Table 1.
Group mean respiratory results (±SEM) for the eight subjects
| Condition | Insp CO2, % | Exp CO2, % | Resp. rate, min−1 | Tidal volume, liter | Min vent, liter/min | Heart rate, min−1 | Breathlessness |
|---|---|---|---|---|---|---|---|
| Rest | 0.1 | 5.4 (0.1) | 11 (0.2) | 0.72 (0.05) | 6.2 (0.2) | 67 (1) | 0 |
| CO2FM | 7.8 (0.3)*** | 8.8 (0.1)*** | 15 (0.6) | 1.51 (0.19) | 22.7 (3.0)*** | 78 (3)* | 73 (5) |
| CO2MP | 7.3 (0.2)*** | 8.6 (0.1)*** | 14 (0.6) | 1.24 (0.17) | 17.0 (2.3)*** | 72 (2)* | 55 (4) |
Significance of increase of CO2FM and CO2MP conditions relative to the rest condition: *, P < 0.01; **, P < 0.001; ***, P < 0.0001. Statistical tests were not made separately for respiration rate and tidal volume, because these measures are combined to form the minute ventilation rates.