Cited by 186Body Composition Measurement TechniquesBone health and osteoporosis researchHIV-related health complications and treatments

Preliminary evidence that DEXA provides an accurate assessment of body composition

Kohrt, Wendy M.·1998·Journal of Applied Physiology

Abstract

Kohrt, Wendy M. Preliminary evidence that DEXA provides an accurate assessment of body composition. J. Appl. Physiol. 84(1): 372–377, 1998.—It was previously found that dual-energy X-ray absorptiometry (DEXA) underestimated central body fat. The purposes of this study were to determine whether an updated version (enhanced version 5.64) of the analysis program corrected this problem ( experiment 1) and to compare body composition assessed by DEXA and hydrodensitometry (HD) in women ( n= 225) and men ( n = 110) across a 21- to 81-yr age range ( experiment 2). For experiment 1, 10 subjects underwent DEXA procedures in a control condition and with packets of lard positioned over either the thighs or the truncal region. DEXA accurately quantified the additional mass as ∼96% fat, regardless of position. For experiment 2, DEXA yielded higher ( P < 0.001) estimates of fatness than did HD (32.1 ± 12.0 vs. 31.2 ± 10.1%). The mean difference between the two methods was similar in young, middle-aged, and older subjects, but was different in men (HD − DEXA, 1.6 ± 3.4% of body wt) than in women (−2.1 ± 3.8% of body wt). Correcting the density of fat-free mass for variance in the bone mineral fraction of fat-free mass reduced the difference between the methods in men from 1.6 ± 3.4 to −0.7 ± 2.9% but widened it in women from −2.1 ± 3.8 to −3.5 ± 3.4%. A second correction procedure that adjusted for variance in water, protein, and mineral fractions of fat-free mass eliminated the differences in estimates of fat content by DEXA and HD in both men (21.1 ± 9.3 vs. 20.6 ± 8.4%, respectively) and women (37.5 ± 9.3 vs. 36.8 ± 8.0%, respectively). These results provide encouraging, but not definitive, evidence that the assessment of body composition by DEXA is accurate under the specified conditions.

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Crossref · 10.1152/jappl.1998.84.1.372

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  • DXA estimates of %BF are accurate, but values can differ by DXA instrumentation.

    “Estimates of %BF are also accurate (11)(12)(13), but values can differ based on the DXA instrumentation utilized (e.g., Lunar, Hologic, Norland).”

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Authors
Kohrt, W. M.
Affiliations
Washington University in St. Louis (US)
Corresponding author
Kohrt, Wendy M.
Venue
Journal of Applied Physiology
Published
1998-01-01
Volume
84
Issue
1
Pages
372-377
ISSN
  • 0161-7567 (ISSN-L)
  • 8750-7587
  • 1522-1601
OpenAlex
W2211648765
Cited by
186
References
19
Citations by year
2026: 3 · 2025: 2 · 2024: 2 · 2023: 4 · 2022: 1 · 2021: 3 · 2020: 1 · 2019: 4 · 2018: 8 · 2017: 6 · 2016: 6 · 2015: 6 · 2014: 9 · 2013: 5 · 2012: 8
FWCI
5.74
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Applied Physiology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (5r29ar040705-05)
  • National Institute on Aging (P60AG013629, AG-13629, AG05562)
  • National Institute of Arthritis and Musculoskeletal and Skin Diseases (AR-40705)
Topics
  • Health Sciences › Medicine › Physiology › Body Composition Measurement Techniques
  • Health Sciences › Medicine › Orthopedics and Sports Medicine › Bone health and osteoporosis research
  • Health Sciences › Medicine › Emergency Medicine › HIV-related health complications and treatments
Keywords
dual-energy X-ray absorptiometry, body composition, hydrodensitometry, method comparison, sex differences, age differences, fat determination
MeSH terms
Adipose Tissue, Adolescent, Adult, Aging, Body Composition, Body Water, Densitometry, Diagnostic Imaging, Female, Humans, Male, Middle Aged, Proteins, Reference Values, Sex Characteristics, Absorptiometry, Photon, Bone Density

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