ИСТИНА

Studying of body mass composition is one of the most interesting problems of modern auxology. The aim of the present study is to find out sex differences in fat (FM), muscular (MM) and lean (LM) body mass growth curves in Russian boys (684) and girls (769) of 7-17 years old from the city of Arkhangelsk, Russia. Body mass components were evaluated by BIA (a tetra polar multi frequency system ABC-01 Medass). Also we analyzed total body parameters and percentages of body mass components in body mass. The results show that the growth curves of height and weight have a typical shape. Boys are taller, the differences are significant starting from 14 years. Girls are heavier, the differences are significant starting from 15 years. BMI during this age interval does not show significant sex differences. Girls have significantly higher FM, starting from 12 years. Boys have significantly higher LM and MM, LM starting from 14 years, MM - at almost all ages. In girls %FM increases during this age interval, while %LM decreases, %MM increases till 12 years, then decreases. In boys %MM increases during the studied age interval, while %FM increases and %LM decreases till 11 years, then they change direction.