Abstract
Purpose: To compare the oxygen-uptake (VO2) kinetics during skating on a treadmill and skating on a slide board and to discuss potential mechanisms that might control the VO2 kinetics responses during skating. Methods: Breath-by-breath pulmonary VO2 and near-infrared spectroscopy–derived muscle deoxygenated hemoglobin and myoglobin ([HHbMb]) were monitored continuously in 12 well-trained, young, long-track speed skaters. On-transient VO2 and [HHbMb] responses to skating on a treadmill and skating on a slide board at 80% of the estimated gas exchange threshold were fitted as monoexponential function. The signals were time-aligned, and the individual [HHbMb]-to-VO2 ratio was calculated as the average value from 20 to 120 s after exercise starts. Results: The time constants for the adjustment of phase II VO2 (τ VO2) and [HHbMb] (τ [HHbMb]) were low and similar between slide board and treadmill skating (18.1 [3.4] vs 18.9 [3.6] for τ VO2 and 12.6 [4.0] vs 12.4 [4.0] s for τ [HHbMb]). The ½HHbMb∶VO2 ratio was not different from 1.0 (P > .05) in both conditions. Conclusions: The fast VO2 kinetics during skating suggest that chronic adaptation to skating might overcome any possible restriction in leg blood flow during low-intensity exercise. The VO2 ratio values also suggest a good matching of O2 delivery to O2 utilization in trained speed skaters. The similar τ VO2 and τ [HHbMb] values between slide board and treadmill further reinforce the validity of using a slide board for skating testing and training purposes.
Original language | English |
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Pages (from-to) | 783-788 |
Number of pages | 6 |
Journal | International Journal of Sports Physiology and Performance |
Volume | 13 |
Issue number | 6 |
DOIs | |
Publication status | Published - Jul 2018 |
Externally published | Yes |
Keywords
- Speed skating
- Test validity
- Training
- VO kinetics