Objective To explore the age and gender differences in body composition of children in Haidian District,Beijing,to research development rules of body composition,and to accumulate data for researching the growth of the dynamic data and development of the body composition of children in the future. Methods Children aged 6~15 were enrolled by random sampling,including 510 males and 497 females.In this study,two-factor ANOVA was used to analyze the effects of age and sex on the body composition,one-factor ANOVA was used to analyze the differences of age on body composition,independent sample t test was used to analyze the differences of gender on body composition,data fitting method was used to establish the regression equation of the change of body composition index. Results Relative total water and relative protein first flat,second decline,third flat,then increase,finally flat with increasing age in boys.Relative inorganic salt first flat,second decline,third flat,then increase,finally flat with increasing age in boys.Relative visceral fat area first flat,second increase,third flat,forth increase,then flat,finally increase with increasing age in boys.Relative total water and relative protein first flat,second decline,third flat,then decline,finally flat with increasing age in girls.Relative inorganic salt first flat,second decline,finally flat with increasing age in girls.Relative visceral fat area first flat,second increase,third flat,then increase,finally flat with increasing age in girls. Conclusions This study demonstrates that age and gender have significant effects on body composition.The body composition should be controlled during childhood according to different genders,so as to provide reference value for the prevention of children obesity.
Key words
children aged 6~15 /
body composition /
growth /
development
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