Validity of bioelectrical impedance analysis to estimate body composition changes after bariatric surgery in premenopausal morbidly women

Silvia Savastano, Annamaria Belfiore, Carolina Di Somma, Concetta Mauriello, Annalisa Rossi, Genoveffa Pizza, Annalba De Rosa, Giovanni Prestieri, Luigi Angrisani, Annamaria Colao

Research output: Contribution to journalArticlepeer-review


In obese patients, subtle variations of the hydration of soft tissues can propagate errors in bioelectrical impedance analysis (BIA) measures of body composition. Bioelectrical impedance vector analysis (BIVA) is a useful method to evaluate tissue hydration. Laparoscopic adjustable gastric banding (LAGB) is a purely restrictive bariatric surgical procedure resulting in lower fat-free mass (FFM) loss than other malabsorptive or mixed intervention. The aim of this study was to evaluate the 6- and 12-month changes in body composition in a homogeneous group of premenopausal morbidly obese women treated by LAGB by comparing the results of conventional BIA and BIVA with dual-energy X-ray absorptiometry (DXA) method. Forty-five consecutive morbidly obese patients (mean age, 35.3±9.1 years; body mass index, 34.5-48.7 kg/m2) were prospectively evaluated at the Endocrinology Unit of the Department of Molecular and Clinical Endocrinology and Oncology. The LAGB device (Lap-Band™ System; Inamed Health, Santa Barbara, CA, USA) was inserted laparoscopically. Soft tissue hydration was evaluated by BIVA; fat mass (FM) and FFM were evaluated by BIA (BIA 101 RJL, Akern Bioresearch, Firenze, Italy) and by DXA (Hologic QDR 4500A S/N 45622; Hologic Inc., Bedford, MA, USA). Pre- and postoperative BIVA vectors indicated a normal hydration in all patients. Postoperatively, the excess of body weight loss was mainly due to a decrease in FM. The regression analysis of BIA and DXA methods at baseline and at the 6- and 12-month follow-up for FM r 2 values were 0.98, 0.94, and 0.99, respectively (p2 values were 0.91, 0.89, and 0.98, respectively (p2 values were 0.87, 0.82, 0.99, respectively (p

Original languageEnglish
Pages (from-to)332-339
Number of pages8
JournalObesity Surgery
Issue number3
Publication statusPublished - Mar 2010


  • BIA
  • Body composition changes
  • DXA
  • LAGB
  • Morbid obesity

ASJC Scopus subject areas

  • Surgery
  • Endocrinology, Diabetes and Metabolism
  • Nutrition and Dietetics


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