Table 3.
24-h values for theoretical male astronaut populations without, and with, the use of ISS-like countermeasure (CM) exercise (modelled as two bouts of 30-min of cycle ergometry at 75% VO2max).
| Stature (m) | 1.50 | 1.60 | 1.70 | 1.80 | 1.90 |
|---|---|---|---|---|---|
| No exercise | |||||
| TEE (MJ) | 8.9 | 9.9 | 10.8 | 11.9 | 12.9 |
| O2 (L) | 397 | 451 | 510 | 571 | 636 |
| CO2 (L) | 313 | 356 | 401 | 450 | 501 |
| Hprod (MJ) | 5.7 | 6.5 | 7.3 | 8.2 | 9.1 |
| Water requirements (L) | 2.63 | 2.74 | 2.86 | 2.99 | 3.13 |
| CM exercise | |||||
| TEE (MJ) | 11.9 (+ 29) | 12.8 (+ 29) | 14.1 (+ 30) | 15.5 (+ 31) | 17.0 (+ 32) |
| VO2 (L) | 494 (+ 31) | 562 (+ 31) | 634 (+ 31) | 711 (+ 31) | 792 (+ 31) |
| VCO2 (L) | 423 (+ 35) | 482 (+ 35) | 544 (+ 35) | 610 (+ 35) | 679 (+ 35) |
| Hprod (kJ) | 8.1 (+ 42) | 9.2 (+ 42) | 10.4 (+ 42) | 11.6 (+ 42) | 13.0 (+ 42) |
| Water requirements (L) | 3.23 (+ 23) | 3.44 (+ 26) | 3.67 (+ 28) | 3.90 (+ 30) | 4.16 (+ 33) |
TEE, total energy expenditure, O2 total oxygen consumed, CO2 total carbon dioxide produced, Hprod total metabolic heat produced. Numbers in brackets indicate the difference (%) between data without, and with CM exercise. See main text for definition of assumptions.