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- Title
The precision of human body composition measurements using air-displacement plethysmography and dual X-ray absorptiometry. Is there any difference between fasting and non-fasting measurements?
- Authors
Orlandi, Silvana P.; Bielemann, Renata M.; Martínez-Mesa, Jeovany; Barros, Aluísio J. D.; Gigante, Denise P.; Assunção, Maria Cecília F.
- Abstract
Objective: To evaluate precision using repeated measurements after repositioning in the fasting state and reproducibility on fasting and non-fasting conditions, in adults using air-displacement plethysmography (ADP) and dual x-ray absorptiometry (DXA). Research methods and procedures: Fifty-two volunteers, with mean age of 25 years (SD=3.1) and mean of body mass index of 22.5 kg/m² (SD=3.2), were measured two times on fasting conditions, after repositioning, in both devices (BOD POD® plethysmography and Lunar GE Prodigy densitometer). A third measurement was conducted in 27 of these subjects after a substantial meal using the same procedures. The variables analyzed were: BMC (bone mineral content), BMD (bone mineral density), FM (fat mass), FFM (fatfree mass), %AF (android fat), %GF (gynoid fat), BM (body mass) and BV (body volume). Body composition variables were compared using Lin's concordance correlation coefficients and Bland-Altman plots. Results: All variables evaluated were not significantly different between the two fasting measures in both devices. Lin's concordance correlation coefficient was close to 1.00 among all tested variables. Mean of BMC, FMDXA, %AF, %GF, BMDXA and BV, were greater on non-fasting conditions, but all differences were not significant. The greatest 95% limits of agreement between dual energy x-ray absorptiometry fasting 1 and postprandial were found for FMDXA and FFMDXA in which 95% of the individuals were around ±1 kg of the mean difference. There was no systematic bias between measurements performed on fasting or non-fasting state. Discussion: Measurements using ADP and DXA may be obtained regardless of the postprandial time.
- Subjects
REPRODUCIBLE research; LOW-fat diet; HUMAN body composition measurement; PLETHYSMOGRAPHY; DUAL-energy X-ray absorptiometry; FASTING
- Publication
International Journal of Body Composition Research, 2013, Vol 11, Issue 2, p43
- ISSN
1479-456X
- Publication type
Article