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ARS Home » Plains Area » Houston, Texas » Children's Nutrition Research Center » Research » Publications at this Location » Publication #66604
Title: COMPARISON OF 2-, 3- AND 4-COMPARTMENT MODELS FOR ESTIMATION OF BODY FAT INPREGNANCY

Author
item HOPKINSON, JUDY - BAYLOR COLL OF MEDICINE
item ELLIS, KENNETH - BAYLOR COLL OF MEDICINE
item WONG, WILLIAM - BAYLOR COLL OF MEDICINE
item PUYAU, MAURICE - BAYLOR COLL OF MEDICINE
item BUTTE, NANCY - BAYLOR COLL OF MEDICINE

Submitted to: Experimental Biology
Publication Type: Abstract Only
Publication Acceptance Date: 4/1/1996
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Body composition models for pregnancy were evaluated against a 4-compartment model (4-C) which bypasses assumptions regarding fat free mass (FFM). Total body water (TBW by deuterium dilution), total body potassium (TBK by 40K counting), body density and volume (BD and BV by hydrodensitometry), were measured at 36.4+/-1 wk gestation in 52 women. Bone mineral content (BMC) was measured 2 wk postpartum by DEXA. Model: FM(kg)+/-SD bias+/-2SD 2-C:FM=WT -TBW / 0.73 20.49+/-7.46 -2.14+/-2.69 FM=WT -TBW / 0.7475 (van Raaij) 21.76+/-7.49 -0.86+/-2.60 FM=WT ((4.95/BD)-4.5) 25.49+/-7.19 +2.87+/-2.88 FM=WT ((5.19/BD)-4.76) (van Raaij) 23.14+/-7.10 +0.52+/-2.97 FM=WT-TBK/60 27.79+/-8.0 +5.17+/-5.64 3-C:FM=WT((2.118/BD)-0.78(TBW/WT)-1.354) 22.75+/-7.19 +0.13+/-0.56 4-C:FM=2.747BV-0.71TBW+1.46BMC-2.05WT 22.62+/-7.19 Pregnancy-specific constants for hydration or density (e.g. van Raaij models) reduce systematic differences between 4-C and 2-C standard models, but wide limits of agreement limit the usefulness of 2-C models. BMC did not contribute significantly to estimates of FM. The 3-C and 4-C models are appropriate for use in pregnancy.