Cardiorespiratory variables measured during steady state exercise in the upright and aero positions
| Measurement | 50U | 50A | 100U | 100A | 150U | 150A | p Value |
|---|---|---|---|---|---|---|---|
| Values are mean (SD). | |||||||
| U, Upright; A, aero; 50U means exercise at 50 W in upright position, etc. | |||||||
| *Differences significant. | |||||||
| Tidal volume (litres) | 1.04 (0.27) | 1.05 (0.17) | 1.43 (0.24) | 1.37 (0.26) | 1.79 (0.21) | 1.68 (0.26) | 0.21 |
| Breathing frequency (breaths/min) | 24 (6) | 25 (3) | 27 (6) | 29 (7) | 32 (7) | 35 (9) | 0.07 |
| Respiratory exchange ratio | 0.94 (0.04) | 0.94 (0.05) | 0.96 (0.03) | 0.97 (0.04) | 0.98 (0.02) | 0.99 (0.04) | 0.58 |
| Minute ventilation (litres/min) | 24.79 (1.57) | 26.12 (2.25) | 37.39 (3.04) | 39.51 (2.39) | 56.16 (7.58) | 56.49 (8.36) | 0.13 |
| Heart rate (beats/min) | 111 (13) | 113 (7) | 140 (13) | 141 (7) | 168 (12) | 167 (11) | 0.87 |
| Vo2 (ml/kg/min) | 16.06 (1.15) | 17.34 (0.91) | 24.04 (1.08) | 25.80 (1.45) | 33.62 (2.30) | 34.46 (2.50) | 0.00* |