Table 2.
Aerobic fitness, metabolic and heart rate variables
| Normoxia (FIO2 = 0.21) | Hypoxia (FIO2 = 0.12) | |||||||
|---|---|---|---|---|---|---|---|---|
| Control (n=16) | Preterm (n=12) | p-value | Cohen’s d | Control (n=16) | Preterm (n=8) | p-value | Cohen’s d | |
| VO2max (L/min)* | 3.46 ± 0.62 | 2.43 ± 0.70 | <0.001 | 1.63 | 2.58 ± 0.50 | 1.79 ± 0.70 | 0.002 | 1.79 |
| VO2max (mL/kg/min)* | 45.79 ± 8.71 | 34.88 ± 9.26 | 0.003 | 2.15 | 34.47 ± 7.52 | 26.49 ± 10.52 | 0.029 | 1.25 |
| Pmax (watts)* | 231 ± 40 | 175 ± 45 | 0.002 | 1.42 | 186 ± 28 | 154 ± 39 | 0.020 | 1.53 |
| Tmax (minutes)* | 13.48 ± 4.16 | 9.79 ± 3.36 | 0.021 | 0.99 | 9.06 ± 1.75 | 6.98 ± 2.45 | 0.016 | 0.94 |
| HRrest (bpm) | 70 ± 11 | 80 ± 16 | 0.115 | 0.74 | 97 ± 12 | 113 ± 11 | 0.008 | 1.39 |
| HRmax (bpm) | 182 ± 12 | 182 ± 8 | 0.953 | 0.10 | 179 ± 10 | 180 ± 6 | 0.851 | 0.15 |
| HRR1min (bpm) | 31 ± 10 | 20 ± 4 | 0.001 | 2.55 | 26 ± 8 | 19 ± 5 | 0.039 | 1.47 |
| HRR2min (bpm) | 54 ± 11 | 41 ± 7 | 0.001 | 1.88 | 49 ± 13 | 39 ± 7 | 0.028 | 1.47 |
| VTVO2 (ml/kg/min)* | 37.86 ± 5.82 | 28.50 ± 6.60 | <0.001 | 0.274 | 28.23 ± 6.51 | 21.88 ± 9.11 | 0.043 | 0.081 |
Data are expressed as mean ± standard deviation (SD). Variables defined: VO2max, maximal aerobic capacity expressed absolutely (L/min) and relative to body weight (ml/kg/min); Pmax, maximal wattage attained for more than one half of final stage of incremental maximal exercise test; Tmax, time to exhaustion during maximal exercise test; HRmax, maximal HR attained during maximal exercise testing; HRR1min, HRR at one minute of resting recovery; HRR2min, HRR at two minutes of resting recovery; VTVO2 (ml/kg/min), oxygen consumption per kg of body weight at ventilatory threshold.
*
Sex-adjusted estimates.