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

2003 ◽  
Vol 94 (2) ◽  
pp. 499-506 ◽  
Author(s):  
Grant E. van der Ploeg ◽  
Robert T. Withers ◽  
Joe Laforgia
Keyword(s):  
Body Fat ◽  
Compartment Model ◽  
Dual Energy ◽  
Fat Free Mass ◽  
Tissue Thickness ◽  
Beam Hardening ◽  
Altman Plot ◽  
X Ray ◽  
Bone Mineral Mass ◽  
Anterior Posterior

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 × 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.

scholarly journals Measurement of Percentage of Body Fat in 411 Children and Adolescents: A Comparison of Dual-Energy X-Ray Absorptiometry With a Four-Compartment Model

PEDIATRICS ◽  
2004 ◽  
Vol 113 (5) ◽  
pp. 1285-1290 ◽  
Author(s):  
A. B. Sopher ◽  
J. C. Thornton ◽  
J. Wang ◽  
R. N. Pierson ◽  
S. B. Heymsfield ◽  
...  
Keyword(s):  
Children And Adolescents ◽  
Body Fat ◽  
Compartment Model ◽  
Dual Energy ◽  
X Ray ◽  
Percentage Of Body Fat

scholarly journals Comparison of Dual-Energy X-Ray Absorptiometry (DXA) versus a Multi-frequency Bioelectrical Impedance (InBody 770) Device for Body Composition Assessment after a 4-Week Hypoenergetic Diet

2019 ◽  
Vol 4 (2) ◽  
pp. 23 ◽  
Author(s):  
Antonio ◽  
Kenyon ◽  
Ellerbroek ◽  
Carson ◽  
Burgess ◽  
...  
Keyword(s):  
Body Composition ◽  
Energy Intake ◽  
Body Fat ◽  
Fat Mass ◽  
Bioelectrical Impedance ◽  
Dual Energy ◽  
Fat Free Mass ◽  
Percent Body Fat ◽  
Men And Women ◽  
X Ray

The purpose of this investigation was to compare two different methods of assessing body composition (i.e., a multi-frequency bioelectrical impedance analysis (MF-BIA) and dual-energy x-ray absorptiometry (DXA)) over a four-week treatment period in exercise-trained men and women. Subjects were instructed to reduce their energy intake while maintaining the same exercise regimen for a period of four weeks. Pre and post assessments for body composition (i.e., fat-free mass, fat mass, percent body fat) were determined via the MF-BIA and DXA. On average, subjects reduced their energy intake by ~18 percent. The MF-BIA underestimated fat mass and percentage body fat and overestimated fat-free mass in comparison to the DXA. However, when assessing the change in fat mass, fat-free mass or percent body fat, there were no statistically significant differences between the MF-BIA vs. DXA. Overall, the change in percent body fat using the DXA vs. the MF-BIA was −1.3 ± 0.9 and −1.4 ± 1.8, respectively. Our data suggest that when tracking body composition over a period of four weeks, the MF-BIA may be a viable alternative to the DXA in exercise-trained men and women.

scholarly journals Identification of and Associations among Low, Middle, and High Body Composition Trajectories from Age 5- to 17-Years

Children ◽  
2020 ◽  
Vol 7 (10) ◽  
pp. 192
Author(s):  
Teresa A. Marshall ◽  
Alexandra M. Curtis ◽  
Joseph E. Cavanaugh ◽  
John J. Warren ◽  
Steven M. Levy
Keyword(s):  
Body Composition ◽  
Body Fat ◽  
Fat Mass ◽  
Dual Energy ◽  
Fat Free Mass ◽  
Clinical Settings ◽  
Fat Mass Index ◽  
X Ray ◽  
Body Composition Measure ◽  
Dxa Scans

Our objective was to identify sex-specific age 5- to 17-year body composition (body mass index (BMI), % body fat, fat mass index, fat-free mass index) trajectories, compare trajectories assigned using age 5 (AGE5) data to those assigned using all available (ALL) data, and compare BMI assignments to other body composition assignments. Cluster analysis was used to identify low, medium, and high trajectories from body composition measures obtained from dual energy x-ray absorptiometry (DXA) scans at 5, 9, 11, 13, 15, and 17 years in a birth cohort followed longitudinally (n = 469). Moderate agreement was observed for comparisons between AGE5 data and ALL data cluster assignments for each body composition measure. Agreement between cluster assignments for BMI and other body composition measures was stronger using ALL data than using AGE5 data. Our results suggest that BMI, % body fat, fat mass index, and fat free mass index trajectories are established during early childhood, and that BMI is a reasonable predictor of body composition appropriate to track obesity in public health and clinical settings.

Acute Feeding Has Minimal Effect on the Validity of Body Composition and Metabolic Measures: Dual Energy X-ray Absorptiometry and a Multi-compartment Model

2021 ◽  
pp. 1-39
Author(s):  
Abbie E. Smith-Ryan ◽  
Gabrielle J. Brewer ◽  
Lacey M. Gould ◽  
Malia N.M. Blue ◽  
Katie R. Hirsch ◽  
...  
Keyword(s):  
Body Composition ◽  
Measurement Error ◽  
Fat Mass ◽  
Total Error ◽  
Resting Metabolic Rate ◽  
Compartment Model ◽  
Total Sample ◽  
Dual Energy ◽  
Fat Free Mass ◽  
X Ray

Abstract Understanding the effects of acute feeding on body composition and metabolic measures is essential to the translational component and practical application of measurement and clinical use. To investigate the influence of acute feeding on the validity of dual energy x-ray absorptiometry (DXA), a four-compartment model (4C), and indirect calorimetry metabolic outcomes, 39 healthy young adults (n=19 females; age: 21.8± 3.1 yrs, weight; 71.5 ± 10.0 kg) participated in a randomized cross-over study. Subjects were provided one of four randomized meals on separate occasions (high carbohydrate, high protein, ad libitum or fasted baseline) prior to body composition and metabolic assessments. Regardless of macronutrient content, acute feeding increased DXA percent body fat (%fat) for the total sample and females [average constant error (CE):-0.30%; total error (TE): 2.34%), although not significant (p=0.062); the error in males was minimal (CE: 0.11%; TE: 0.86%). DXA fat mass (CE: 0.26 kg; TE: 0.75 kg), lean mass (CE: 0.83 kg; TE: 1.23 kg) were not altered beyond measurement error for the total sample. 4C %fat was significantly impacted from all acute feedings (avg CE: 0.46%; TE: 3.7%). 4C fat mass (CE: 0.71 kg; TE: 3.38 kg) and fat-free mass (CE: 0.55 kg; TE: 3.05 kg) exceeded measurement error for the total sample. Resting metabolic rate was increased for each feeding condition (TE: 398.4 kcal/d). Standard pre-testing fasting guidelines may be important when evaluating DXA and 4C %fat, whereas additional DXA variables (FM, LM) may not be significantly impacted by an acute meal. Measuring body composition via DXA under less stringent pre-testing guidelines may be valid and increase feasibility of testing in clinical settings.

Fat-Free Mass and Percent Body Fat Assessments by Dual-Energy X-ray Absorptiometry, Densitometry and Total Body Water

1993 ◽  
pp. 71-74
Author(s):  
Rita Wellens ◽  
Alex F. Roche ◽  
Shumei Guo ◽  
William C. Chumlea ◽  
Roger M. Siervogel
Keyword(s):  
Body Fat ◽  
Total Body Water ◽  
Dual Energy ◽  
Body Water ◽  
Fat Free Mass ◽  
Percent Body Fat ◽  
X Ray ◽  
Total Body

Physical Activity, Media Time, and Body Composition in Young Children

2006 ◽  
Vol 3 (2) ◽  
pp. 200-209 ◽  
Author(s):  
Kate A. Heelan ◽  
Joey C. Eisenmann
Keyword(s):  
Physical Activity ◽  
Body Mass Index ◽  
Body Composition ◽  
Young Children ◽  
Body Fat ◽  
Dual Energy ◽  
The Body ◽  
Fat Free Mass ◽  
Computer Usage ◽  
X Ray

Background:It is uncertain as to whether physical activity (PA) may influence the body composition of young children.Purpose:To determine the association between PA, media time, and body composition in children age 4 to 7 y.Methods:100 children (52 girls, 48 boys) were assessed for body-mass index (BMI), body fat, fat mass (FM), and fat-free mass using dual energy x-ray absorbtiometryptiometry (DXA). PA was monitored using accelerometers and media time was reported by parental proxy.Results:In general, correlations were low to moderate at best (r < 0.51), but in the expected direction. Total media time and TV were significantly associated with BMI (r = 0.51, P < 0.05) and FM (r = 0.29 to 0.30, P < 0.05) in girls. In boys, computer usage was significantly associated with FM in boys (r = 0.31, P < 0.05).Conclusion:The relatively low correlations suggest that other factors may influence the complex, multi-factorial body composition phenotype of young children.

scholarly journals Body fat and fat-free mass measured by bioelectric impedance spectroscopy and dual-energy X-ray absorptiometry in obese and non-obese adults

2011 ◽  
Vol 107 (8) ◽  
pp. 1192-1200 ◽  
Author(s):  
Paula Berstad ◽  
Anna Randby ◽  
Gunn Seim Ekeland ◽  
Hege Ulveland ◽  
Torbjørn Omland ◽  
...  
Keyword(s):  
Impedance Spectroscopy ◽  
Body Fat ◽  
Individual Variation ◽  
Dual Energy ◽  
Normal Weight ◽  
Mean Difference ◽  
Fat Free Mass ◽  
Single Individual ◽  
X Ray ◽  
Bioelectric Impedance

The aim of the present study was to compare body fat mass (FM) and fat-free mass (FFM) estimates by bioelectric impedance spectroscopy (BIS), with respective estimates by dual-energy X-ray absorptiometry (DXA), in obese and non-obese subjects. Body composition was measured in ninety-three obese and non-obese men and women by BIS device, BodyScout (Fresenius Kabi, Bad Homburg, Germany) and DXA device, Lunar iDXA (GE Healthcare, Madison, WI, USA). Mean difference between the methods was analysed by t tests, and Bland–Altman plots were generated to further examine the differences between the methods. Mean difference between the estimates by DXA and BIS (ΔDXA − BIS and Bland–Altman 95 % limits of agreement) were as follows: FM 4·1 ( − 2·9, 11·2) kg and 4·5 ( − 2·9, 11·8) %, FFM − 4·1 ( − 11·2, 2·9) kg and − 4·5 ( − 11·9, 2·9) %, indicating large inter-individual variation and statistically significant underestimation of FM and overestimation of FFM by BIS, as compared to DXA. The underestimation of FMkg (FM measured in kg) and overestimation of FFMkg (FFM measured in kg) were more pronounced in men than in women, and the underestimation of FM% (FM measured in percent) and overestimation of FFM% (FFM measured in percent) were more pronounced in normal weight (BMI = 20·0–24·9 kg/m2) than in overweight and obese (BMI ≥ 25·0 kg/m2) subjects. BIS may be suitable for classification of a population into groups according to FM and FFM. However, the large inter-individual variation suggests that this BIS device with the proprietary software is insufficient for estimation of single individual body FM and FFM.

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