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Table 2 Lung function and exercise responses of patients with COPD classified by difference between VC and FVC

From: Increased difference between slow and forced vital capacity is associated with reduced exercise tolerance in COPD patients

 

VC > FVC

VC ≤ FVC

p-value

Patients, n

77

20

 

Age, yr

65±8.2

62±7.7

0.187

VC-FVC, † L

0.16 (0.07-0.27)

-0.20 (-0.30--0.03)

<0.001

FEV1, L

1.21±0.46

1.67±0.68

0.008

FEV1, % predicted

46.41±16.13

58.26±22.44

0.009

FEV1/FVC, %

49.29±10.49

54.89±10.54

0.036

Peak VO2, ml/min/kg

13.26±3.92

18.99±5.75

<0.001

Peak work rate, watts

68.53±34.45

85.10±34.74

0.059

Peak HR, beats/min

128±16

128±11

0.983

  1. Data with normal distribution are presented as mean ± SD.
  2. †: Expressed as median (interquartile range).
  3. VC = vital capacity; FVC = forced vital capacity; FEV1 = forced expiratory volume in one second; VC-FVC = difference between VC and FVC; VO2 = oxygen uptake; HR = heart rate.
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BMC Pulmonary Medicine

ISSN: 1471-2466

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