Bettery LifeLab, Bettery S.A., Porto Salvo, 2740-262 Lisboa, Portugal.
Research Center on Sports, Physical Education, Exercise and Health (CIDEFES), Universidade Lusófona, 1749-024 Lisboa, Portugal.
Nutrients. 2022 Oct 27;14(21):4514. doi: 10.3390/nu14214514.
This study aimed to (i) characterise the body composition of professional and semi-professional male futsal players, (ii) assess the validity of commonly used equations to estimate FM%, (iii) develop and cross-validate a futsal-specific FM% prediction equation. In a cross-sectional design, 78 adult male futsal players were assessed for body mass, stature, skinfolds, and girths as per the International Society for the Advancement of Kinanthropometry protocol and completed a dual-energy X-ray absorptiometry (DXA) scan for reference body composition data. Using paired-sample t-tests, the FM% from the DXA and nine published equations were compared. New sport-specific models were developed by stepwise multiple regression. Existing equations were cross-validated using the least squares regression, concordance correlation coefficient, and the Bland−Altman analyses. New equations were further cross-validated using the PRESS approach. None of the existing equations accurately predicted the DXA-derived FM% (p < 0.001; R2 ≤ 0.76, SEE ≥ 1.59; CCC ≤ 0.83; bias = −8.2% to −1.3%, limited agreement, and varying trends). The novel Bettery® equation: −0.620 + (0.159 ∗ Σ4SKF [triceps, abdominal, iliac crest, and front thigh (mm)]) + (0.120 ∗ waist girth (cm)), demonstrated a high accuracy (R2 = 0.85, SEE = 1.32%), a moderate strength of agreement (CCC = 0.92), no bias (0.2%), good agreement (±2.5%), and no trend (r = −0.157; p = 0.170) against the DXA. The Bettery® equation is the first to allow for a valid and sport-specific assessment of FM% in male futsal players.
(i) 描述职业和半职业男子五人制足球运动员的身体成分，(ii) 评估常用方程估算体脂肪百分比（FM%）的有效性，(iii) 开发和交叉验证五人制足球特有的 FM%预测方程。在一项横断面设计中，78 名成年男性五人制足球运动员按照国际运动人体测量学会的协议评估了体重、身高、皮褶厚度和围度，并完成了双能 X 射线吸收法（DXA）扫描以获取参考身体成分数据。使用配对样本 t 检验比较了 DXA 和九个已发表方程得出的 FM%。通过逐步多元回归开发新的特定于运动的模型。使用最小二乘回归、一致性相关系数和 Bland−Altman 分析对现有的方程进行交叉验证。使用 PRESS 方法进一步对新方程进行交叉验证。没有一个现有的方程能准确预测 DXA 得出的 FM%（p<0.001；R2≤0.76，SEE≥1.59；CCC≤0.83；偏倚=−8.2%至−1.3%，一致性有限，趋势不同）。新的 Bettery®方程：−0.620 + (0.159 ∗ Σ4SKF [三头肌、腹部、髂嵴和前大腿（mm）]) + (0.120 ∗ 腰围（cm）)]，表现出很高的准确性（R2=0.85，SEE=1.32%），中等强度的一致性（CCC=0.92），没有偏差（0.2%），良好的一致性（±2.5%），没有趋势（r=−0.157；p=0.170）与 DXA 相比。Bettery®方程是第一个允许对男性五人制足球运动员的 FM%进行有效和特定于运动的评估的方程。
