Skip to main content

Table 3 Correlations between changes in 6MWD with diaphragm excursion and baseline characteristics

From: Diaphragmatic excursion is correlated with the improvement in exercise tolerance after pulmonary rehabilitation in patients with chronic obstructive pulmonary disease

Independent variable

Total patients (n = 50)

Pearson correlation

p value

coefficient (r)

Age, year

 − 0.10

0.48

BMI, kg/m2

 − 0.02

0.89

CAT

 − 0.34

0.017

FVC %predicted

0.19

0.18

FEV1 %predicted

0.45

0.001

6MWD, m

0.28

0.052

mBorg scale dyspnoea

 − 0.34

0.017

PImax, cmH2O

0.58

< 0.001

DEmax, mm

0.72

< 0.001

QMS, kgf/kg

0.31

0.028

  1. BMI body mass index, CAT COPD assessment test, FVC forced vital capacity, FEV1 forced expiratory volume in 1 s, 6MWD 6-min walk distance, mBorg modified Borg, PImax maximum inspiratory pressure, DEmax maximum diaphragmatic excursion, QMS quadriceps muscle strength