Bioelectrical impedance vector reference values for assessing body composition in a Spanish child and adolescent population

Bioelectrical impedance vector reference values for assessing body composition in a Spanish child and adolescent population

Objectives Reference values of the bioelectrical impedance vector for the Spanish child and adolescent population are needed for assessing body composition and hydration status in this population. The aim of this study is to provide reference values of the bioelectrical impedance vector in Spanish c...

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Bibliographic Details
Published in:American journal of human biology Vol. 29; no. 4
Main Authors: Redondo‐del‐Río, María Paz, Camina‐Martín, María Alicia, Marugán‐de‐Miguelsanz, Josí‐Manuel, de‐Mateo‐Silleras, Beatriz
Format: Journal Article
Language:English
Published: United States Wiley Subscription Services, Inc 01-07-2017
Subjects:
Adolescent
Adolescents
Age
bioelectric impedance
Bioelectricity
BIVA
Bivariate analysis
Body Composition
Child
Child, Preschool
childhood
Children
Children & youth
Cross-Sectional Studies
Electric Impedance
Ellipses
Female
Frequency analysis
Girls
Humans
Hydration
Impedance
Male
nutritional assessment
Population
Population studies
Reactance
Reference Values
Sex
Sex differences
Spain
Teenagers
Vector analysis
bioelectric impedance
body composition
nutritional assessment
childhood
BIVA
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Summary:Objectives Reference values of the bioelectrical impedance vector for the Spanish child and adolescent population are needed for assessing body composition and hydration status in this population. The aim of this study is to provide reference values of the bioelectrical impedance vector in Spanish children and adolescents aged 4‐18 years from Castilla y León. Methods This was a cross‐sectional descriptive study conducted in 4401 Spanish healthy children and adolescents aged 4‐18 years (2265 boys and 2136 girls). Resistance and reactance were measured with a single‐frequency impedance analyzer at 50 kHz (tetrapolar analysis). The values of resistance and reactance normalized by height were used to plot the bivariate 50th, 75th, and 95th percentiles of the population by age group. Mean impedance vectors were compared with Hotelling's T2 test for vector analysis (differences being considered significant if p < .05). Results Tolerance ellipses were drawn for the Spanish child and adolescent population studied. The mean impedance vector showed displacement across all age groups except for (1) girls aged 12–13 years, (2) girls aged 15–18 years, and (3) boys aged 16–18 years. There were sex‐related differences in the mean impedance vector in all age ranges, even in prepubertal children. Among adolescents, the patterns of the vector displacement were consistent with the timing of normal growth and development in all groups and are attributable to the maturation process. Conclusions New tolerance ellipses have been constructed for Spanish children and adolescents by sex and age. These ellipses reflect the timing of normal childhood growth and development.
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ISSN:1042-0533
1520-6300
DOI:10.1002/ajhb.22978