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FAT AND FAT FREE MASS IN NORMAL, DANISH CHILDREN AGED 6 TO 16 YEARS. A BIOELECTRICAL IMPEDANCE STUDY

Interest in the estimation of body fat mass (BF) and fat free mass (FFM) has increased in recent years due to its relationship to endocrine function, in particular growth hormone (GH) status and its change after exogenous GH therapy. Bioelectrical impedance is a reliable and non-invasive method for the assessment of body composition, in which the amount of fat and fat free mass is calculated by measuring the resistance of the body to an electric current. The aim of the present study was to determine the changes in body composition during childhood and puberty in normal Danish schoolchildren using the bioelectrical impedance method. We examined bioelectrical impedance (Holtain BCA, UK), height, weight and pubertal stage (Tanner) in 388 children, aged 6 to 16 years.In girls, we found a significant increase in body fat percent (BF%) with age and pubertal maturation (p<0.01). In boys, there was no significant change with age or pubertal maturation, although there seemed to be a fall in BF% at the end of wed reciprocal values. The differences according to sex and age found in this study are consistent with previous studies on BF using conventional methods and can be used as reference material in the study of children with disorders of growth and puberty.