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Measurement of body composition in 8-10-year-old African-American girls: a comparison of dual-energy X-ray absorptiometry and foot-to-foot bioimpedance methods.
Int J Pediatr Obes. 2009; 4(4):389-96.IJ

Abstract

OBJECTIVE

The purpose of this study was to evaluate body composition outcomes of foot-to-foot (FF) bioelectrical impedance (BIA) and dual-energy x-ray (DEXA) in 8 to 10-year-old African-American girls and, if different, to develop and cross-validate specific BIA prediction equations for this at-risk group.

METHODS

DEXA and FF-BIA body composition outcomes were analyzed in 183, 8-10-year-old African-American girls from the Memphis site of the Girls health Enrichment Multi-site Study (GEMS).

RESULTS

Mean body composition outcomes by FF-BIA and DEXA were significantly different (p<0.0001); therefore, population-specific equations were developed and cross-validated using split-sample, cross-validation methods. When equations were used, BIA and DEXA outcomes were significantly correlated (percent body fat [r=0.931], fat mass [r=0.985], and fat-free mass [r=0.944]). Mean predicted BIA measurements for body fat, fat mass, and fat-free mass were essentially equal to their counterpart DEXA measurements (t[182]=- 0.013, p = 0.897, t[182]=- 0.06, p=0.956, and t[182]=- 0.26, p=0.792, respectively). The Bland-Altman analysis revealed a significant slope for percent fat (p=0.009) and slopes approaching significance for fat mass (p=0.07) and fat-free mass (p=0.06).

CONCLUSION

Although FF-BIA and DEXA are not directly interchangeable in young African-American girls, these equations accurately estimated average percent fat, fat mass, and fat-free mass of the cross-validation sample of African-American girls. However, the application of this equation may result in potential underestimation or overestimation of fat with respect to DEXA measures in some populations.

Authors+Show Affiliations

Department of Health and Sport Sciences, University of Memphis, Memphis, TN 38152, USA. bmcclnhn@memphis.eduNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article
Research Support, N.I.H., Extramural
Validation Study

Language

eng

PubMed ID

19922056

Citation

McClanahan, Barbara S., et al. "Measurement of Body Composition in 8-10-year-old African-American Girls: a Comparison of Dual-energy X-ray Absorptiometry and Foot-to-foot Bioimpedance Methods." International Journal of Pediatric Obesity : IJPO : an Official Journal of the International Association for the Study of Obesity, vol. 4, no. 4, 2009, pp. 389-96.
McClanahan BS, Stockton MB, Lanctot JQ, et al. Measurement of body composition in 8-10-year-old African-American girls: a comparison of dual-energy X-ray absorptiometry and foot-to-foot bioimpedance methods. Int J Pediatr Obes. 2009;4(4):389-96.
McClanahan, B. S., Stockton, M. B., Lanctot, J. Q., Relyea, G., Klesges, R. C., Slawson, D. L., & Schilling, L. P. (2009). Measurement of body composition in 8-10-year-old African-American girls: a comparison of dual-energy X-ray absorptiometry and foot-to-foot bioimpedance methods. International Journal of Pediatric Obesity : IJPO : an Official Journal of the International Association for the Study of Obesity, 4(4), 389-96. https://doi.org/10.3109/17477160902763358
McClanahan BS, et al. Measurement of Body Composition in 8-10-year-old African-American Girls: a Comparison of Dual-energy X-ray Absorptiometry and Foot-to-foot Bioimpedance Methods. Int J Pediatr Obes. 2009;4(4):389-96. PubMed PMID: 19922056.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Measurement of body composition in 8-10-year-old African-American girls: a comparison of dual-energy X-ray absorptiometry and foot-to-foot bioimpedance methods. AU - McClanahan,Barbara S, AU - Stockton,Michelle B, AU - Lanctot,Jennifer Q, AU - Relyea,George, AU - Klesges,Robert C, AU - Slawson,Deborah L, AU - Schilling,Leslie P, PY - 2009/11/20/entrez PY - 2009/11/20/pubmed PY - 2010/1/29/medline SP - 389 EP - 96 JF - International journal of pediatric obesity : IJPO : an official journal of the International Association for the Study of Obesity JO - Int J Pediatr Obes VL - 4 IS - 4 N2 - OBJECTIVE: The purpose of this study was to evaluate body composition outcomes of foot-to-foot (FF) bioelectrical impedance (BIA) and dual-energy x-ray (DEXA) in 8 to 10-year-old African-American girls and, if different, to develop and cross-validate specific BIA prediction equations for this at-risk group. METHODS: DEXA and FF-BIA body composition outcomes were analyzed in 183, 8-10-year-old African-American girls from the Memphis site of the Girls health Enrichment Multi-site Study (GEMS). RESULTS: Mean body composition outcomes by FF-BIA and DEXA were significantly different (p<0.0001); therefore, population-specific equations were developed and cross-validated using split-sample, cross-validation methods. When equations were used, BIA and DEXA outcomes were significantly correlated (percent body fat [r=0.931], fat mass [r=0.985], and fat-free mass [r=0.944]). Mean predicted BIA measurements for body fat, fat mass, and fat-free mass were essentially equal to their counterpart DEXA measurements (t[182]=- 0.013, p = 0.897, t[182]=- 0.06, p=0.956, and t[182]=- 0.26, p=0.792, respectively). The Bland-Altman analysis revealed a significant slope for percent fat (p=0.009) and slopes approaching significance for fat mass (p=0.07) and fat-free mass (p=0.06). CONCLUSION: Although FF-BIA and DEXA are not directly interchangeable in young African-American girls, these equations accurately estimated average percent fat, fat mass, and fat-free mass of the cross-validation sample of African-American girls. However, the application of this equation may result in potential underestimation or overestimation of fat with respect to DEXA measures in some populations. SN - 1747-7174 UR - https://www.unboundmedicine.com/medline/citation/19922056/Measurement_of_body_composition_in_8_10_year_old_African_American_girls:_a_comparison_of_dual_energy_X_ray_absorptiometry_and_foot_to_foot_bioimpedance_methods_ L2 - https://doi.org/10.3109/17477160902763358 DB - PRIME DP - Unbound Medicine ER -