期刊
AMERICAN JOURNAL OF CLINICAL NUTRITION
卷 106, 期 2, 页码 559-567出版社
AMER SOC NUTRITION-ASN
DOI: 10.3945/ajcn.116.149617
关键词
neonatal adiposity; fat mass; fat-free mass; lean mass; body composition; air-displacement plethysmography
资金
- NIH [R01DK076648, R01GM121081, UL1TR001082]
- University of North Carolina Nutrition Obesity Research Center [P30DK56350]
Background: Despite widespread use of weight-and length-based anthropometric indexes as proxies for adiposity, little is known regarding the extent to which they correspond with fat mass (FM) or fat-free mass (FFM) during infancy. Objective: This study aimed to examine associations of 3 derived indicators-weight-for-age z score (WFAZ), weight-for-length score (WFLZ), and body mass index z score (BMIZ)-with FM, percentage of FM, and FFM measured by air-displacement plethysmography during the first 5 mo of life. Design: Applying prospectively collected data from 1027 infants in a Colorado prebirth cohort, we used multivariate regression to evaluate associations between the derived indicators and body composition at birth and at 5 mo, and with change (D) during follow-up. Results: At birth, all 3 derived indicators were more strongly associated with FFM than with FM. Each unit of WFAZ corresponded with 0.342 kg FFM (95% CI: 0.331, 0.351 kg FFM), compared with 0.121 kg FM (95% CI: 0.114, 0.128 kg FM)(P < 0.0001); similar trends were observed for WFLZ and BMIZ. By 5 mo, FLZ and BMIZ were more strongly associated with FM than with FFM, whereas WFAZ correlated similarly with the 2 components of body composition. Delta WFLZ and Delta BMIZ were both more strongly related to Delta FM than to Delta FFM; however, a direct comparison of the 2 indexes with respect to change in the percentage of FM indicated that Delta BMIZ was the optimal proxy of adiposity gain (P < 0.0001, pairwise difference). Conclusions: Weight-and length-based indexes are poor surrogates for newborn adiposity. However, at 5 mo, WFLZ and BMIZ are suitable proxies of FM. When assessing adiposity gain, DBMIZ is the best indicator of fat accrual during the first 5 postnatal months. This trial was registered at clinicaltrials. gov as NCT02273297.
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