Table 2.
Peak values of the main cardiopulmonary variables determined during an incremental bicycle exercise test before (BL) and after bed rest (R + 1)
| BL (BDC-7) | R + 1 (standardised diet) | R + 1 (NUTR) | |
|---|---|---|---|
| Peak HR (beats·min−1) | 187 ± 7 | 192 ± 3 | 193 ± 7 |
| RER (V'CO2/V'O2) | 1.27 ± 0.07 | 1.28 ± 0.10 | 1.30 ± 0.14 |
| VE peak (L·min−1) | 160 ± 20 | 163 ± 29 | 171 ± 19 |
| V'CO2max (mL·min−1) | 4.39 ± 0.46 | 3.97 ± 0.62* | 4.20 ± 0.36* |
| V'O2max (mL·min−1) | 4.03 ± 0.58 | 3.32 ± 0.64* | 3.51 ± 0.67* |
| Power (W) | 278 ± 51 | 236 ± 62* | 257 ± 47* |
| V'O2max/BMI (mL·kg−1·min−1) | 53 ± 6 | 45 ± 6* | 46 ± 8* |
| V'O2/beat (mL·beat−1) | 22 ± 3 | 17 ± 3** | 18 ± 3** |
Data are mean±SD. BL = before bed rest (BDC−7), R+1 = bed rest. ** P=0.001; *P<0.01 vs BL
BMI body max index, HR heart rate, RER respiratory exchange ratio, VE ventilation, V′O2 oxygen consumption, V′O2max maximal oxygen uptake, V′CO2 carbon dioxide emission