Abstract
Background: Advances in dual-energy X-ray absorptiometry (DXA) software algorithms have improved the accuracy of this method for body-composition measurement. Objective: Our objective was to compare the utility of DXA, underwater weighing (UWW), and a multicomponent model (MC) for assessing changes in body composition. Design: Previously sedentary women aged 40-66 y were randomly assigned to exercise training (ET; n = 36) and no exercise training (NT; n = 40). ET subjects exercised 3 d/wk; NT subjects remained sedentary. Changes in body mass, fat mass, and fat-free mass over 1 y were assessed by the 3 methods. Results: Correlations among methods were significant and large (0.73-0.97). Body weight did not change significantly in either group. In the ET group, fat-free mass increased significantly as assessed by DXA (0.7 ± 1.0 kg) but changes assessed by MC and UWW were not significant. Changes in fat mass and percentage body fat in the ET group were not significant. SDs for changes in fat mass and percentage body fat, respectively, from DXA were 2.5 kg and 2.7%; for MC, 5.5 kg and 7.1%; and for UWW, 4.4 kg and 5.8%. In the NT group, changes in fat-free mass, fat mass, and percentage body fat were significant (P ≤ 0.02) as assessed by MC (fat-free mass, - 1.5 ± 3.7 kg; fat mass, 2.3 ± 4.1 kg; percentage body fat, 2.8 ± 4.7%) and UWW (fat-free mass, -1.1 ± 2.5 kg; fat mass, 2.1 ± 3.6 kg; percentage body fat, 2.5 ± 3.5%), but changes by DXA were not significant (fat-free mass, 0.2 ± 1.2 kg; fat mass, 1.0 ± 3.9 kg; percentage body fat, 0.6 ± 3.2%). Conclusion: DXA was the most sensitive method for assessing small changes in body composition of postmenopausal women.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 401-406 |
| Number of pages | 6 |
| Journal | American Journal of Clinical Nutrition |
| Volume | 72 |
| Issue number | 2 |
| State | Published - 2000 |
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Keywords
- Body composition
- Body-composition change
- Dual-energy X-ray absorptiometry
- DXA
- Exercise
- Multicomponent models
- Postmenopausal women
- Underwater weighing
ASJC Scopus subject areas
- Medicine (miscellaneous)
- Food Science
Cite this
Comparison of methods for assessing body-composition changes over 1 y in postmenopausal women. / Houtkooper, Linda K; Going, Scott B; Sproul, Julie; Blew, Robert M.; Lohman, Timothy G.
In: American Journal of Clinical Nutrition, Vol. 72, No. 2, 2000, p. 401-406.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Comparison of methods for assessing body-composition changes over 1 y in postmenopausal women
AU - Houtkooper, Linda K
AU - Going, Scott B
AU - Sproul, Julie
AU - Blew, Robert M.
AU - Lohman, Timothy G
PY - 2000
Y1 - 2000
N2 - Background: Advances in dual-energy X-ray absorptiometry (DXA) software algorithms have improved the accuracy of this method for body-composition measurement. Objective: Our objective was to compare the utility of DXA, underwater weighing (UWW), and a multicomponent model (MC) for assessing changes in body composition. Design: Previously sedentary women aged 40-66 y were randomly assigned to exercise training (ET; n = 36) and no exercise training (NT; n = 40). ET subjects exercised 3 d/wk; NT subjects remained sedentary. Changes in body mass, fat mass, and fat-free mass over 1 y were assessed by the 3 methods. Results: Correlations among methods were significant and large (0.73-0.97). Body weight did not change significantly in either group. In the ET group, fat-free mass increased significantly as assessed by DXA (0.7 ± 1.0 kg) but changes assessed by MC and UWW were not significant. Changes in fat mass and percentage body fat in the ET group were not significant. SDs for changes in fat mass and percentage body fat, respectively, from DXA were 2.5 kg and 2.7%; for MC, 5.5 kg and 7.1%; and for UWW, 4.4 kg and 5.8%. In the NT group, changes in fat-free mass, fat mass, and percentage body fat were significant (P ≤ 0.02) as assessed by MC (fat-free mass, - 1.5 ± 3.7 kg; fat mass, 2.3 ± 4.1 kg; percentage body fat, 2.8 ± 4.7%) and UWW (fat-free mass, -1.1 ± 2.5 kg; fat mass, 2.1 ± 3.6 kg; percentage body fat, 2.5 ± 3.5%), but changes by DXA were not significant (fat-free mass, 0.2 ± 1.2 kg; fat mass, 1.0 ± 3.9 kg; percentage body fat, 0.6 ± 3.2%). Conclusion: DXA was the most sensitive method for assessing small changes in body composition of postmenopausal women.
AB - Background: Advances in dual-energy X-ray absorptiometry (DXA) software algorithms have improved the accuracy of this method for body-composition measurement. Objective: Our objective was to compare the utility of DXA, underwater weighing (UWW), and a multicomponent model (MC) for assessing changes in body composition. Design: Previously sedentary women aged 40-66 y were randomly assigned to exercise training (ET; n = 36) and no exercise training (NT; n = 40). ET subjects exercised 3 d/wk; NT subjects remained sedentary. Changes in body mass, fat mass, and fat-free mass over 1 y were assessed by the 3 methods. Results: Correlations among methods were significant and large (0.73-0.97). Body weight did not change significantly in either group. In the ET group, fat-free mass increased significantly as assessed by DXA (0.7 ± 1.0 kg) but changes assessed by MC and UWW were not significant. Changes in fat mass and percentage body fat in the ET group were not significant. SDs for changes in fat mass and percentage body fat, respectively, from DXA were 2.5 kg and 2.7%; for MC, 5.5 kg and 7.1%; and for UWW, 4.4 kg and 5.8%. In the NT group, changes in fat-free mass, fat mass, and percentage body fat were significant (P ≤ 0.02) as assessed by MC (fat-free mass, - 1.5 ± 3.7 kg; fat mass, 2.3 ± 4.1 kg; percentage body fat, 2.8 ± 4.7%) and UWW (fat-free mass, -1.1 ± 2.5 kg; fat mass, 2.1 ± 3.6 kg; percentage body fat, 2.5 ± 3.5%), but changes by DXA were not significant (fat-free mass, 0.2 ± 1.2 kg; fat mass, 1.0 ± 3.9 kg; percentage body fat, 0.6 ± 3.2%). Conclusion: DXA was the most sensitive method for assessing small changes in body composition of postmenopausal women.
KW - Body composition
KW - Body-composition change
KW - Dual-energy X-ray absorptiometry
KW - DXA
KW - Exercise
KW - Multicomponent models
KW - Postmenopausal women
KW - Underwater weighing
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UR - http://www.scopus.com/inward/citedby.url?scp=0033855295&partnerID=8YFLogxK
M3 - Article
C2 - 10919934
AN - SCOPUS:0033855295
VL - 72
SP - 401
EP - 406
JO - American Journal of Clinical Nutrition
JF - American Journal of Clinical Nutrition
SN - 0002-9165
IS - 2
ER -