Abstract
Abstract AIM The aim of this study was to describe the behavior of different cardiopulmonary variables in exercise session with constant running speed, corresponding to the intensity of ventilatory anaerobic threshold and identifying the steady state in a different level of performance. METHODS A cross-sectional study with nine elite athletes (31 ± 5.7 years, 1.7 ± 0.05 meters and 2max 68.6 ± 3.2 mL·kg-1·min-1) and nine non-athletes (32 ± 10 years, 1.8 ± 0.1 meters and 2max 47.2± 4.4 mL·kg-1·min-1). Two visits to the laboratory have been conducted. Firstly, cardiopulmonary exercise testing until voluntary exhaustion took place to identify ventilatory thresholds and maximum oxygen consumption (2max) and secondly, there was a running session for 1 hour in ventilatory anaerobic threshold speed, with continuous measurement of exhaled gases. A range of 5% (∆5%) for VO2 and PetCO2 was used; 5.5% (∆5.5%) for VE and 3% (∆3%) for respiratory exchange ratio (RER) and one-way ANOVA with statistical significance of p ≤ 0.05 to identify the steady state of results. OOO RESULTS A session with constant speed related to ventilatory anaerobic threshold intensity showed similarity in the steady state of ventilatory variables except for RER in the NA group (p ≤ 0.05). CONCLUSION It was possible to identify the steady state from ventilatory variables related to ventilatory anaerobic threshold intensity that occurred independently of the physical performance level.
Highlights
Aerobic exercise through the continuous method is the most common running training prescription
The speeds reached at Ventilatory Anaerobic Threshold (VAT)
1.1 km·h-1 and AE = 22.2 ± 0.9 km·h-1, p < 0.001, ES = 5.69), were 41% and 27% higher for the elite athletes (EA) group, with statistical differences between the groups and a very large effect size. (Table 2) The VE, respiratory exchange ratio (RER) and V·O2 variables were statistically different between the groups (p ≤ 0.05) with values of 33%, 26% and
Summary
Aerobic exercise through the continuous method is the most common running training prescription. For an accurate evaluation of steady state, there is a need for equipment with good accuracy in the metabolic variables measurement, and lactate and heart rate (HR)[4]. This way, the cardiopulmonary exercise testing (CPx), and the goldstandard method for prognostic and diagnostic of cardiopulmonary diseases, can be used to prescribe physical exercises as well as evaluate the physiological steady state, identify ventilatory thresholds and the maximum consumption of O2 (V·O2max) in a non-invasive way, through gas exchange analysis[5]. Its identification can be made by the non-linear increase in pulmonary ventilation, by the increases in the ventilatory equivalent of concomitant increase of VE/V·CO26 and
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