Precision and within- and between-day variation of bioimpedance parameters in children aged 2–14 years

• Published in: Clinical nutrition (Edinburgh, Scotland) Scotland), 2011-06, Vol.30 (3), p.326-331
• Main Authors: Andersen, Trine B, Jødal, Lars, Arveschoug, Anne, Eskild-Jensen, Anni, Frøkiær, Jørgen, Brøchner-Mortensen, Jens
• Format: Article
• Language: English
• Subjects: Adipose Tissue; Adipose Tissue - growth & development; Adolescent; Adolescent Development; Algorithms; bioelectrical impedance; Bioelectrical impedance spectroscopy; Biological and medical sciences; Biological variation; Body Composition; body fat; Body Fluids; Child; Child Development; Child, Preschool; children; Denmark; Dielectric Spectroscopy; Electric Impedance; Extracellular Fluid; fat free mass; Feeding. Feeding behavior; Female; Fundamental and applied biological sciences. Psychology; Gastroenterology and Hepatology; growth & development; Humans; Intracellular Fluid; lean body mass; linear models; Male; normal values; Reference Values; Repeatability; Reproducibility of Results; statistical analysis; statistical models; Statistics as Topic; Vertebrates: anatomy and physiology, studies on body, several organs or systems
• ISSN: 0261-5614; 1532-1983
• DOI: 10.1016/j.clnu.2010.10.005

Summary Background & aims Bioimpedance spectroscopy (BIS) offers the possibility to perform rapid estimates of fluid distribution and body composition. Few studies, however, have addressed the precision and biological variation in a pediatric population. Our objectives were to evaluate precision, variation within- and between-days for the BIS-determined parameters total body fluid, extra-cellular fluid, intra-cellular fluid, body cell mass, fat-free mass, extra-cellular resistance, intra-cellular resistance and percentage body fat using a Xitron 4200. Methods All 133 children (81 boys, 52 girls; 2.4–14.9 years) had one series measured on day one (precision population). Forty-four children had a second series on day one (within-day sub-population). Thirty-two children had a series measured on the next day (between-day sub-population). Each measurement series consisted of three repeated measurements. A linear mixed model was used for statistical analysis. Results The precision was 0.3–0.8% in children ≥6 years and 0.5–2.4% in children