Objective. Evaluating the applicability and validity of the BIA compared to DXA in a population of girls with restrictive anorexia nervosa (AN). Methods. 30 girls (11-19 years old) with AN have been enrolled. Dual-Energy X-ray absorptiometry (DXA) and BIA (BIA software and the Deurenberg equations) have been used to estimate body composition. To determine the best BIA equation compared to the DXA, the sum of the square of differences between estimates of either FFM or FM has been calculated. The correlation between the methods was assessed by Pearson’s correlation coefficient and Bland-Altman method. Results. The mean FFM estimated are: 33.2 kg (BIA software), 32.8 kg (BIA, Deurenberg equation), 33.1 kg (DXA). The mean FM are: 5.6 kg (BIA software), 6.2 kg (BIA, Deurenberg equation), 6.4 kg (DXA). There is a high correlation between FFM estimated with the two methods (BIA software vs DXA r = 0.917 p <0.001; Deurenberg equation vs DXA r = 0.931 p <0.001). The sum of the square of differences between estimates of either FFM or FM is smaller for Deurenberg equation than BIA software. For FFM, the limits of agreement was equal to ± 3.34 kg for BIA software and to ± 2.96 kg for Deurenberg equation. For FM, the limits of agreement was equal to ± 4.60 kg for BIA software and to ± 3.82 kg for Deurenberg equation. Conclusion. The results show a good correlation between DXA and BIA. BIA seems to be a valid alternative for epidemiological and clinical evaluation.
Body composition in subjects with anorexia nervosa: bioelectrical impedance analysis and dual-energy X-ray absorptiometry / Bonaccorsi Guglielmo; Bassetti Andrea; Chiari Sara; Dirindelli Paolo; Lorini Chiara; Menicalli Chiara; Santomauro Francesca; Martinetti Maria Grazia. - In: EATING AND WEIGHT DISORDERS. - ISSN 1124-4909. - STAMPA. - 17:(2012), pp. 298-303.
Body composition in subjects with anorexia nervosa: bioelectrical impedance analysis and dual-energy X-ray absorptiometry
BONACCORSI, GUGLIELMO;LORINI, CHIARA;SANTOMAURO, FRANCESCA;MARTINETTI, MARIA GRAZIA
2012
Abstract
Objective. Evaluating the applicability and validity of the BIA compared to DXA in a population of girls with restrictive anorexia nervosa (AN). Methods. 30 girls (11-19 years old) with AN have been enrolled. Dual-Energy X-ray absorptiometry (DXA) and BIA (BIA software and the Deurenberg equations) have been used to estimate body composition. To determine the best BIA equation compared to the DXA, the sum of the square of differences between estimates of either FFM or FM has been calculated. The correlation between the methods was assessed by Pearson’s correlation coefficient and Bland-Altman method. Results. The mean FFM estimated are: 33.2 kg (BIA software), 32.8 kg (BIA, Deurenberg equation), 33.1 kg (DXA). The mean FM are: 5.6 kg (BIA software), 6.2 kg (BIA, Deurenberg equation), 6.4 kg (DXA). There is a high correlation between FFM estimated with the two methods (BIA software vs DXA r = 0.917 p <0.001; Deurenberg equation vs DXA r = 0.931 p <0.001). The sum of the square of differences between estimates of either FFM or FM is smaller for Deurenberg equation than BIA software. For FFM, the limits of agreement was equal to ± 3.34 kg for BIA software and to ± 2.96 kg for Deurenberg equation. For FM, the limits of agreement was equal to ± 4.60 kg for BIA software and to ± 3.82 kg for Deurenberg equation. Conclusion. The results show a good correlation between DXA and BIA. BIA seems to be a valid alternative for epidemiological and clinical evaluation.I documenti in FLORE sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.