title: [Bioelectrical impedance analysis of body composition in patients with pulmonary emphysema].
abstract: In this study we utilized bioelectrical impedance analysis (BIA) to compare the body composition of 36 stable pulmonary emphysema (PE) patients with 19 healthy controls. We compared the PE patients and healthy controls in terms of fat-free mass (FFM) and body fat (BF) as percentages of ideal body weight (FFM/IBW, BF/IBW). FFM/IBW and BF/IBW were significantly lower in the PE patients than in the controls (75.0 +/- 9.8% vs. 85.2 +/- 7.3%, p < 0.001 and 11.8 +/- 6.4% vs. 16.7 +/- 7.7%, p < 0.05, respectively). We divided the PE patients into two subgroups according to FFM, then investigated the relationships between FFM and skeletal muscle strength, and between FFM and respiratory muscle strength. In patients with reduced FFM (FFM < 43.5 kg) grip strength as an index of skeletal muscle strength was significantly lower than in patients without reduced FFM (FFM > or = 43.5 kg) (25.7 +/- 7.8 kg vs. 36.2 +/- 7.2 kg, p < 0.005). As indexes of respiratory muscle strength, maximal expiratory pressure (PEmax) and maximal inspiratory pressure (PImax) were lower in the patients with reduced of FFM, but not to a statistically significant degree (49.6 +/- 20.8 cm H2O vs. 58.7 +/- 23.9 cm H2O and 40.5 +/- 19.2 cm H2O vs. 50.2 +/- 22.1 cm H2O, respectively). In the PE patients, FFM correlated closely with vital capacity (r = 0.528, p < 0.001), forced vital capacity (FVC) (r = 0.531, p < 0.001), FEV1.0 (r = 0.554, p < 0.001), FEV1.0/FVC (r = 0.467, p < 0.005), RV/TLC (r = -0.395, p < 0.05), DLco (r = 0.770, p < 0.001), and DLco/VA (r = 0.622, p < 0.001). However no correlation was observed between BF and any of the measures of lung function. The findings of our study suggest that FFM correlates with skeletal muscle strength, respiratory muscle strength and some measures of lung function in patients with PE, and that assessments of body composition are valuable to their clinical management.
authors.affiliation: Second Department of Internal Medicine, Nara Medical University, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Takenaka
authors.forename: T
authors.initials: T
authors.lastname: Yoneda
authors.lastname: Masahiro
authors.forename: Y A
authors.initials: YA
authors.lastname: Fu
authors.forename: A
authors.initials: A
authors.lastname: Kobayashi
authors.forename: M
authors.initials: M
authors.lastname: Ikuno
authors.forename: K
authors.initials: K
authors.lastname: Tsukaguchi
authors.forename: Y
authors.initials: Y
authors.lastname: Okamoto
authors.forename: C
authors.initials: C
authors.lastname: Yamamoto
authors.forename: N
authors.initials: N
authors.lastname: Narita
mesh_terms: D000368:Aged; D001823:Body Composition; D017097:Electric Impedance; D006801:Humans; D008176:Lung Volume Measurements; D008297:Male; D008875:Middle Aged; D009752:Nutritional Status; D011656:Pulmonary Emphysema / Q000503:physiopathology*