Respiratory frequency, V˙o2, and respiratory exchange ratio during the cycling endurance trial
| Variable | Time (min) | IRL | PLA | CON | ||||
|---|---|---|---|---|---|---|---|---|
| Before | After | Before | After | Before | After | |||
| Values are mean (SD) (n = 5). | ||||||||
| IRL, Inspiratory resistive loading; PLA, placebo; CON, control; Bf, respiratory frequency; V˙o2, oxygen consumption; RER, respiratory exchange ratio. | ||||||||
| Bf (breaths/min) | 10 | 34.2 (4.0) | 34.6 (2.2) | 34.2 (4.2) | 33.3 (4.9) | 31.6 (5.4) | 32.8 (6.3) | |
| 20 | 38.0 (4.4) | 37.2 (3.1) | 37.8 (5.2) | 36.5 (2.1) | 33.2 (6.1) | 32.8 (4.7) | ||
| 30 | 44.2 (10.6) | 39.4 (3.3) | 44.0 (8.0) | 45.3 (10.9) | 40.6 (7.8) | 35.6 (7.2) | ||
| V˙o2 (litres/min) | 10 | 2.6 (0.3) | 2.7 (0.2) | 1.9 (0.4) | 1.9 (0.2) | 2.2 (0.7) | 2.2 (0.4) | |
| 20 | 2.6 (0.3) | 2.7 (0.3) | 1.9 (0.4) | 2.0 (0.3) | 2.2 (0.8) | 2.2 (0.5) | ||
| 30 | 2.6 (0.5) | 2.8 (0.2) | 1.8 (0.5) | 2.0 (0.4) | 2.2 (0.8) | 2.2 (0.4) | ||
| RER | 10 | 1.04 (0.09) | 0.99 (0.03) | 1.08 (0.04) | 1.03 (0.13) | 1.09 (0.05) | 1.06 (0.09) | |
| 20 | 1.03 (0.10) | 0.96 (0.03) | 1.07 (0.05) | 1.02 (0.17) | 1.09 (0.03) | 1.04 (0.06) | ||
| 30 | 1.03 (0.10) | 0.96 (0.05) | 1.06 (0.07) | 1.00 (0.12) | 1.08 (0.03) | 1.02 (0.09) | ||