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Characteristics of body composition and the relativity between fat mass and lean mass with bone mineral densityof low weight and obese children aged from 5 to 7 years old

??Objective To analyze characteristics of body composition and the relativity on percentage of body fat??PBF????fat mass??FM????lean mass??LM?? with the local and systemic bone mineral density??BMD?? of low weight and obese children aged from 5 to 7 years old. Methods A total of 311 children aged from 5 to 7 years old were divided into three groups according to gender and body mass index??BMI????the low weight group??the control group and the obesity group??who came to Department of Child Healthcare of Shengyang Children’s Hospital for roution physical examination from February 2010 to February 2012 were selected as the subjects of the study. The body composition were measured by dual energy X-ray absorptiometry??DEXA??. Data had been compared between groups and correlation had been analysised among PBF??FM??LM and BMD. Results In obesity group?? the LM??upper limbs??lower limbs and systemic BMD in boys were significantly higher than those in girls??P??0.05??. In control group??girls’s PBF??FM were significantly higher than boys’. LM?? upper limbs?? lower limbs and systemic BMD in girls were lower than those in boys??P??0.05??. In low weight group??when FM was controlled??there was positive correlation between LM and BMD??P??0.01??. When LM was controlled??there was positive correlation among PBF??LM and lower limbs BMD in obesity girls??P??0.05??. When FM was controlled??there was significantly positive correlation between LM and lower limbs BMD??P??0.01??. When FM was controlled??there was positive correlation between LM and lower limbs BMD in obesity boys??P??0.05????When LM was controlled??there was positive correlation among PBF??FM and truncal BMD??P??0.05??. Conclusion The proportion is different from controls in low weight and obese children?? and the contribution to BMD is different. It should not only pay attetion to the change of body weight??but also pay attetion to the changes of PBF??FM??LM in body composition??so as to promote the healthy development of the bone.