Parameter | Spearman (r) | 95% CI | p Value |
EMGdi%max | 0.906 | 0.483 to 0.986 | <0.001 |
sEMGpara%max | 0.906 | 0.483 to 0.986 | <0.001 |
MV (l/min) | 0.906 | 0.483 to 0.986 | <0.001 |
V′o2/kg (ml.min.kg) | 0.906 | 0.483 to 0.986 | <0.001 |
PTPdi (cm H2O.s.l/min) | 0.906 | 0.483 to 0.986 | <0.001 |
PTPoes (cm H2O.s.l/min) | 0.906 | 0.483 to 0.986 | <0.001 |
TTI | 0.906 | 0.483 to 0.986 | <0.001 |
V′co2 (l/min) | 0.906 | 0.483 to 0.986 | <0.001 |
Petco2 (mm Hg) | 0.906 | 0.483 to 0.986 | <0.001 |
RER | 0.709 | −0.094 to 0.953 | 0.074 |
IC (l) | −0.869 | −0.980 to −0.328 | 0.012 |
EMG, electromyogram; EMGdi%max, diaphragm EMG activity normalised to maximal evoked EMG during inspiratory manoeuvres; IC, inspiratory capacity; MV, minute ventilation; Petco2, end tidal carbon dioxide; PTPoes, oesophageal pressure time product; PTPdi, diaphragm pressure time product; RER, respiratory exchange ratio; sEMGpara%max, surface parasternal EMG activity normalised to maximal evoked EMG during inspiratory manoeuvres; TTI, tension time index; V′co2, carbon dioxide production; V′o-2, oxygen uptake.