Fonseca-Junior Sidnei Jorge, Oliveira Aldair J, Loureiro Luiz Lannes, Pierucci Anna Paola Trindade
1 Federal University of Rio de Janeiro.
2 Rio de Janeiro Rural Federal University.
Pediatr Exerc Sci. 2017 May;29(2):285-293. doi: 10.1123/pes.2016-0101. Epub 2016 Oct 5.
Body composition of adolescent athletes is often evaluated scientifically and in sports by using reference equations developed from nonathlete adolescent populations. The aim of this study was to analyze the validity of predictive equations based on skinfold measurements, as compared with dual-energy X-ray absorptiometry (DXA), to estimate body fat in adolescent modern pentathlon athletes.
51 athletes, 27 male (mean age = 15.1 years; standard deviation, SD = 1.5 years) and 24 female (mean age = 14.2 years; SD = 2.5 years), were assessed using DXA, anthropometric parameters, sports practice anamnesis, and pubertal stages. Agreement between methods was tested with boxplots of mean comparisons using Student's t test (p < .05), and Bland-Altman plots.
The body density equations of Durnin & Rahaman (1967) and Durnin & Womersley (1974) showed better agreement with DXA than the other predictive equations, for both females (difference between means=-2.03; 2SD = 8.44) and males (difference between means = 0.98; 2SD = 7.30). There were no mean differences between these equations and the reference method (DXA; p > .05), but they did display high variability (2SD).
The high variability among results indicated imprecision. Predictive skinfold equations developed for nonathlete adolescents do not offer good validity for modern adolescent pentathlon athletes, and should be avoided.
青少年运动员的身体成分通常通过使用从非运动员青少年群体得出的参考方程，在科学研究和体育领域进行评估。本研究的目的是分析基于皮褶测量的预测方程与双能X线吸收法（DXA）相比，用于估计现代五项全能青少年运动员体脂的有效性。
对51名运动员进行评估，其中27名男性（平均年龄 = 15.1岁；标准差，SD = 1.5岁）和24名女性（平均年龄 = 14.2岁；SD = 2.5岁），评估内容包括DXA、人体测量参数、运动训练史和青春期阶段。使用学生t检验（p < 0.05）的均值比较箱线图和布兰德-奥特曼图来检验方法之间的一致性。
对于女性（均值差异=-2.03；2SD = 8.44）和男性（均值差异 = 0.98；2SD = 7.30），Durnin & Rahaman（1967年）和Durnin & Womersley（1974年）的身体密度方程与DXA的一致性比其他预测方程更好。这些方程与参考方法（DXA；p > 0.05）之间没有均值差异，但它们确实显示出高变异性（2SD）。
结果之间的高变异性表明不精确。为非运动员青少年开发的预测皮褶方程对现代青少年五项全能运动员的有效性不佳，应避免使用。
