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Validation of multi‐frequency bioelectrical impedance analysis versus dual‐energy X‐ray absorptiometry to measure body fat percentage in overweight/obese Colombian adults
Author(s) -
RamírezVélez Robinson,
TordecillaSanders Alejandra,
CorreaBautista Jorge Enrique,
GonzálezRuíz Katherine,
GonzálezJiménez Emilio,
TrianaReina Hector Reynaldo,
GarcíaHermoso Antonio,
SchmidtRioValle Jacqueline
Publication year - 2017
Publication title -
american journal of human biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.559
H-Index - 81
eISSN - 1520-6300
pISSN - 1042-0533
DOI - 10.1002/ajhb.23071
Subject(s) - bioelectrical impedance analysis , medicine , concordance , dual energy x ray absorptiometry , overweight , correlation coefficient , pearson product moment correlation coefficient , concordance correlation coefficient , nuclear medicine , limits of agreement , body fat percentage , correlation , coefficient of variation , body mass index , dual energy , mathematics , statistics , bone mineral , osteoporosis , geometry
Objectives To verify the validity of multi‐frequency bioelectrical impedance analysis (mBCA) for predicting body fat percentage (BF%) in overweight/obese adults using dual‐energy X‐ray absorptiometry (DXA) as the reference method. Methods Forty‐eight adults participated (54% women, mean age = 41.0 ± 7.3 years old). The Pearson's correlation coefficient was used to evaluate the correlation between BIA and BF% assessed by DXA. The concordance between BF% measured by both methods was obtained with Lin's concordance correlation coefficient and Bland–Altman difference plots. Results Measures of BF% were estimated as 39.0 (SD = 6.1) and 38.3 (SD = 6.5) using DXA and mBCA, respectively. The Pearson's correlation coefficient reflected a strong correlation ( r =.921, P = .001). The paired t ‐test showed a significant mean difference between these methods for obese men BF% of −0.6 [(SD 1.95; 95% CI = −4.0 to 3.0), P =.037]. Overall, the bias of the mBCA was −0.6 [(SD 2.2; 95% CI = −5.0 to 3.7), P =.041], which indicated that the mBCA method significantly underestimated BF% in comparison to the reference method. Finally, in both genders, Lin's concordance correlation coefficient showed a strong agreement. More specifically the DXA value was ρc = 0.943 (95% CI = 0.775 to 0.950) and the mBCA value was ρc = 0.948 (95% CI = 0.778 to 0.978). Conclusions Our analysis showed a strong agreement between the two methods as reflected in the range of BF%. These results show that mBCA and DXA are comparable methods for measuring body composition with higher body fat percentages. However, due to broad limits of agreement, we can only recommend mBCA for groups of populations.