Table 2.
Group mean respiratory results (± SEM) for the eight subjects
| Condition | Insp CO2 (%) | Exp CO2 (%) | Resp. rate (min−1) | Tidal volume (liters) | Min vent (liters/min) | Heart rate (min−1) | Breathlessness |
|---|---|---|---|---|---|---|---|
| Rest | 0.10 (<0.01) | 5.4 (0.1)*** | 11 (0.2) | 0.72 (0.05) | 6.2 (0.2)*** | 67 (1)* | 0*** |
| CO2FM | 7.80 (0.3) | 8.8 (0.1) | 15 (0.6) | 1.51 (0.19) | 22.7 (3.0) | 78 (3) | 73 (5) |
| O2FM | 0.10 (<0.01) | 5.2 (0.2)*** | 10 (1) | 0.75 (0.16) | 6.6 (1.4)** | 62 (2)* | 5 (3)*** |
| PBFM & MP | 0.20 (0.01) | 4.5 (0.3)*** | 19 (1) | 0.57 (0.11) | 10.3 (1.9)** | 70 (4) | 10 (4)*** |
Significance of difference of the rest, O2 FM, and PB conditions relative to CO2 FM: *, P < 0.01; **, P < 0.001; ***, P < 0.0001.