| Variables | Mean ±SD [reference values] (Gao et al., | 
|---|---|
| Age (year) | 20.6 ± 0.9 | 
| Height (m) | 1.74 ± 0.06 | 
| Weight (kg) | 68.8 ± 8.8 | 
| FVC (l) | 4.60 ± 0.34 [3.75 ± 0.37] | 
| FEV1 (l) | 3.84 ± 0.23 [3.50 ± 0.26] | 
| FEV1 / FVC (%) | 83.7 ± 4.3 [95.6 ±0.1] | 
| 12-s MVV (l·min-1) | 177.9 ± 21.2 [128.1 ±12.9] | 
| V̇O2max (ml·kg-1 ·min-1) | 55.8 ± 5.2 | 
| V̇Emax (l·min-1) | 139.0 ± 19.4 | 
| HRmax (beat·min-1) | 192 ± 9 |