Evaluation of the predictive capacity of vertical segmental tetrapolar bioimpedance for excess weight detection in adolescents

Neves, Felipe Silva; Leandro, Danielle Aparecida Barbosa; Silva, Fabiana Almeida da; Netto, Michele Pereira; Oliveira, Renata Maria Souza; Cândido, Ana Paula Carlos

doi:10.1016/j.jped.2015.01.006

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Sumário

• J. Pediatr. (Rio J.) 91 (6) • Nov-Dec 2015 • https://doi.org/10.1016/j.jped.2015.01.006 copy

Evaluation of the predictive capacity of vertical segmental tetrapolar bioimpedance for excess weight detection in adolescents^☆ ☆ Please cite this article as: Neves FS, Leandro DA, Silva FA, Netto MP, Oliveira RM, Cândido AP. Evaluation of the predictive capacity of vertical segmental tetrapolar bioimpedance for excess weight detection in adolescents. J Pediatr (Rio J). 2015;91:551-9.

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

Objective

To analyze the predictive capacity of the vertical segmental tetrapolar bioimpedance apparatus in the detection of excess weight in adolescents, using tetrapolar bioelectrical impedance as a reference.

Methods

This was a cross-sectional study conducted with 411 students aged between 10 and 14 years, of both genders, enrolled in public and private schools, selected by a simple and stratified random sampling process according to the gender, age, and proportion in each institution. The sample was evaluated by the anthropometric method and underwent a body composition analysis using vertical bipolar, horizontal tetrapolar, and vertical segmental tetrapolar assessment. The ROC curve was constructed based on calculations of sensitivity and specificity for each point of the different possible measurements of body fat. The statistical analysis used Student's t-test, Pearson's correlation coefficient, and McNemar's chi-squared test. Subsequently, the variables were interpreted using SPSS software, version 17.0.

Results

Of the total sample, 53.7% were girls and 46.3%, boys. Of the total, 20% and 12.5% had overweight and obesity, respectively. The body segment measurement charts showed high values of sensitivity and specificity and high areas under the ROC curve, ranging from 0.83 to 0.95 for girls and 0.92 to 0.98 for boys, suggesting a slightly higher performance for the male gender. Body fat percentage was the most efficient criterion to detect overweight, while the trunk segmental fat was the least accurate indicator.

Conclusion

The apparatus demonstrated good performance to predict excess weight.

KEYWORDS
Adolescent health; Body composition; Electric impedance; Obesity

Variables	Total		Girls		Boys		p ^b b Student's t-test.
	n ^a a The sample differences are justified by the occurrence of losses.	Mean ± SD	n ^a a The sample differences are justified by the occurrence of losses.	Mean ± SD	n ^a a The sample differences are justified by the occurrence of losses.	Mean ± SD
Age (years)	441	12.05 ± 1.36	237	12.11 ± 1.34	204	11.98 ± 1.38	0.318
Height (cm)	441	153.85 ± 10.04	237	154.07 ± 8.99	204	153.60 ± 11.15	0.629
Weight (kg)	441	47.64 ± 13.13	237	48.46 ± 13.41	204	46.68 ± 12.77	0.158
Body mass index (kg/m²)	441	19.92 ± 4.12	237	20.25 ± 4.52	204	19.53 ± 3.58	0.070
Waist circumference (cm)	436	67.21 ± 10.16	234	67.00 ± 10.38	202	67.45 ± 9.93	0.643
Vertical bipolar fat (%)	426	22.09 ± 8.92	230	25.36 ± 8.20	196	18.26 ± 8.20	<0.001
Tetrapolar horizontal fat (%)	441	23.90 ± 9.77	237	26.37 ± 10.21	204	21.03 ± 8.39	<0.001
TBF (%)	441	25.04 ± 7.37	237	28.53 ± 6.01	204	20.98 ± 6.72	<0.001
RASF (%)	439	34.62 ± 8.23	235	37.80 ± 7.79	204	30.96 ± 7.14	<0.001
LASF (%)	441	33.21 ± 7.46	237	35.78 ± 6.93	204	30.24 ± 6.95	<0.001
TSF (%)	438	12.70 ± 8.41	236	9.59 ± 8.33	202	16.33 ± 6.94	<0.001
RLSF (%)	441	30.65 ± 8.18	237	34.91 ± 6.45	204	25.69 ± 7.12	<0.001
LLSF (%)	441	30.65 ± 8.24	237	35.11 ± 6.34	204	25.13 ± 7.03	<0.001

Variables		TBF			RASF			LASF			TSF			RLSF			LLSF
		n ^a a The sample differences are justified by the occurrence of losses.	r ^b b Pearson's correlation coefficient.	p-value	n ^a a The sample differences are justified by the occurrence of losses.	r ^b b Pearson's correlation coefficient.	p-value	n ^a a The sample differences are justified by the occurrence of losses.	r ^b b Pearson's correlation coefficient.	p-value	n ^a a The sample differences are justified by the occurrence of losses.	r ^b b Pearson's correlation coefficient.	p-value	n ^a a The sample differences are justified by the occurrence of losses.	r ^b b Pearson's correlation coefficient.	p-value	n ^a a The sample differences are justified by the occurrence of losses.	r ^b b Pearson's correlation coefficient.	p-value
Age	Girls	237	0.04	0.544	235	−0.54	0.411	237	−0.10	0.121	236	−0.02	0.722	237	0.02	0.703	237	0.02	0.777
Age	Boys	204	−0.23	0.001	204	−0.35	<0.001	204	−0.39	<0.001	202	−0.16	0.021	204	−0.31	<0.001	204	−0.31	<0.001
Height	Girls	237	0.12	0.061	237	0.18	0.005	237	0.18	0.006	236	0.19	0.004	237	0.17	0.009	237	0.16	0.016
Height	Boys	204	−0.03	0.707	204	−0.17	0.017	204	−0.24	<0.001	202	<0.01	0.970	204	−0.10	0.161	204	-0.10	0.165
Weight	Girls	237	0.74	<0.001	235	0.69	<0.001	237	0.67	<0.001	236	0.60	<0.001	237	0.77	<0.001	237	0.72	<0.001
Weight	Boys	204	0.49	<0.001	204	0.33	<0.001	204	0.18	<0.001	202	0.45	<0.001	204	0.46	<0.001	204	0.45	<0.001
Body mass index	Girls	237	0.84	<0.001	237	0.76	<0.001	237	0.74	<0.001	236	0.65	<0.001	235	0.86	<0.001	237	0.82	<0.001
Body mass index	Boys	204	0.77	<0.001	204	0.64	<0.001	204	0.49	<0.001	202	0.67	<0.001	204	0.78	<0.001	204	0.77	<0.001
Waist circumference	Girls	234	0.77	<0.001	232	0.69	<0.001	234	0.70	<0.001	233	0.60	<0.001	234	0.80	<0.001	234	0.77	<0.001
Waist circumference	Boys	202	0.68	<0.001	202	0.56	<0.001	202	0.44	<0.001	200	0.59	<0.001	202	0.69	<0.001	202	0.69	<0.001
Vertical bipolar fat	Girls	230	0.85	<0.001	228	0.79	<0.001	230	0.77	<0.001	229	0.62	<0.001	230	0.91	<0.001	230	0.88	<0.001
Vertical bipolar fat	Boys	196	0.92	<0.001	196	0.87	<0.001	196	0.77	<0.001	194	0.78	<0.001	196	0.97	<0.001	196	0.97	<0.001
Horizontal tetrapolar fat	Girls	237	076	<0.001	235	0.71	<0.001	237	0.69	<0.001	236	0.55	<0.001	237	0.81	<0.001	237	0.78	<0.001
Horizontal tetrapolar fat	Boys	204	0.81	<0.001	204	0.76	<0.001	204	0.68	<0.001	202	0.71	<0.001	204	0.83	<0.001	204	0.83	<0.001

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[1] * Corresponding author. E-mail: anapaula.candido@ufjf.edu.br (A.P.C. Cândido).