Table 2.
Mean values for cardiorespiratory variables during the four 6-h periods studied
| Manual turning + | Continuous rotation + | |||
| Cardiorespiratory variable | Manual turning | P&PD | Continuous rotation | P&PD |
| Mean VO2 (ml/min) | 299 ± 88 | 323 ± 114 | 288 ± 79 | 302 ± 97 |
| Mean VCO2 (ml/min) | 269 ± 71 | 294 ± 69 | 260 ± 73 | 272 ± 77 |
| Mean PIP (cmH2O) | 38 ± 9 | 40 ± 9 | 36 ± 10 | 38 ± 8 |
| Mean Pplat (cmH2O) | 34 ± 7 | 37 ± 6 | 33 ± 6 | 34 ± 6 |
| Mean Vt (ml) | 733 ± 104 | 710 ± 119 | 751 ± 96 | 745 ± 113 |
| Vd/Vt (%) | 0.62 ± 0.18 | 0.63 ± 0.23 | 0.59 ± 0.18 | 0.64 ± 0.19 |
| Cardiac output (litres/min) | 7.4 ± 2.3 | 7.8 ± 2.7 | 7.1 ± 2.2 | 7.4 ± 2.7 |
| Turns per 6 h | 2.5 ± 0.4 | 3.0 ± 0.2 | 41 ± 8* | 43 ± 20* |
Values are means ± SD of data recorded every hour for the study period, except Vd/Vt, which was every 3 h. PIP, peak inspiratory pressure; P&PD, percussion and postural drainage; Pplat, inspiratory plateau pressure; VO2, oxygen consumption; VCO2, CO2 production.