Table 4. Main cardiovascular and respiratory and FOT parameters during slow breathing conditions.
| Control (Room air) | 6 breaths∙min-1 | Paired t-test | |
|---|---|---|---|
| Mean RR interval, ms | 814 (109) | 814 (94) | 0.990 |
| RR-SD, ms | 50 (28) | 79 (25) | < 0.001 |
| RMSSD, ms | 47 (26) | 48 (16) | 0.817 |
| SBP, mm Hg | 133 (26) | 132 (24) | 0.483 |
| DBP, mm Hg | 75 (13) | 71 (17) | 0.133 |
| BRS, ms∙mmHg-1 | 12.2 (6.8) | 13.7 (7.4) | 0.263 |
| SaO2, % | 98 (1) | 98 (1) | 0.017 |
| TO2I, % | 65 (10) | 66 (10) | 0.053 |
| R5, cm H2O∙s∙L-1 | 1.70 (0.55) | 1.85 (0.50) | 0.579 |
| R5-IsoVol, cm H2O∙s∙L-1 | - | 2.58 (0.82) | < 0.001 |
| R19, cm H2O∙s∙L-1 | 1.87 (0.61) | 2.09 (0.59) | 0.443 |
| R19-IsoVol, cm H2O∙s∙L-1 | - | 2.59 (0.78) | < 0.001 |
| VT, L | 0.93 (0.17) | 1.92 (0.60) | < 0.001 |
| E, L∙min-1 | 9.98 (2.01) | 11.21 (3.49) | 0.110 |
| CO2-ET, mm Hg | 40.5 (4.02) | 38.82 (3.48) | 0.403 |
RR interval: interval between two RR wave peaks; RR-SD: standard deviation of RR interval; SBP and DBP: systolic and diastolic pressures, respectively; SaO2: oxygen saturation; TO2I: Tissue Oxygen Index; R5 and R19, inspiratory resistance at 5 and 19 Hz, respectively; VT: tidal volume; E: minute ventilation; CO2-ET: carbon dioxide end-tidal. Data are mean ± SD. R5-IsoVol and R19-IsoVol: resistance at 5 and 19 Hz measured at control lung volume.