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Titolo:
Validation of a leg-to-leg bioimpedance analysis system in assessing body composition in postmenopausal women
Autore:
Xie, X; Kolthoff, N; Barenholt, O; Nielsen, SP;
Indirizzi:
Hilleroed Hosp, Dept Clin Physiol, DK-3400 Hillerod, Denmark Hilleroed Hosp Hillerod Denmark DK-3400 ysiol, DK-3400 Hillerod, Denmark
Titolo Testata:
INTERNATIONAL JOURNAL OF OBESITY
fascicolo: 10, volume: 23, anno: 1999,
pagine: 1079 - 1084
SICI:
0307-0565(199910)23:10<1079:VOALBA>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
X-RAY ABSORPTIOMETRY; BIOELECTRICAL IMPEDANCE; FAT; ANTHROPOMETRY; SEGMENTS; MASS;
Keywords:
body composition; postmenopausal women; bioelectrical impedance analysis; DXA (Dual energy X-ray absorptiometry); body mass index;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
24
Recensione:
Indirizzi per estratti:
Indirizzo: Xie, X Hilleroed Hosp, Dept Clin Physiol, DK-3400 Hillerod, Denmark Hilleroed Hosp Hillerod Denmark DK-3400 DK-3400 Hillerod, Denmark
Citazione:
X. Xie et al., "Validation of a leg-to-leg bioimpedance analysis system in assessing body composition in postmenopausal women", INT J OBES, 23(10), 1999, pp. 1079-1084

Abstract

OBJECTIVES: To evaluate the validity of a leg-to-leg bioimpedance analysis(BIA) system in predicting body composition as measured by dual-energy X-ray absorptiometry (DXA) in postmenopausal women. SUBJECTS AND METHODS: Body fat mass (FM), %Fat and fat free mass (FFM) were measured in 124 postmenopausal women (age: 51 - 63 y, body mass index (BMI): 17 - 38 kg/m(2)) first by the leg-to-leg BIA system, and then by DXA asreference method. Bland-Altman analysis was used to determine the bias and95% limits of agreement between the two methods for the assessment of the individual. Precision error (CV%) of the BIA system was obtained by repeated measurements with intermediate repositioning. RESULTS: The leg-to-leg BIA system had a high reproducibility with within-day CVs being 0.6% for FFM and 1.1% for FM, and between-day CVs about twicethat. The impedance index (Ht(2)/Z) obtained by the leg-to-leg BIA was moderately correlated to FFM measured by DXA (r=0.66). A significant, systematic bias was observed between the two methods. The BIA system overestimated FM by a mean of 3.1 kg, and underestimated FFM by 2.7 kg. The analysis of 95% limits of agreement showed that for most individuals, %Fat estimated by the BIA might differ from that measured by DXA by 12% below to 45% above, indicating the lack of agreement between the two methods for the assessment of the individual,CONCLUSIONS: The leg-to-leg BIA system can provide simple, rapid and highly reproducible measurements of body composition for groups, but it has limited accuracy for the assessment of the individual. Population-specific equations will be needed to improve its accuracy in estimating body compositionin postmenopausal women.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/12/20 alle ore 17:28:33