Table 3 Lung function of the patients with chronic obstructive pulmonary disease grouped by the patterns of oxygen pulse (mean ± SD).

Total lung capacity (TLC), L

6.27 ± 0.90

6.94 ± 1.1

6.00 ± 0.80

0.11

0.05

0.79

TLC, pred %

128 ± 20

145 ± 18

123 ± 18

0.02

0.01

0.82

Functional residual capacity (FRC), L

4.49 ± 0.75

5.22 ± 1.19

4.36 ± 0.62

0.07

0.08

0.94

Residual volume (RV), L

3.52 ± 0.62

4.11 ± 1.10

3.40 ± 0.54

0.11

0.10

0.94

Inspiratory capacity/TLC < 25%,n/subtotal n

3/16

12/20

2/9

0.01

0.06

0.83

Diffusing capacity for carbon monoxide, pred %

85 ± 19

57 ± 17

68 ± 5

<0.0001

0.27

0.06

Forced vital capacity (FVC), pred %

76 ± 22

88 ± 17

75 ± 23

0.19

0.24

0.98

Forced expired volume in one second (FEV₁), pred%

49 ± 14

54 ± 22

46 ± 18

0.63

0.56

0.96

                  Stage 1, n=

0

3

0

                  Stage 2, n=

7

7

4

0.73^F

0.73^F

                  Stage 3, n=

7

8

3

                  Stage 4, n=

2

2

2

FEV₁/FVC

0.52 ± 0.12

0.48 ± 0.16

0.47 ± 0.07

0.66

0.98

0.66

Maximum inspiratory pressure (MIP), cm H₂O

73 ± 21

67 ± 16

65 ± 18

0.64

0.96

0.58

Maximum expiratory pressure (MEP), cm H₂O

113 ± 29

95 ± 13

103 ± 21

0.07

0.69

0.51

ΔMIP post-pre exercise, cm H₂O

14 ± 19

0 ± 9

5 ± 18

0.05

0.74

0.33

ΔMEP post-pre exercise, cm H₂O

5 ± 21

3 ± 16

−3 ± 11

0.92

0.67

0.49