Table 4.
Analysis of CPET variables in AF and non-AF groups.
| Sinus rhythm | Atrial fibrillation | p | |
|---|---|---|---|
| RER | 1.090 (1.00–1.14) | 0.965 (0.94–1.05) | 0.001 |
| Predicted VO2max (%) | 70.0 (58.0–81.0) | 62.5 (45.0–68.0) | 0.010 |
| VO2max (L/min) | 1.26 (0.98–1.68) | 0.92 (0.7–1.2) | 0.016 |
| VO2max/kg (mL/min/kg) | 15 (12–19) | 11 (9–14) | <0.001 |
| VO2 AT (L/min) | 1.00 (0.76–1.19) | 0.735 (0.67–0.96) | 0.033 |
| VE/VO2 | 32.70 (29.6–39.6) | 34.55 (30.9–39.8) | 0.655 |
| VE/VCO2 | 32.20 (27.3–35.3) | 33.85 (31.2–41.1) | 0.049 |
| VCO2 slope | 31.2 (26.0–37.2) | 34.6 (30.9–39.8) | 0.052 |
| VO2/HR peak (mL/bpm) | 11 (9–13) | 8.5 (7–12) | 0.038 |
Data are given as median (interquartile range) unless otherwise indicated. A p-value of <0.05 is considered statistically significant.
RER, respiratory exchange ratio; VO2max, maximal oxygen consumption; VO2, oxygen uptake; AT, anaerobic threshold; VE, minute ventilation; VCO2, CO2 output; VE/VO2, ventilatory equivalent for O2; VE/VCO2, ventilatory equivalent for CO2; VO2/HR, peak VO2 divided by the heart rate. Bold values are statistically significant data.