Measurement of body composition in 810-year-old African-American girls

A comparison of dual-energy X-ray absorptiometry and foot-to-foot bioimpedance methods

Barbara S. McClanahan, Michelle B. Stockton, Jennifer Q. Lanctot, George Relyea, Robert Klesges, Deborah L. Slawson, Leslie P. Schilling

Research output: Contribution to journalArticle

17 Citations (Scopus)

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, 810-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.

Original languageEnglish (US)
Pages (from-to)389-396
Number of pages8
JournalInternational Journal of Pediatric Obesity
Volume4
Issue number4
DOIs
StatePublished - Nov 30 2009

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Photon Absorptiometry
Body Composition
African Americans
Foot
Fats
Electric Impedance
X-Rays
Adipose Tissue
Population

All Science Journal Classification (ASJC) codes

  • Pediatrics, Perinatology, and Child Health
  • Health Policy
  • Nutrition and Dietetics
  • Public Health, Environmental and Occupational Health

Cite this

Measurement of body composition in 810-year-old African-American girls : A comparison of dual-energy X-ray absorptiometry and foot-to-foot bioimpedance methods. / McClanahan, Barbara S.; Stockton, Michelle B.; Lanctot, Jennifer Q.; Relyea, George; Klesges, Robert; Slawson, Deborah L.; Schilling, Leslie P.

In: International Journal of Pediatric Obesity, Vol. 4, No. 4, 30.11.2009, p. 389-396.

Research output: Contribution to journalArticle

McClanahan, Barbara S. ; Stockton, Michelle B. ; Lanctot, Jennifer Q. ; Relyea, George ; Klesges, Robert ; Slawson, Deborah L. ; Schilling, Leslie P. / Measurement of body composition in 810-year-old African-American girls : A comparison of dual-energy X-ray absorptiometry and foot-to-foot bioimpedance methods. In: International Journal of Pediatric Obesity. 2009 ; Vol. 4, No. 4. pp. 389-396.
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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, 810-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.",
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