Table 3.
Comparison between beetroot juice (BJ) supplementation and placebo (PL) experimental condition on cardiorespiratory variables
| EC | VT1 | VT2 | Total (VT1 + VT2) | P 1 | P 2 | |
|---|---|---|---|---|---|---|
| HR(beats·sec−1) | BJ | 130.7 (17.3) | 159.6 (11.7) | 145.1 (13.8) | 0.517 | 0.485 |
| PL | 129.4 (17.2) | 160.0 (14.0) | 144.3 (14.0) | |||
| VO2 (L·min−1) | BJ | 2.4 (0.4) | 3.4 (0.3) | 2.9 (0.3) | 0.241 | 0.493 |
| PL | 2.4 (0.5) | 3.3 (0.4) | 2.9 (0.4) | |||
| VO2 (%) | BJ | 61.8 (11.3) | 85.9 (7.6) | 73.8 (8.9) | 0.253 | 0.512 |
| PL | 60.5 (12.2) | 83.9 (8.3) | 72.2 (9.4) | |||
| VCO2 (L·min−1) | BJ | 2.5 (0.4) | 3.7 (0.4) | 3.1 (0.3) | 0.001 | 0.579 |
| PL | 2.4 (0.5) | 3.5 (0.5) | 2.9 (0.4) | |||
| RER | BJ | 0.9 (0.0) | 1.1 (0.1) | 1.0 (0.0) | 0.106 | 0.623 |
| PL | 0.9 (0.1) | 1.1 (0.1) | 1.0 (0.0) | |||
| VE (L·min−1) | BJ | 74.9 (14.6) | 127.6 (19.9) | 101.2 (15.9) | 0.054 | 0.622 |
| PL | 72.9 (16.8) | 125.5 (23.5) | 96.8 (16.8) | |||
| VE·VO2−1 | BJ | 28.9 (2.1) | 36.3 (4.5) | 32.6 (2.9) | 0.483 | 0.587 |
| PL | 28.4 (1.9) | 36.5 (5.7) | 31.6 (2.5) | |||
| VE·VCO2−1 | BJ | 28.9 (1.6) | 33.4 (3.1) | 31.1 (2.1) | 0.162 | 0.573 |
| PL | 29.3 (1.6) | 34.2 (4.4) | 31.1 (1.9) |
Data are provided as mean ± standard deviation (SD) and percentage (%)
Abbreviations: EC experimental condition, HR heart rate, RER respiratory exchange ratio, VCO2 carbon dioxide, VE minute ventilation, VE·VCO2−1 ventilatory equivalent for carbon dioxide, VE·VO2− 1 ventilatory equivalent for oxygen, VO2 oxygen uptake, VO2max maximal oxygen uptake, VT1 first ventilatory threshold, VT2 second ventilatory threshold
1Significant differences for supplementation effect
2Significant differences for supplementation x intensity interaction