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Bioelectrical impedance underestimates total and truncal fatness in abdominally obese women.
Obesity (Silver Spring). 2006 Oct; 14(10):1731-8.O

Abstract

OBJECTIVE

To compare estimates of total and truncal fatness from eight-electrode bioelectrical impedance analysis equipment (BIA(8)) with those from DXA in centrally obese women. The secondary aim was to examine BMI and waist circumference (WC) as proxy measures for percentage total body fat (%TBF) and truncal body fat percentage (tr%BF).

RESEARCH METHODS AND PROCEDURES

This was a cross-sectional study of 136 women (age, 48.1 +/- 7.7 years; BMI, 30.4 +/- 2.9 kg/m(2); %TBF(DXA), 46.0 +/- 3.7%; WC, 104 +/- 8 cm). Fatness was measured by DXA and Tanita BC-418 equipment (Tanita Corp., Tokyo, Japan). Agreement among methods was assessed by Bland-Altman plots, and regression analysis was used to evaluate anthropometric measures as proxies for total and abdominal fatness.

RESULTS

The percentage of overweight subjects was 41.9%, whereas 55.9% of the subjects were obese, as defined by BMI, and all subjects had a WC exceeding the World Health Organization cut-off point for abdominal obesity. Compared with DXA, the BIA(8) equipment significantly underestimated total %BF (-5.0; -3.6 to -8.5 [mean; 95% confidence interval]), fat mass (-3.6; -3.9 to -3.2), and tr%BF (-8.5; -9.1 to -7.9). The discrepancies between the methods increased with increasing adiposity for both %TBF and tr%BF (both p < 0.001). Variation in BMI explained 28% of the variation in %TBF(DXA) and 51% of %TBF(BIA8). Using WC as a proxy for truncal adiposity, it explained only 18% of tr%BF(DXA) variance and 27% of tr%BF(BIA8) variance. The corresponding figures for truncal fat mass were 49% and 35%, respectively. No significant age effects were observed in any of the regressions.

DISCUSSION

BIA(8) underestimated both total and truncal fatness, compared with DXA, with higher dispersion for tr%BF than %TBF. The discrepancies increased with degree of adiposity, suggesting that the accuracy of BIA is negatively affected by obesity.

Authors+Show Affiliations

Obesity Unit, m73, Department of Medicine, Karolinska Institute, Karolinska University Hospital, SE-141 86 Stockholm, Sweden. Martin.neovius@ki.seNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

17062802

Citation

Neovius, Martin, et al. "Bioelectrical Impedance Underestimates Total and Truncal Fatness in Abdominally Obese Women." Obesity (Silver Spring, Md.), vol. 14, no. 10, 2006, pp. 1731-8.
Neovius M, Hemmingsson E, Freyschuss B, et al. Bioelectrical impedance underestimates total and truncal fatness in abdominally obese women. Obesity (Silver Spring). 2006;14(10):1731-8.
Neovius, M., Hemmingsson, E., Freyschuss, B., & Uddén, J. (2006). Bioelectrical impedance underestimates total and truncal fatness in abdominally obese women. Obesity (Silver Spring, Md.), 14(10), 1731-8.
Neovius M, et al. Bioelectrical Impedance Underestimates Total and Truncal Fatness in Abdominally Obese Women. Obesity (Silver Spring). 2006;14(10):1731-8. PubMed PMID: 17062802.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Bioelectrical impedance underestimates total and truncal fatness in abdominally obese women. AU - Neovius,Martin, AU - Hemmingsson,Erik, AU - Freyschuss,Bo, AU - Uddén,Joanna, PY - 2006/10/26/pubmed PY - 2006/12/27/medline PY - 2006/10/26/entrez SP - 1731 EP - 8 JF - Obesity (Silver Spring, Md.) JO - Obesity (Silver Spring) VL - 14 IS - 10 N2 - OBJECTIVE: To compare estimates of total and truncal fatness from eight-electrode bioelectrical impedance analysis equipment (BIA(8)) with those from DXA in centrally obese women. The secondary aim was to examine BMI and waist circumference (WC) as proxy measures for percentage total body fat (%TBF) and truncal body fat percentage (tr%BF). RESEARCH METHODS AND PROCEDURES: This was a cross-sectional study of 136 women (age, 48.1 +/- 7.7 years; BMI, 30.4 +/- 2.9 kg/m(2); %TBF(DXA), 46.0 +/- 3.7%; WC, 104 +/- 8 cm). Fatness was measured by DXA and Tanita BC-418 equipment (Tanita Corp., Tokyo, Japan). Agreement among methods was assessed by Bland-Altman plots, and regression analysis was used to evaluate anthropometric measures as proxies for total and abdominal fatness. RESULTS: The percentage of overweight subjects was 41.9%, whereas 55.9% of the subjects were obese, as defined by BMI, and all subjects had a WC exceeding the World Health Organization cut-off point for abdominal obesity. Compared with DXA, the BIA(8) equipment significantly underestimated total %BF (-5.0; -3.6 to -8.5 [mean; 95% confidence interval]), fat mass (-3.6; -3.9 to -3.2), and tr%BF (-8.5; -9.1 to -7.9). The discrepancies between the methods increased with increasing adiposity for both %TBF and tr%BF (both p < 0.001). Variation in BMI explained 28% of the variation in %TBF(DXA) and 51% of %TBF(BIA8). Using WC as a proxy for truncal adiposity, it explained only 18% of tr%BF(DXA) variance and 27% of tr%BF(BIA8) variance. The corresponding figures for truncal fat mass were 49% and 35%, respectively. No significant age effects were observed in any of the regressions. DISCUSSION: BIA(8) underestimated both total and truncal fatness, compared with DXA, with higher dispersion for tr%BF than %TBF. The discrepancies increased with degree of adiposity, suggesting that the accuracy of BIA is negatively affected by obesity. SN - 1930-7381 UR - https://www.unboundmedicine.com/medline/citation/17062802/Bioelectrical_impedance_underestimates_total_and_truncal_fatness_in_abdominally_obese_women_ L2 - https://doi.org/10.1038/oby.2006.199 DB - PRIME DP - Unbound Medicine ER -