Table 1.
Results collected on the evening before entering the chamber (E0) for both sojourns
| NX | HH | P value | |
|---|---|---|---|
| E0 | E0 | Paired t test | |
| PV (ml) | 3249 ± 609 | 3335 ± 543 | 0.067 |
| Hbmass (g) | 815.2 ± 130.7 | 811.0 ± 129.1 | 0.429 |
| BV (ml) | 5681 ± 967 | 5770 ± 917 | 0.102 |
| SpO2 (%) | 98.0 ± 0.6 | 97.8 ± 0.8 | 0.441 |
| CaO2 (ml dl−1) | 18.9 ± 0.8 | 18.4 ± 0.7 | 0.008 ** |
| [Hb] (g dl−1) | 14.4 ± 0.6 | 14.1 ± 0.5 | 0.005 * |
| Hct (%) | 43.0 ± 1.8 | 42.2 ± 0.8 | 0.083 |
| PPC (g dl−1) | 7.2 ± 0.2 | 7.1 ± 0.3 | 0.039 * |
| TCP (g) | 235.0 ± 45.4 | 235.8 ± 42.57 | 0.818 |
| Renin activity (ng ml−1 h−1) | 0.40 ± 0.25 | 0.38 ± 0.27 | 0.922 |
| Aldosterone (pg ml−1) | 83.5 ± 49.55 | 81.7 ± 39.26 | 0.891 |
| Copeptin (pmol l−1) | 3.67 ± 0.96 | 4.58 ± 2.00 | 0.044 * |
| MR‐proANP (pmol l−1) | 49.0 ± 24.5 | 46.7 ± 29.1 | 0.567 |
| Plasma [Na+] (mmol l−1) | 139 ± 1 | 139 ± 2 | 0.378 |
| Plasma [Cl−] (mmol l−1) | 101 ± 2 | 101 ± 1 | 0.714 |
| Plasma [K+] (mmol l−1) | 3.8 ± 0.2 | 3.9 ± 1.5 | 0.671 |
Abbreviations: PV, plasma volume; Hbmass, haemoglobin mass; BV, blood volume; SpO2, peripheral oxyhaemoglobin saturation; CaO2, arterial oxygen content; [Hb], venous haemoglobin concentration; Hct, haematocrit; MR‐proANP, mid‐regional pro‐atrial natriuretic peptide; PPC, plasma protein concentration; TCP, total circulating protein; NX, normoxia; HH, hypobaric hypoxia; E0, evening before entering the chamber. N = 11. Values are presented as means ± SD; * P < 0.05; ** P < 0.01 HH vs. NX in paired t test.