关键词: 体成分, 瘦体重与脂肪质量比值, 体脂百分比, 复合型肥胖, 学龄儿童

Abstract: Objective To analyze the differences in body composition among school-age children with different genders, weight status or obesity types, and to explore the influence of weight status or obesity types on muscle to fat ratio (MFR) and fat mass percentage (FMP). Methods A total of 440 seven-year-old children from Laizhou Wan Birth Cohort were followed up from 2019 to 2020.Twelve kinds of body composition indexes related to the total body composition, fat free mass and fat mass were measured and calculated by human component analyzer.Weight status was divided into three types based on body mass index (BMI).BMI and waist-to-height ratio were used to divide the participants into four obesity types.Then the correlations of weight status and obesity type with body composition were analyzed. Results No significant gender difference in MFR and FMP was found (t=1.16, 0.39, P>0.05).MFR showed a decreased trend among the normal, overweight and obesity groups, and it also decreased in non-obesity, abdominal obesity, general obesity and compound obesity (F=141.65, 63.96, P<0.05).But other body composition indexes increased gradually among groups (P<0.05).The results of multiple linear regression showed that MFR was 3.28 (95%CI:-3.69 - -2.87,P<0.001) lower and FMP was 17.25% (95%CI:16.07 - 18.43,P<0.001) higher in the obese group than that in the normal group.MFR was 3.18 (95%CI:-3.65 - -2.71, P<0.001) lower and FMP was 17.55% (95%CI:16.15 - 18.95, P<0.001) higher in the compound obesity group than that in the non-obesity group. Conclusions The weight gain of obese children is mainly attributed to the increase of body fat.The imbalance of muscle and fat in children with compound obesity suggests that the prevention and control of compound obesity in childhood has important public health significance to reduce its health risk.

Key words: body composition, muscle to fat ratio, fat mass percentage, compound obesity, school-age children