| Autor: |
Pessoa Filho, D.M., Alves, F.B., Reis, J.F., Greco, C.C., Denadai, B.S. |
| Předmět: |
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| Zdroj: |
International Journal of Sports Medicine; Sep2012, Vol. 33 Issue 9, p744-748, 5p, 3 Charts, 1 Graph |
| Abstrakt: |
The purpose of this study was to describe the VO2 kinetics above and below respiratory compensation point (RCP) during swimming. After determination of the gas-exchange threshold (GET), RCP and VO2max , 9 well-trained swimmers (21.0 ± 7.1 year, VO2max = 57.9 ± 5.1 ml.kg - 1 .min - 1 ), completed a series of "square-wave" swimming transitions to a speed corresponding to 2.5 % below (S - 2.5 % ) and 2.5 % above (S +2.5 % ) the speed observed at RCP for the determination of pulmonary VO2 kinetics. The trial below (~2.7 %) and above RCP (~2 %) was performed at 1.28 ± 0.05 m.s -1 (76.5 ± 6.3 % VO2max) and 1.34 0.05 m.s - 1 (91.3 ± 4.0 % VO2max), respectively. The time constant of the primary component was not different between the trials below (17.8 ± 5.9 s) and above RCP (16.5 ± 5.1 s). The amplitude of the VO2 slow component was similar between the exercise intensities performed around RCP (S - 2.5 % = 329.2 ± 152.6 ml. min - 1 vs. S +2.5 % = 313.7 ± 285.2 ml.min - 1 ), but VO2max was attained only during trial performed above RCP (S -2.5 % = 91.4 ± 5.9 % VO2max vs . S +2.5 % = 103.0 ± 8.2 % VO2max). Thus, similar to the critical power during cycling exercise, the RCP appears to represent a physiological boundary that dictates whether VO2 kinetics is characteristic of heavy- or severe-intensity exercise during swimming. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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