Table 2. Comparison of exercise testing variables at end of exercise between IET and CET.
| Variables | IET | CET |
|---|---|---|
| VO2 (L/min) | 2.55±0.47 | 2.63±0.41 |
| VCO2 (L/min) | 2.92±0.43 | 2.71±0.37* |
| VE (L/min) | 68.9±12.3 | 67.5±12.1 |
| VE/VCO2 | 24.8±3.18 | 26.7±2.92* |
| VD/VT | 0.11±0.03 | 0.13±0.04* |
| PETCO2 | 45.2±6.26 | 42.5±4.30* |
| RER | 1.17±0.10 | 1.21±0.12 |
| HR (bpm) | 185.3±8.58 | 186.5±5.01 |
| SBP (mmHg) | 199.09±16.67 | 186.01±24.27* |
| SV (ml) | 96.93±17.85 | 82.2±20.07 |
| CO (L/min) | 16.1±3.23 | 13.23±3.02* |
| TPR | 0.68±0.28 | 0.57±0.25 |
| O2Hb (A.U.) | 7.63±1.68 | 7.24±1.88 |
| HHb (A.U.) | 9.07±2.86 | 9.53±2.74** |
| THb (A.U.) | 16.8±2.90 | 16.77±3.21 |
| SmO2 (%) | 46.4±0.09 | 43.6±0.09** |
p value of the paired t-test: *p<0.05, **p<0.01. Variables are presented as mean±SD. Each value was obtained at the end of exercise. IET: incremental exercise test, CET: constant high-intensity exercise test, VO2: oxygen uptake, VCO2: carbon dioxide output, VE: minute ventilation, VE/VCO2: ventilator equivalent for carbon dioxide, VD/VT: ratio of dead space to tidal volume, PETCO2: end-tidal carbon dioxide pressure, RER: respiratory exchange ratio, HR: heart rate, SBP: arterial blood pressure, SV: stroke volume, CO: cardiac output, O2Hb: oxygenated hemoglobin, HHb: deoxygenated hemoglobin, THb: total hemoglobin, SmO2: muscle oxygen saturation