TABLE 4.
VENTILATION–WORKLOAD RATIOS DURING EXERTION
| Setting | RA | 2LO2 | D1 | D2 | D3 | D4 | P Value |
|---|---|---|---|---|---|---|---|
| 2 | 12.6 ± 3.4 | 3.5 ± 0.4 | 4.5 ± 0.8 | 5.4 ± 0.9 | 4.3 ± 0.7 | 4.4 ± 0.8 | <0.001 |
| 5 | — | 3.5 ± 0.4 | 4.1 ± 0.5 | 5.4 ± 0.9 | 4.2 ± 0.7 | 3.7 ± 0.8 | 0.31 |
| Continuous | — | 3.5 ± 0.4 | 3.0 ± 0.4 | 2.7 ± 0.5 | 3.5 ± 0.6 | 2.8 ± 0.5 | 0.55 |
| P value | — | 1.0 | 0.18 | 0.03 | 0.63 | 0.26 | — |
Definition of abbreviations: D = device; RA = room air; 2LO2 = O2 at a flow of 2 L/min.
The P values at the end of the rows and columns represent between- and within-group comparisons, respectively. The RA and 2LO2 trials are compared with the conserver setting of 2 data. The 2LO2 trials are compared with the regulator setting of 2 conserver data. The lower the ratio, the less the ventilatory requirements for a given work load. The data are mean values ± 1 SEM.