Table 5 Square of the correlation coefficient of parameters related to \(\rm{\dot V}\)E-\(\rm{\dot V}\)co2 slope in COPD patients (n = 122)
From: Gas exchange efficiency slopes to assess exercise tolerance in chronic obstructive pulmonary disease
All COPD patients | GOLD I-II (n = 51) | GOLD III-IV (n = 71) | |
|---|---|---|---|
Peak incremental exercise parameters | |||
Dyspnoea, Borg scale | 0.00 | 0.03 | 0.00 |
\(\rm{\dot V}\)O2, mL ⋅ min−1 ⋅ kg | 0.15 | 0.34 | 0.14 |
\(\rm{\dot V}\)E, L ⋅ min−1 | 0.00 | 0.00 | 0.00 |
VT, mL | 0.04 | 0.07 | 0.06 |
fR, breaths ⋅ min− 1 | 0.05 | 0.04 | 0.06 |
TI/Ttot | 0.00 | 0.02 | 0.00 |
\(\rm{\dot V}\)E/\(\rm{\dot V}\)O2 | 0.57 | 0.55 | 0.60 |
HR, beats ⋅ min− 1 | 0.13 | 0.23 | 0.11 |
O2 pulse, mL ⋅ beats− 1 | 0.08 | 0.13 | 0.06 |
ΔFO2, % | 0.61 | 0.57 | 0.63 |
During exercise | |||
ΔFO2 max., % | 0.55 | 0.69 | 0.45 |
\(\rm{\dot V}\)E/\(\rm{\dot V}\)CO2 nadir | 0.61 | 0.81 | 0.54 |
AT (\(\rm{\dot V}\)O2), mL ⋅ min−1 | 0.07 | 0.14 | 0.09 |
Pulmonary function and others | |||
FEV1, L | 0.00 | 0.04 | 0.00 |
IC, L | 0.00 | 0.01 | 0.00 |
Age, y | 0.00 | 0.00 | 0.01 |
BMI, kg ⋅ m− 2 | 0.02 | 0.00 | 0.04 |