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目的比较儿童双能X线吸收法与生物电阻抗法身体成分结果,为儿童体成分研究提供方法学基础。方法选择7~15岁体重正常儿童180名,每性别、年龄组约10名,分别采用DEXA和BIA测定身体脂肪组织和非脂肪组织成分及骨矿含量,分析2种方法测量结果的相关性和一致性。结果7~15岁儿童肌肉组织、骨矿含量、脂肪组织和脂肪百分比BIA与DEXA测量结果的相关系数,除个别年龄段的个别指标外,均有统计学意义(P值均<0.05);各年龄组女生脂肪组织和脂肪百分比测量值相关系数均高于男生。BIA与DEXA脂肪百分比测量结果的平均差值随年龄增长而降低,但男生差值标准差随年龄增长而增加,女生相对稳定。Bland-Altman图分析男生BIA与DEXA脂肪百分比结果的一致性限男生为-7.6%~12.6%,女生为-3.2%~10.4%。男、女生BIA得出的非脂肪组织指数(FFMI)大于DEXA结果,差值在2.0以内,男生有随脂肪百分比含量升高而增加的趋势;女生20%~30%脂肪百分比组差值最小。结论儿童BIA与DEXA身体成分测量值相关性好。BIA与DEXA相比,可低估脂肪组织含量和脂肪百分比,高估肌肉组织含量和骨矿含量。
Objective To compare the results of body composition of children with dual-energy X-ray absorption and bioelectrical impedance spectroscopy, and to provide a methodological basis for the study of body composition of children. Methods 180 normal children aged 7-15 years old were selected, with about 10 in each sex and age group. The contents of body fat and non-fat tissue and bone mineral content were measured by DEXA and BIA respectively. The correlation between the results of two methods and consistency. Results The correlation coefficients of BIA and DEXA in muscle, bone mineral content, adipose tissue and percentage of fat in 7-15-year-old children were all statistically significant (P <0.05) except for individual indexes of individual age groups. The correlation coefficients of adipose tissue and percentage of fat in girls of the age group were higher than boys. The average difference between BIA and DEXA fat percentage measurement decreases with age, but the standard deviation of male differences increases with age, while girls are relatively stable. Bland-Altman graph analysis of male BIA and DEXA fat percentage consistency of the results for male students was -7.6% ~ 12.6%, girls was -3.2% ~ 10.4%. The FFIA of boys and girls BIA was higher than that of DEXA, the difference was within 2.0, boys tended to increase with the increase of percentage of fat, and the difference of 20% -30% of fat was the lowest among girls. Conclusion Children BIA and DEXA good correlation between body composition measurements. Compared with DEXA, BIA underestimates adipose tissue content and fat percentage, overestimates muscle tissue content and bone mineral content.