Table 2.
Haemodynamic and ventilatory responses to standing up in eight normal subjects
| Q (l min−1) | V̇CO2 (ml min-1) | V̇O2 (ml min−1) | PETCO2 (mmHg) | R-R (min−1) | VT (ml) | VE (l min−1) | |
|---|---|---|---|---|---|---|---|
| Supine | 6.5 ± 1.1 | 217 ± 36 | 263 ± 60 | 40 ± 1 | 16 ± 4 | 490 ± 105 | 7.9 ± 1.4 |
| Standing | 4.0 ± 0.9 | 248 ± 53 | 263 ± 65 | 36 ± 2 | 13 ± 3 | 734 ± 199 | 9.8 ± 2.7 |
| P value* | 0.002 | n.s. | n.s. | < 0.001 | 0.03 | 0.005 | 0.03 |
Group average values (mean ± s.D.) for cardiac output (Q), CO2 output (V̇CO2), oxygen uptake (V̇O2), end-tidal CO2 pressure (PETCO2), respiratory rate (R-R), tidal volume (VT) and expired ventilation (VE) as determined from 150 s in the supine position followed by 150 s of standing. Data from the study of van Lieshout et al. (2001).
*
Standing versus supine, paired t test.