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Prevention of Non Communicable Diseases

Development and cross-validation of predictive equations for fat-free mass and lean soft tissue mass by bioelectrical impedance in Brazilian women

Abstract

Background/Objectives

Bioelectrical impedance is one of the most used clinical techniques to assess body composition; however, it is necessary that the available predictive equations are valid for the evaluated subjects. This study aimed to develop and cross-validate equations for fat-free mass (FFM) and lean soft tissue mass (LSTM) by bioelectrical impedance for Brazilian women, in addition to test the validity of other available equations.

Subjects/Methods

Cross-sectional study with 222 women aged 20–59 years, randomly divided into two groups: development and cross-validation. The standard technique for assessing fat mass, FFM and LSTM was dual energy X-ray absorptiometry. Paired t test, multiple regression, and Bland–Altman plots were used to test the validity of the proposed models, as well as to perform cross-validation of the models.

Results

The equations derived in this study were: FFM = 16.284 + 0.442 × (Height2/Resistance) − 0.13 × age + 0.302 × Weight − 0.121 × Waist Circumference; r2 = 0.86; SEE = 2.32 kg; and LSTM = 14.732 + 0.427 × (Height2/Resistance) − 0.125 × age + 0.291 × Weight − 0.115 × Waist Circumference; r2 = 0.92; SEE = 2.29 kg. In addition, the new equation for FFM showed better agreement when compared to another equation developed for a Brazilian population.

Conclusions

The newly developed equations provide a valid FFM and LSTM estimation and are recommended for Brazilian women with similar characteristics.

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Acknowledgements

The authors would like to thank all volunteers who participated in this study and all students and research assistants who made it possible to complete the study.

Funding

This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brasil (CAPES)—Finance Code 001.

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RFC devised the conceptual idea and study design. RFC and KVSBM were involved in data collection. RFC, AMS, and KVSBM were involved in statistical analysis and drafting the paper. All authors provided critical feedback on the paper. AMS BGATC, and PMSD revised the paper. All authors read and approved the final paper.

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Correspondence to Roberto Fernandes da Costa.

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Costa, R.F.d., Masset, K.V.d.S.B., Silva, A.M. et al. Development and cross-validation of predictive equations for fat-free mass and lean soft tissue mass by bioelectrical impedance in Brazilian women. Eur J Clin Nutr 76, 288–296 (2022). https://doi.org/10.1038/s41430-021-00946-x

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