Baseline characteristics of participants
| Characteristics | Unloaded breathing first (n=20) | Loaded breathing first (n=20) | Total (n=40) |
| Age years | 26.35±4.94 | 26.60±5.14 | 26.48±4.98 |
| Male sex | 11 (55) | 13 (65) | 24 (60) |
| BMI kg·m−2 | 23.50±4.00 | 22.98±3.73 | 23.24±3.82 |
| FEV1/FVC % predicted | 101.15±6.23 | 102.45±8.20 | 101.80±7.22 |
| FEV1 % predicted | 100.40±11.25 | 101.30±12.45 | 100.85±11.72 |
| MIP cmH2O | 111.65±24.34 | 106.65±25.86 | 109.15±24.92 |
| SNIP cmH2O | 104.00±25.02 | 86.75±20.82 | 95.38±24.34 |
| Inspiratory load# | 5.92±2.28 | 4.33±2.52 | 5.12±2.51 |
Data are presented as n (%) or mean±sd. BMI: body mass index; FEV1: forced expiratory volume in 1 s; FVC: forced vital capacity; MIP: maximal inspiratory pressure; SNIP: sniff nasal inspiratory pressure; sd: standard deviation. #: level of inspiratory load provided by the Powerbreathe® device (from 1 to 9).