Table 2.
Cardiorespiratory and perceptual responses to steady-state exercise.
| Power output (W) | ||||
|---|---|---|---|---|
| Trial | 20 | 40 | 60 | |
| VO2 (L/min) | Placebo | 0.81 ± 0.09 | 1.00 ± 0.09 | 1.26 ± 0.12 |
| Nitrate | 0.87 ± 0.10 | 1.08 ± 0.11 | 1.34 ± 0.13 | |
| VO2 (mL.min-1.kg-1) | Placebo | 7.8 ± 0.4 | 9.8 ± 0.7 | 12.3 ± 1.0 |
| Nitrate | 8.4 ± 0.5 | 10.5 ± 0.7 | 13.1 ± 1.0 | |
| % of VO2peak | Placebo | 38.5 ± 3.9 | 48.1 ± 5.0 | 60.6 ± 6.6 |
| Nitrate | 38.0 ± 3.2 | 47.5 ± 4.0 | 59.1 ± 4.9 | |
| Ve (L/min) | Placebo | 22.5 ± 2.7 | 26.8 ± 2.9 | 33.9 ± 4.1 |
| Nitrate | 24.1 ± 3.6 | 29.5 ± 4.6 | 36.1 ± 5.3 | |
| Ve/VO2 (L/L) | Placebo | 27.5 ± 1.0 | 26.5 ± 1.0 | 26.6 ± 1.3 |
| Nitrate | 27.2 ± 1.5 | 26.6 ± 1.7 | 26.4 ± 1.7 | |
| Ve/VCO2 (L/L) | Placebo | 33.9 ± 1.2 | 31.8 ± 1.3 | 30.6 ± 1.2 |
| Nitrate | 33.5 ± 1.7 | 32.2 ± 1.6 | 30.9 ± 1.6 | |
| Respiratory exchange ratio | Placebo | 0.81 ± 0.01 | 0.83 ± 0.01 | 0.87 ± 0.02 |
| Nitrate | 0.81 ± 0.02 | 0.82 ± 0.02 | 0.85 ± 0.02 | |
| Gross efficiency (%) | Placebo | 7.6 ± 0.8 | 12.1 ± 1.2 | 14.4 ± 1.4 |
| Nitrate | 7.2 ± 0.6 | 11.3 ± 0.9 | 13.6 ± 1.1 | |
| Heart rate (beats/min) | Placebo | 85 ± 3 | 98 ± 7 | 103 ± 5 |
| Nitrate | 96 ± 5 | 101 ± 4 | 107 ± 9 | |
| Systolic blood pressure (mmHg) | Placebo | 136 ± 7 | 141 ± 7 | 143 ± 8 |
| Nitrate | 132 ± 9 | 137 ± 9 | 136 ± 8 | |
| Diastolic blood pressure (mmHg) | Placebo | 76 ± 5 | 75 ± 5 | 76 ± 5 |
| Nitrate | 84 ± 5 | 81 ± 4 | 78 ± 5 | |
| Perceived exertion (units) | Placebo | 8 ± 1 | 9 ± 1 | 10 ± 1 |
| Nitrate | 8 ± 1 | 10 ± 1 | 12 ± 1 | |
Values are mean±S.E. for n=8. VO2, oxygen uptake. Ve, ventilation. VCO2, carbon dioxide production.