Percent body fat via DEXA: comparison with a four-compartment model | Zendy

Grant E. van der Ploeg | Zendy; R. T. Withers | Zendy; J. Laforgia | Zendy

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Percent body fat via DEXA: comparison with a four-compartment model

Author(s) -

Grant E. van der Ploeg,

R. T. Withers,

J. Laforgia

Publication year - 2003

Publication title -

journal of applied physiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.253

H-Index - 229

eISSN - 8750-7587

pISSN - 1522-1601

DOI - 10.1152/japplphysiol.00436.2002

Subject(s) - dual energy x ray absorptiometry , zoology , fat mass , linear regression , fat free mass , body fat percentage , dual energy , bone mineral , chemistry , medicine , body weight , nuclear medicine , endocrinology , body mass index , mathematics , biology , osteoporosis , statistics

This study compared body composition by dual-energy X-ray absorptiometry (DEXA; Lunar DPX-L) with that via a four-compartment (4C; water, bone mineral mass, fat, and residual) model. Relative body fat was determined for 152 healthy adults [30.0 +/- 11.1 (SD) yr; 75.10 +/- 14.88 kg; 176.3 +/- 8.7 cm] aged from 18 to 59 yr. The 4C approach [20.7% body fat (%BF)] resulted in a significantly (P < 0.001) higher mean %BF compared with DEXA (18.9% BF), with intraindividual variations ranging from -2.6 to 7.3% BF. Linear regression and a Bland and Altman plot demonstrated the tendency for DEXA to progressively underestimate the %BF of leaner individuals compared with the criterion 4C model (4C %BF = 0.862 x DEXA %BF + 4.417; r(2) = 0.952, standard error of estimate = 1.6% BF). This bias was not attributable to variations in fat-free mass hydration but may have been due to beam-hardening errors that resulted from differences in anterior-posterior tissue thickness.

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