Table 1. Chronological changes in PImax and PEmax.
| PImax | PEmax | |||
| Under inspiratory load | No inspiratory load | Under inspiratory load | No inspiratory load | |
| Pre-load | 112.7 ± 22.0 | 121.2 ± 18.0 | 89.3 ± 17.5 | 96.4 ± 20.3 |
| 2 min | 106.8 ± 28.8 | 112.8 ± 21.4 | 84.2 ± 17.9 | 90.9 ± 19.9 |
| 4 min | 102.4 ± 27.3 | 118.3 ± 21.6 | 78.5 ± 23.6 | 92.4 ± 20.4 |
| 6 min | 101.6 ± 26.7 | 117.3 ± 18.8 | 85.4 ± 19.6 | 93.9 ± 18.7 |
| 8 min | 101.2 ± 26.6 | 119.4 ± 21.7 | 82.7 ± 21.1 | 94.2 ± 21.0 |
| 10 min | 101.4 ± 23.4 | 118.1 ± 19.0 | 80.1 ± 20.8 | 91.2 ± 21.0 |
| 12 min | 100.5 ± 23.3 | 120.0 ± 20.9 | 79.6 ± 24.0 | 91.3 ± 21.1 |
| 14 min | 97.7 ± 24.1* | 121.9 ± 22.8 | 76.7 ± 23.3* | 93.0 ± 22.2 |
| 16 min | 98.5 ± 26.7* | 119.2 ± 21.0 | 78.2 ± 20.7 | 93.0 ± 18.6 |
| 18 min | 97.7 ± 24.6* | 120.3 ± 18.1 | 75.9 ± 21.5* | 94.9 ± 17.6 |
| 20 min | 90.7 ± 22.5* | 123.3 ± 20.1 | 72.6 ± 21.3* | 93.0 ± 21.3 |
| 5 min rest | 105.2 ± 22.3 | 120.4 ± 22.6 | 80.9 ± 18.7 | 92.1 ± 21.1 |
| 10 min rest | 103.4 ± 20.0 | 117.9 ± 22.4 | 82.3 ± 17.5 | 93.0 ± 20.5 |
| 15 min rest | 109.7 ± 20.5† | 121.3 ± 17.7 | 83.8 ± 18.5 | 93.2 ± 21.1 |
| 20 min rest | 108.5 ± 19.0† | 118.4 ± 20.6 | 83.6 ± 16.7 | 92.1 ± 20.1 |
| 25 min rest | 110.5 ± 14.9† | 125.2 ± 18.0 | 81.9 ± 19.0 | 95.9 ± 19.6 |
| 30 min rest | 114.2 ± 18.9† | 127.4 ± 20.2 | 85.5 ± 18.7† | 97.0 ± 19.3 |
Unit: cmH2O (mean ± standard deviation), n=14.
*p<0.05 (Comparison with pre-load), †p<0.05 (Comparison with +20 min load and rest).
PImax: maximal inspiratory mouth pressure; PEmax: maximal expiratory mouth pressure.