Abstract
Background/objectives:
Obesity and undernutrition co-exist in many regions of Mexico. However, accurate assessments are difficult because epidemiological data on body composition are not available. The aim of this study was to facilitate assessments of body composition in Mexican school children of different geographical regions and ethnicity by developing equations for bioelectrical impedance and anthropometry based on deuterium oxide dilution.
Subjects/methods:
We evaluated 336 subjects (143 belonged to six major indigenous groups) from Northern, Central and Southern Mexico. We measured height (Ht), weight (Wt), tricipital skinfold (Tricp-SKF) and resistance (R) based on a bioimpedance analysis (BIA). Fat-free mass (FFM) and fat mass (FM) were estimated from measurements of total body water with the deuterium dilution technique.
Results:
The final BIA equation was FFM (kg)=0.661 × Ht2/R+0.200 × Wt−0.320. The R2 was 0.96; the square root of the mean square error (SRMSE) was 1.39 kg. The final anthropometric equation was FM (kg)=−1.067 × sex+0.458 × Tricp-SKF+0.263 × Wt−5.407. The R2 was 0.91; SRMSE was 1.60 kg. The BIA equation had a bias of 0.095 kg and precision of 1.43 kg. The anthropometric equation had a bias of 0.047 kg and precision of 1.58 kg.
Conclusions:
We validated two equations for evaluating body composition in Mexican indigenous and non-indigenous children and youth from three main regions of the country. These equations provided reliable estimates and will promote a better understanding of both obesity and undernutrition.
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Acknowledgements
This research was performed at the Centro de Investigación en Alimentación y Desarrollo, AC. We gratefully acknowledge all participants, children and parents, for their collaboration. We also acknowledge the Secretaria de Educación Pública at the national level and the Secretaria de Educacion y Cultura from: Sonora, Chihuahua, Hidalgo, Puebla, Distrito Federal, Chiapas and Yucatan for facilitating access to families. We thank Elena Flores, Alfredo Pérez, Martha Barrera, Luis González, Carmen Vera, Alma Robles, José Ponce and Isabel Gardea for technical assistance. This research was supported by CONACyT, Convocatoria Salud 2003-C01-56 to MEV, a PhD scholarship to ER from the CONACyT, and IAEA (RLA/6/059).
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Ramírez, E., Valencia, M., Bourges, H. et al. Body composition prediction equations based on deuterium oxide dilution method in Mexican children: a national study. Eur J Clin Nutr 66, 1099–1103 (2012). https://doi.org/10.1038/ejcn.2012.89
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DOI: https://doi.org/10.1038/ejcn.2012.89
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