The slope of the VO₂ slow component is associated with exercise intolerance during severe-intensity exercise

Barbosa, L.F. and Greco, C.C. and Denadai, Benedito (2014) The slope of the VO₂ slow component is associated with exercise intolerance during severe-intensity exercise. Acta Physiologica Hungarica, 101 (4). pp. 517-523. ISSN 0231-424X

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Abstract

The aim of this study was to analyze the relationship between the slope of the VO₂ slow component (VO₂sc) and exercise tolerance (tlim) during constant-work-rate (CWR) exercise performed within the severe intensity domain. Fifteen active subjects (VO₂max = 41.2 ± 5.1 ml.kg⁻¹.min⁻¹) performed the following tests: 1) an incremental test to determine the VO₂max and the work rate associated with the VO₂max (IVO₂max) and; 2) two CWR transitions at 95% of the IVO₂max to determine the slope of the VO₂ slow component and the tlim. Three tlims were obtained: tlim1 = CWR1; tlim2 = CWR2; and tlim1+2 = (CWR1 + CWR2) / 2. There was no significant difference between the VO₂max (3271.7 ± 410.7 mL·min⁻¹) and VO₂peak obtained during the CWR tests (CWR1 = 3356.3 ± 448.8 mL·min⁻¹, CWR2 = 3362.2 ± 393.4 mL·min⁻¹, p > 0.05). Significant correlations (p < 0.05) were found among the VO₂sc kinetics and tlim1 (r = −0.53), tlim2 (r = −0.49) and tlim1+2 (r = −0.55). Thus, exercise tolerance during CWR performed within the severe intensity domain is partially explained by the slope of the VO₂ slow component.

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