Parameter | Spearman (r) | 95% CI | p Value |
EMGdi%max | 0.975 | 0.660 to 0.998 | <0.001 |
sEMGpara%max | 0.975 | 0.660 to 0.998 | <0.001 |
V′o2/kg (ml.min.kg) | 0.975 | 0.660 to 0.998 | <0.001 |
V′o2 (l/min) | 0.975 | 0.660 to 0.998 | <0.001 |
V′co2 (l/min) | 0.975 | 0.660 to 0.998 | <0.001 |
RER | 0.975 | 0.660 to 0.998 | <0.001 |
MV (l/min) | 0.872 | −0.044 to 0.991 | 0.053 |
PTPoes (cm H2O.s.l/min) | 0.872 | −0.044 to 0.991 | 0.053 |
PTPdi (cm H2O.s.l/min) | 0.820 | −0.223 to 0.988 | 0.886 |
TTI | 0.820 | −0.223 to 0.988 | 0.886 |
Petco2 (mm Hg) | −0.658 | −0.975 to 0.535 | 0.227 |
IC (l) | −0.410 | −0.949 to 0.740 | 0.493 |
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′o2, oxygen uptake.