Table 2.
Results of cardiorespiratory exercise testing of the patient before and during KD.
| Before KD | KD 3 months | KD 8 months | KD 5 years | Control subjects (N = 4) mean (SD) | |
|---|---|---|---|---|---|
| Heart rate maximum percentage of predicted (%)* | 98.3 | 94.6 | 94.9 | 94.8 | 97.9 (4.6) |
| Borg subjective scale 6–20 | 19 | 19 | 17 | 20 | 18.3 (2.1) |
| RQ (V′CO2/V′O2) in maximal exercise | 0.91 | 0.88 | 0.92 | 0.75 | 1.13 (0.05) |
| Wmax/3 min (maximal working capacity) (W) | 93 | 90 | 99 | 102 | 285.2 (81) |
| V′O2 max (maximal oxygen uptake) (L/min) | 2.045 | 1.838 | 2.159 | 1.778 | 3.79 (1.1) |
| V′O2/kg max (maximal oxygen uptake/weight) (ml/min/kg) | 28.8 | 25.9 | 34.8 | 30.7 | 52.1 (12.1) |
| Wmax/V′O2 max (%) | 13.1 | 11.1 | 14.1 | 16.5 | 21.7 (1.4) |
| Breathing frequency | 68 | 61 | 56 | 46 | 43.0 (12.8) |
| Tidal volume, % of predicted | 44.6 | 41.7 | 56.1 | 60.3 | 109.8 (24.8) |
| Fraction of end tidal CO2 (FetCO2) (%) | 4.16 | 3.82 | 3.8 | 4.0 | 5.4 (0.51) |
RQ, respiratory quotient; V′CO2 is maximal CO2 production.
*
205–0.5 × age.