| Outcome measures | Subjects n | Q-statistic | I2 | SES | 95% CI | p-value (z-statistic) | Natural units |
| PI,max | 32 | 57.8 | 46 | 0.73 | 0.53–0.93 | 0.001 | +13 cmH2O |
| RMET | 14 | 47.3 | 73 | 1.05 | 0.62–1.49 | 0.001 | +261 s |
| ITL | 11 | 16.8 | 3 | 0.98 | 0.72–1.25 | 0.001 | +13 cmH2O |
| MVV | 4 | 1.2 | 0 | 0.23 | -0.27–0.72 | 0.373 | +3 L·min−1 |
| Functional exercise capacity | 22 | 14.3 | 0 | 0.28 | 0.12–0.44 | 0.001 | 6MWD: +32 m 12MWD: +85 m |
| Endurance exercise capacity | 3 | 4.6 | 57 | 0.72 | -0.12–1.55 | 0.087 | +198 s |
| V′O2,max L·min−1 | 9 | 6.0 | 0 | -0.13 | -0.38–0.11 | 0.293 | -0.04 L·min−1 |
| V′O2,max mL·min−1·kg−1 | 5 | 5.0 | 20 | 0.3 | -0.02–0.63 | 0.067 | +1.3 mL·min−1·kg−1 |
| V′E,max | 9 | 5.5 | 0 | -0.04 | -0.3–0.2 | 0.696 | -0.7 L·min−1 |
| Wmax | 10 | 5.1 | 0 | 0.07 | -0.16–0.3 | 0.562 | +1.7 W |
| Dyspnoea Borg score | 14 | 15.6 | 17 | -0.45 | -0.66– -0.24 | 0.001 | -0.9 |
| Dyspnoea TDI | 4 | 6.3 | 52 | 1.58 | 0.86–2.3 | 0.001 | +2.8 |
| Dyspnoea CRQ-Dyspnoea | 9 | 16.6 | 52 | 0.34 | -0.03–0.71 | 0.068 | +1.1 |
| Quality of life CRQ | 9 | 10.4 | 20 | 0.34 | 0.09–0.60 | 0.007 | +3.8 |
| CRQ fatigue | 10 | 8.2 | 0 | 0.27 | 0.03–0.50 | 0.024 | +0.9 |
| CRQ emotion | 10 | 7.6 | 0 | 0.19 | -0.04–0.42 | 0.107 | +0.5 |
| CRQ mastery | 10 | 8.5 | 0 | 0.09 | -0.14–0.33 | 0.432 | -0.005 |
n = 32. SES: summary effect size; PI,max: maximal inspiratory pressure; RMET: respiratory muscle endurance test: ITL: incremental threshold loading; MVV: maximal voluntary ventilation; V′O2,max: maximal oxygen uptake; V′E,max: maximal minute ventilation; Wmax: maximal power output; TDI: transition dyspnoea index; CRQ: chronic respiratory questionnaire.