Table 2.
Spirometry and IOS performed by the subjects before (pre) and after (post) exercise with and without HME
| HME | No HME | ||||||
|---|---|---|---|---|---|---|---|
| Pre | Post | p value* | Pre | Post | p value* | p value† | |
| FEV1, L | 4.48 (0.89) | 4.46 (0.89) | 0.235 | 4.47 (0.86) | 4.35 (0.81) | < 0.001 | 0.002 |
| FVC, L | 5.54 (1.12) | 5.45 (1.14) | 0.005 | 5.55 (1.11) | 5.43 (1.11) | 0.001 | 0.268 |
| FEF25, L.s−1 | 8.72 (1.74) | 8.52 (1.76) | 0.166 | 8.57 (1.86) | 7.89 (1.68) | < 0.001 | 0.016 |
| FEF50, L.s−1 | 5.05 (0.98) | 4.98 (1.18) | 0.583 | 5.07 (1.14) | 4.84 (1.04) | 0.021 | 0.338 |
| FEF75, L.s−1 | 1.94 (0.61) | 2.06 (0.68) | 0.064 | 1.94 (0.63) | 1.93 (1.68) | 0.911 | 0.071 |
| R5Hz, kPa/(L.s−1) | 0.309 (0.093) | 0.316 (0.112) | 0.509 | 0.312 (0.099) | 0.319 (0.101) | 0.717 | 0.991 |
| R20Hz, kPa/(L.s−1) | 0.306 (0.090) | 0.303 (0.104) | 0.750 | 0.309 (0.099) | 0.299 (0.812) | 0.424 | 0.714 |
| X5Hz, kPa/(L.s−1) | − 0.072 (0.29) | − 0.071 (0.025) | 0.862 | − 0.073 (0.027) | − 0.073 (0.023) | 0.943 | 0.927 |
| Fres, Hz | 9.638 (2.113) | 9.906 (1.809) | 0.272 | 9.987 (2.722) | 10.347 (1.669) | 0.427 | 0.832 |
Mean (SD). Significant p values in bold
HME heat- and moisture-exchanging breathing mask, FEV1 forced expiratory volume in 1 s, FVC forced vital capacity, FEF25, FEF50, FEF75 forced expiratory flow at 25%, 50% and 75% respectively, R5 Hz resistance at 5 Hz, R20 Hz resistance at 20 Hz, X5 Hz reactance at 5 Hz, Fres resonance, L liters, s second, kPa kilopascal, Hz Hertz
*p value calculated for changes within trials (pre vs post)
†p value calculated for changes between trials (change with HME vs change without HME)