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Table 3 Cardiopulmonary exercise testing data of the study group

From: Is daily physical activity affected by dynamic hyperinflation in adults with cystic fibrosis?

CPET variables at peak exercise

All (n = 34)

Dynamic hyperinflation (n = 24)

Non-dynamic hyperinflation (n = 10)

p value

Work rate, % of predicted maximum

87.5 ± 18.4

85.2 ± 14.7

93.2 ± 25.2

0.365

V’O2, ml∙min−1∙kg− 1

28.5 ± 4.8

28.7 ± 4.6

27.8 ± 5.6

0.639

V’O2, % of predicted maximum

75.2 ± 13.3

75.2 ± 13.5

75.0 ± 13.4

0.960

HR, beats∙min− 1

155.4 ± 12.4

155.0 ± 12.5

156.3 ± 12.6

0.785

HR, % of predicted maximum

83.3 ± 7.4

83.6 ± 7.9

82.5 ± 6.4

0.697

V’O2/HR, ml∙beat− 1

12.2 ± 3.1

12.9 ± 3.0

10.5 ± 2.5

0.037

SpO2, %

93.6 ± 3.3

93.2 ± 3.4

94.7 ± 3.0

0.254

SpO2Δ, %

−3.2 ± 3.2

−3.5 ± 3.3

−2.5 ± 2.8

0.467

VT, l

1.9 ± 0.6

2.0 ± 0.5

1.6 ± 0.6

0.040

Respiratory rate, breaths∙min− 1

37.8 ± 7.6

37.4 ± 6.7

38.8 ± 10.0

0.655

V’E, l∙min− 1

68.8 ± 19.9

73.2 ± 19.1

58.2 ± 18.7

0.042

BR, %

31.2 ± 19.6

28.8 ± 18.7

36.7 ± 21.6

0.292

V’E/V’CO2 slope

27.4 ± 5.3

28.2 ± 5.9

25.5 ± 2.8

0.181

PETCO2, mmHg

40.1 ± 5.5

39.5 ± 5.8

41.3 ± 4.8

0.304

EELV, l

3.8 ± 1.4

4.3 ± 1.2

2.7 ± 1.3

0.001

EELVΔ, l

0.2 ± 0.6

0.5 ± 0.3

− 0.5 ± 0.6

<  0.001

EELVΔ, % of TLC

2.6 ± 12.5

8.0 ± 5.4

− 10.4 ± 15.3

<  0.001

Dyspnea, modified Borg scale

4.7 ± 2.5

5.1 ± 2.5

4.0 ± 2.4

0.183

Leg discomfort, modified Borg scale

6.3 ± 2.1

6.6 ± 2.2

5.6 ± 1.8

0.223

  1. Definition of abbreviations: CF Cystic Fibrosis, V’O 2 oxygen uptake, HR heart rate, SpO 2 arterial oxygen saturation, V T tidal volume, V’E minute ventilation, BR breathing reserve, V’E/V’CO 2 ventilatory equivalent for carbon dioxide, PET CO2 partial pressure of end-tidal CO2, EELV end-expiratory lung volume, EELVΔ end-expiratory lung volume delta from rest to peak exercise, TLC total lung capacity
  2. Data recorded at peak exercise. Data are presented as mean ± SD, unless otherwise stated. p values are differences between the dynamic hyperinflation and non-dynamic hyperinflation groups