Table 2.
Results of Baseline Respiratory Impedance at Rest (n=55)
| R5, cmH2O/L/s | ||
| Inspiratory | 3.62 (1.30) | 1.20–6.96 |
| Expiratory | 4.88 (2.19) | 1.53–13.83 |
| Average | 4.25 (1.64) | 1.54–10.04 |
| ΔR5 | −1.26 (1.50) | −7.59–1.19 |
| R20, cmH2O/L/s | ||
| Inspiratory | 2.74 (0.80) | 1.13–4.75 |
| Expiratory | 3.32 (1.28) | 1.44–7.94 |
| Average | 3.03 (0.96) | 1.49–6.08 |
| ΔR20 | −0.58 (0.91) | −3.76–0.77 |
| R5-R20, cmH2O/L/s | ||
| Inspiratory | 0.89 (0.60) | −0.07–2.80 |
| Expiratory | 1.56 (0.99) | 0.01–5.89 |
| Average | 1.23 (0.74) | 0.01–3.96 |
| ΔR5-R20 | −0.68 (0.71) | −3.86–0.52 |
| X5, cmH2O/L/s | ||
| Inspiratory | −1.29 (0.85) | −3.55 - −0.16 |
| Expiratory | −3.64 (3.12) | −12.56 - −0.08 |
| Average | −2.47 (1.89) | −7.54 - −0.13 |
| ΔX5 | 2.36 (2.58) | −0.16–10.05 |
| Fres, Hz | ||
| Inspiratory | 14.53 (5.81) | 5.91–30.60 |
| Expiratory | 20.08 (7.81) | 5.56–34.28 |
| Average | 17.31 (6.47) | 5.74–32.18 |
| ΔFres | −5.55 (4.65) | −18.51–1.04 |
| ALX, cmH2O/L/s × Hz | ||
| Inspiratory | 9.32 (9.12) | 0.54–42.08 |
| Expiratory | 33.74 (33.57) | 0.29–145.30 |
| Average | 21.53 (20.14) | 0.46–83.41 |
| ΔALX | −24.41 (28.24) | −123.78–0.92 |
Note: Data are presented as the mean (SD) and the minimum and maximum values, unless otherwise stated.
Abbreviations: ALX, low-frequency reactance area; Δ, difference between inspiratory and expiratory phases; Fres, resonant frequency; R5 and R20, respiratory system resistance at 5 and 20 Hz, respectively; SD, standard deviation; X5, respiratory system reactance at 5 Hz.