Table 1.
Characteristics of the theoretical astronaut populations.
| Stature (m) | 1.50 | 1.60 | 1.70 | 1.80 | 1.90 |
|---|---|---|---|---|---|
| BM (kg) | 59.6 | 67.8 | 76.6 | 85.9 | 95.7 |
| BSA (m2) | 1.54 | 1.71 | 1.88 | 2.06 | 2.24 |
| VO2max (L/min) | 2.59 | 2.94 | 3.32 | 3.73 | 4.15 |
| Rest | |||||
| RMR (MJ/d) | 5.78 | 6.44 | 7.13 | 7.85 | 8.60 |
| NEAT (MJ/d) | 2.31 | 2.58 | 2.85 | 3.14 | 3.44 |
| VO2 (L/min) | 0.197 | 0.224 | 0.253 | 0.283 | 0.316 |
| VCO2 (L/min) | 0.155 | 0.176 | 0.199 | 0.223 | 0.249 |
| Basal Mprod (J/s) | 65.7 | 74.8 | 84.4 | 94.7 | 105.5 |
| Basal fluid needs (L/d) | 2.63 | 2.74 | 2.86 | 2.99 | 3.13 |
| CM exercise @ 75% VO2max | |||||
| VO2 (L/min) | 1.94 | 2.21 | 2.49 | 2.79 | 3.11 |
| VCO2 (L/min) | 1.74 | 1.98 | 2.24 | 2.51 | 2.80 |
| EE (kcal/min) | 9.6 | 10.9 | 12.3 | 13.8 | 15.4 |
| Mprod (J/s) | 667 | 759 | 857 | 960 | 1,070 |
| SR (mL/min) | 10.1 | 11.7 | 13.4 | 15.2 | 17.1 |
BM body mass; BSA body surface area; VO2max maximal rate of oxygen uptake, RMR resting metabolic rate, NEAT non-exercise activity thermogenesis, VO2 rate of oxygen consumption, VCO2 rate of carbon dioxide production, CM countermeasure, EE energy expenditure, Mprod rate of metabolic heat production, SR sweat rate. See main text for definition of assumptions.