早产儿婴儿期的身体组成
Body composition of preterm infants during infancy.
作者信息
Cooke R J, Rawlings D J, McCormick K, Griffin I J, Faulkner K, Wells J C, Smith J S, Robinson S J
机构信息
Regional Medical Physics Department Freeman Hospital Newcastle upon Tyne.
出版信息
Arch Dis Child Fetal Neonatal Ed. 1999 May;80(3):F188-91. doi: 10.1136/fn.80.3.f188.
AIMS
To examine body composition in preterm infants.
METHODS
Body composition was measured by dual energy x-ray absorptiometry (DEXA) at hospital discharge, term, 12 weeks, and at 6 and 12 months corrected age in 125 infants (birthweight < or = 1750 g, gestational age < or = 34 weeks).
RESULTS
Body weight derived by DEXA accurately predicted that determined by conventional scales. In both sexes lean mass (LM), fat mass (FM), %FM, bone area (BA), bone mineral mass (BMM), and bone mineral density (BMD) increased rapidly during the study; significant changes were detectable between discharge and term. At 12 months, LM, BA, and BMM, but not FM, %FM, or BMD were greater in boys than in girls. Corrected for age, LM was less than those of the reference term infant; FM and %FM were similar; BMM was greater. Corrected for weight, LM was similar to those of the reference infant, while the FM and %FM of study infants were slightly greater.
CONCLUSIONS
DEXA accurately measures body mass. Body composition in preterm boys and girls differs. Interpretation of DEXA values may depend on whether age or body weight are regarded as the appropriate reference.
目的
研究早产儿的身体成分。
方法
对125名婴儿（出生体重≤1750克，胎龄≤34周）在出院时、足月时、12周时以及矫正年龄6个月和12个月时采用双能X线吸收法（DEXA）测量身体成分。
结果
DEXA得出的体重能准确预测传统秤测量的体重。在研究期间，男女两性的瘦体重（LM）、脂肪量（FM）、脂肪百分比（%FM）、骨面积（BA）、骨矿物质含量（BMM）和骨矿物质密度（BMD）均迅速增加；出院时和足月时之间可检测到显著变化。在12个月时，男孩的LM、BA和BMM大于女孩，但FM、%FM或BMD并非如此。校正年龄后，LM低于足月参考婴儿；FM和%FM相似；BMM更高。校正体重后，LM与参考婴儿相似，而研究婴儿的FM和%FM略高。
结论
DEXA能准确测量体重。早产男婴和女婴的身体成分不同。DEXA值的解读可能取决于年龄或体重是否被视为合适的参考标准。
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