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Validity of formulas used in bioelectrical impedance analysis: which is most accurate in predicting changing amounts of fat mass during weight loss?

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Validity of formulas used in bioelectrical impedance analysis: which is most accurate in predicting changing amounts of fat mass during weight loss?

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Background The aim of this study is to validate predictive equations for bioelectrical impedance using air displacement plethysmography (ADP) as reference method to assess changes in fat mass (FM) during weight loss. The study of body composition in overweight populations during weight loss by techniques such as bioelectrical impedance analysis (BIA) and bioelectrical impedance spectroscopy (BIS) requires validation based on standard reference methods. Methods This study included 81 male and 192 female subjects, 16–76 years of age, with a BMI between 25 kg/m2 and 35 kg/m2. Body composition was measured by BodPod, Tanita BC- 418 and BodyScout. Body weight (WT, kg) and height (HTM, m) were obtained by standard anthropometric techniques. Impedance (Imp, ), Resistance, (R, ) and reactance, (Xc, ) were also measured. PubMed was used for a systematic search for BIA formulas. By using the % correct predictions (within 20% of reference value), RMSE, Concordance Correlation Coefficient, and Bland and Altman approach the formulas were tested on accuracy and precision. Results en Discussion In total 20 formulas were found in literature and tested for validity. Also the measured FM according to the Tanita BC-418 and BodyScout were tested on validity. Almost all formulas predicted more than 50% of the change in FM lower than 20% within the measured value from the BodPod. The formulas of Kyle et al. 2003, Gray et al. 1985 and Segal et al. A and B 1985 predicted, within 20% of the measured value, respectively 17.3%, 21.1%, 21.0% and 23.0% correct. Values from the Tanita BC-418 and BodyScout were also compared to the BodPod. The BodyScout had better results than the Tanita BC-418 with a Bias of 0.1±5.1, a RMSE of 0.004 and 11.8% accurate measurements within 20% of the measured value from the BodPod. Conclusion The examined formulas are not valid when used to predict changes in fat mass when into weight loss. Within the examined formulas the predictions of Kyle et al. 2003, Gray et al. A 1989 and Segal et al. A and B 1985 performed best in predicting changes in FM. A new equation for subjects into weight loss, which compensates for the loss of water bound glycogen, should be developed to accurately predict changes in fat mass.

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OrganisatieHogeschool van Amsterdam
InstituutBewegen, Sport en Voeding
Gepubliceerd in
Jaar2010
TypeBachelorscriptie
TaalEngels

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