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Body composition determination in children using bioelectrical impedance.

L Cordain1, R E Whicker, J E Johnson

  • 1Department of Exercise and Sport Science, Colorado State University, Fort Collins 80523.

Growth, Development, and Aging : GDA
|January 1, 1988
PubMed
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Bioelectrical impedance analysis, a method for estimating body composition, is reliable for children. This technique accurately predicts fat-free mass (FFM) in pediatric populations, offering a valid and dependable assessment tool.

Area of Science:

  • Pediatric Physiology
  • Body Composition Analysis
  • Bioelectrical Impedance Analysis

Background:

  • Tetrapolar bioelectrical resistive impedance (R) is a recently validated method for estimating body composition in adults.
  • Its applicability and reliability in pediatric populations require thorough evaluation.

Purpose of the Study:

  • To assess the validity and reliability of tetrapolar bioelectrical resistive impedance (R) for estimating body composition in children.
  • To establish predictive equations for fat-free mass (FFM) using impedance measurements in a pediatric cohort.

Main Methods:

  • 16 girls (11.6 +/- 0.9 yr) and 14 boys (12.5 +/- 1.0 yr) participated in the study.
  • Body composition was assessed using hydrostatic weighing for fat-free mass (FFM) and whole-body counting of 40K for total body potassium (TBK).

Related Experiment Videos

  • Resistive impedance (R) was measured using an electrical impedance plethysmograph.

    • Main Results:

    • Significant strong correlations were found between TBK and height squared divided by resistance (ht2/R) (r = 0.92, P < 0.001).
    • Similarly, significant strong correlations were observed between FFM and ht2/R (r = 0.83, P < 0.001).
    • The reliability coefficient for impedance measurements was high (r = 0.97).

    Conclusions:

    • Bioelectrical impedance measurements demonstrate validity and reliability as predictors of FFM in pediatric populations.
    • The derived equation FFM (kg) = 6.86 + 0.81 x (ht2/R) can be used for estimating FFM in children.
    • Impedance analysis offers a promising, non-invasive method for body composition assessment in children.