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Nutrients 2016, 8(7), 417; doi:10.3390/nu8070417

Length Normalized Indices for Fat Mass and Fat-Free Mass in Preterm and Term Infants during the First Six Months of Life

1
Division of Neonatology, Department of Pediatrics, University of Calgary, 780C, Foothills Medical Centre, 1403, 29th Street NW, Calgary, AB T2N 2T9, Canada
2
Division of Neonatology, Department of Pediatrics, McMaster University, 1280 Main Street West, Room HSC-4F5, Hamilton, ON L8S 4K1, Canada
3
Department of Mathematics and Statistics, McMaster University, 1280 Main Street West, Hamilton, ON L8S 4K1, Canada
4
Department of Pediatrics, University of Greifswald, Ferdinand-Sauerbruch-Straße, Greifswald 17475, Germany
5
Department of Pediatrics, Division of Neonatology, Inselspital and University of Berne, Effingerstraße 102, Berne 3010, Switzerland
6
Department of Pediatrics, Paracelsus Medical University Nuremberg, Nuremberg General Hospital, Prof.-Ernst-Nathan-Str. 1, Nuremberg 90219, Germany
*
Author to whom correspondence should be addressed.
Received: 11 April 2016 / Revised: 18 June 2016 / Accepted: 28 June 2016 / Published: 8 July 2016
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Abstract

Objective: Postnatal tissue accretion in preterm infants differs from those in utero, affecting body composition (BC) and lifelong morbidity. Length normalized BC data allows infants with different body lengths to be compared and followed longitudinally. This study aims to analyze BC of preterm and term infants during the first six months of life. Methods: The BC data, measured using dual energy X-ray absorptiometry, of 389 preterm and 132 term infants from four longitudinal studies were combined. Fat-mass/length2 (FMI) and fat-free mass/length2 (FFMI) for postmenstrual age were calculated after reaching full enteral feeding, at term and two further time points up to six months corrected age. Results: Median FMI (preterm) increased from 0.4 kg/m2 at 30 weeks to 2.5, 4.3, and 4.8 kg/m2 compared to 1.7, 4.7, and 6 kg/m2 in term infants at 40, 52, and 64 weeks, respectively. Median FFMI (preterm) increased from 8.5 kg/m2 (30 weeks) to 11.4 kg/m2 (45 weeks) and remained constant thereafter, whereas term FFMI remained constant at 11 kg/m2 throughout the tested time points. Conclusion: The study provides a large dataset of length normalized BC indices. Followed longitudinally, term and preterm infants differ considerably during early infancy in the pattern of change in FMI and FFMI for age. View Full-Text
Keywords: fat mass index; fat free mass index; body composition; fat mass; lean mass; growth; nutrition; postnatal fat mass index; fat free mass index; body composition; fat mass; lean mass; growth; nutrition; postnatal
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Goswami, I.; Rochow, N.; Fusch, G.; Liu, K.; Marrin, M.L.; Heckmann, M.; Nelle, M.; Fusch, C. Length Normalized Indices for Fat Mass and Fat-Free Mass in Preterm and Term Infants during the First Six Months of Life. Nutrients 2016, 8, 417.

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