). The sub-maximal decremental-ramp slope, however, was only 9. 8 ± 0.9 ml·min-1·W-1: not significantly different from that of the incremental-ramp. This suggests that the VO2 response in the supra-θL domain of incremental-ramp exercise manifest not actual, but pseudo, first-order kinetics.

Key words: Oxygen uptake-work rate gain, incremental-ramp exercise, decremental-ramp exercise, system linearity.


           Key Points
  • The slope of the decremental-ramp response is appreciably greater than that of the incremental.
  • The response dynamics in supra-θ domain of the incremental-ramp appear not to manifest actual first-order kinetics.
  • The mechanisms underlying the different dynamic response behaviour for incremental and decremental ramps are presently unclear.
 
 
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