Single frequency bioelectrical impedance is a poor method for determining fat mass in moderately obese women

Veronica P Alvarez, John Dixon, Boyd Josef Gimnicher Strauss, Cheryl P Laurie, Timothy Bede Chaston, Paul Edmond O'Brien

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20 Citations (Scopus)


Background: The primary aim of weight loss intervention in obesity is the loss of fat mass (FM). Hence, determinations of changes in FM and fat free mass (FFM) during weight loss are of clinical value. The authors compared the clinical utility of SkinFold Thickness (SKF), tetrapolar bioelectrical impedance analysis (BIA) and a body mass index (BMI) based calculation, in determining changes in percentage of fat mass (Delta FM). Methods: Using dual X-ray absorptiometry (DEXA) measurements of FM as a standard, BIA, SKF and BMI were compared in 41 moderately obese women (BMI 30-35) before and after significant weight lost (-13.9 +/- 5.8 kg). Results: When measuring fat mass loss, SKF was precise and accurate with a bias of +0.86 +/- 6.16 , while the BMI-based estimation had a systematic bias of +6.36 +/- 6.04 (r(2) = 0.791, P
Original languageEnglish
Pages (from-to)211 - 221
Number of pages11
JournalObesity Surgery
Issue number2
Publication statusPublished - 2007

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