Table 3.
Comparison between groups in ventilatory efficiency variables in the four experimental conditions.
| IMTG | Pre | Post | ANOVA | |||||
|---|---|---|---|---|---|---|---|---|
| Normoxia | Hypoxia | Normoxia | Hypoxia | Main effect (time) | Main effect (condition) | Main effect (group) | Interaction (condition × group × time) | |
| VE/VCO2 slope | 23.68 ± 2.94 | 28.77 ± 2.74# (1.3) | 25.6 ± 3.95 | 26.48 ± 2.77* (0.42) | 0.267 | 0.000 | 0.476 | 0.313 |
| LEqCO2 | 22.51 ± 1.32 | 24.72 ± 1.45# (1.2) | 22.73 ± 1.65 | 23.98 ± 1.64# (0.83) | 0.609 | 0.000 | 0.755 | 0.519 |
| EqCO2VT2 | 23.68 ± 2.33 | 27.26 ± 2.94# (1.3) | 24.32 ± 2.92 | 24.38 ± 2.11* (1.5) | 0.022 | 0.000 | 0.733 | 0.233 |
| OUES | 3.22 ± 0.75 | 3.13 ± 0.82 | 3.31 ± 0.83 | 2.92 ± 0.71# (0.81) | 0.493 | 0.007 | 0.994 | 0.203 |
| CG | ||||||||
| VE/VCO2 slope | 25.31 ± 2.35 | 29.81 ± 3.7# (1.7) | 25.63 ± 3.93 | 28.06 ± 3.5*# (1.2*−1.3#) | – | – | – | – |
| LEqCO2 | 22.75 ± 3.59 | 24.87 ± 2.17# (0.5) | 22.62 ± 1.98 | 24.73 ± 1.58# (1.9) | – | – | – | – |
| EqCO2VT2 | 24.26 ± 2.05 | 27.15 ± 2.81# (0.8) | 24.15 ± 3.11 | 25.7 ± 2.73* (0.8) | – | – | – | – |
| OUES | 3.36 ± 0.56 | 2.98 ± 0.91 | 3.24 ± 0.52 | 3.01 ± 0.55# (1.0) | – | – | – | – |
Data are presented as Mean ± SD and Effect size (ES). ES is showed when a statistical difference was found. VE/VCO2 slope, Slope of the relationship between VCO2 and VE; LEqCO2, lowest equivalent of CO2 during the incremental test; EqCO2VT2, equivalent of CO2 in the second ventilatory threshold; OUES, oxygen uptake efficiency slope. ANOVA mixed-effects Bonferroni post-hoc test:
*
Mixed-effects ANOVA Pre vs. Post in the same condition (p < 0.05).
#
Mixed-effects ANOVA Nor vs. Hyp at the same time (p < 0.05).