Open AccessBody composition and prediction equations using skinfold thickness for body fat percentage in Southern Brazilian adolescents
Author(s) -
Wagner Luis Ripka,
Leandra Ulbricht,
Pedro Miguel Gewehr
Publication year - 2017
Publication title -
plos one
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.99
H-Index - 332
ISSN - 1932-6203
DOI - 10.1371/journal.pone.0184854
Subject(s) - waist , medicine , overweight , circumference , body mass index , classification of obesity , obesity , body fat percentage , skinfold thickness , dual energy x ray absorptiometry , anthropometry , body adiposity index , demography , fat mass , zoology , mathematics , biology , bone mineral , geometry , osteoporosis , sociology
Objectives The purpose of this study was to: a) determine the nutritional status of Brazilian adolescents, and; b) present a skinfold thickness model (ST) to estimate body fat developed with Brazilian samples, using dual energy x-ray absorptiometry (DXA) as reference method. Methods The main study group was composed of 374 adolescents, and further 42 adolescents for the validation group. Weight, height, waist circumference measurements, and body mass index (BMI) were collected, as well as nine ST–biceps (BI), triceps (TR), chest (CH), axillary (AX) subscapularis (SB), abdominal (AB), suprailiac (SI), medial thigh (TH), calf (CF), and fat percentage (%BF) obtained by DXA. Results The prevalence of overweight in adolescents was 20.9%, and obesity 5.8%. Regression analysis through ordinary least square method (OLS) allowed obtainment of three equations with values of R 2 = 0.935, 0.912 and 0.850, standard error estimated = 1.79, 1.78 and 1.87, and bias = 0.06, 0.20 and 0.05, respectively. Conclusion the innovation of this study lies in presenting new regression equations for predicting body fat in Southern Brazilian adolescents based on a representative and heterogeneous sample from DXA.