Department of Kinesiology, Michigan State University, East Lansing, Michigan 48824, USA.
Am J Prev Med. 2011 Oct;41(4 Suppl 2):S106-10. doi: 10.1016/j.amepre.2011.07.005.
Although aerobic fitness has been well studied, establishing developmental patterns from previous studies has some limitations including selection bias and the statistical modeling of growth-related data.
The purpose of this study was to develop age-, gender-, and race-specific smoothed percentiles for aerobic fitness using the LMS (L=skewness, M=median, and S=coefficient of variation) statistical procedure in a large, multiethnic, nationally representative sample of U.S. adolescents aged 12-18 years.
Data from the National Health and Nutrition Examination Survey (NHANES [1999-2000 and 2001-2002]) were combined. In all, 2997 subjects (1478 boys and 1519 girls) completed a treadmill exercise test from which maximal oxygen consumption (VO(2)max) was estimated from heart rate response. Percentile curves were determined by using the LMS procedure, which fits smooth percentile curves to reference data.
Separate LMS curves were initially prepared for each gender and race; however, since the overall distribution of the data was not different for whites, blacks, and Hispanics, the participants were combined, and separate centile curves were prepared for boys and girls. Specific percentile values were created from the LMS curves, and the age- and gender-specific values for LMS are provided for calculation of individual z-scores (SD scores). In general, there is a slight increase in estimated VO(2)max of boys aged 12-15 years and then it remains stable. In girls, there is slight decrease in estimated VO(2)max across ages 12-18 years. Boys have higher values than girls at every age-specific percentile.
This study presents age- and gender-specific percentiles for U.S. youth aged 12-18 years based on NHANES (1999-2002), and adds to the recent application of the LMS statistical procedure for the construction of growth percentiles for a variety of outcomes. Comparisons are made to current FITNESSGRAM(®) thresholds.
尽管有氧运动能力已经得到了很好的研究，但从先前的研究中建立发展模式存在一些局限性，包括选择偏差和与生长相关的数据的统计建模。
本研究的目的是使用 LMS（L=偏度，M=中位数，S=变异系数）统计程序，在一个大型的、多民族的、具有全国代表性的美国青少年样本中，为 12-18 岁的青少年制定年龄、性别和种族特异性的有氧运动能力平滑百分位数。
数据来自国家健康和营养检查调查（NHANES[1999-2000 年和 2001-2002 年]）。共有 2997 名受试者（1478 名男孩和 1519 名女孩）完成了跑步机运动测试，从中根据心率反应估算最大摄氧量（VO2max）。百分位曲线是通过使用 LMS 程序确定的，该程序将平滑的百分位曲线拟合到参考数据上。
最初为每个性别和种族准备了单独的 LMS 曲线；然而，由于白人、黑人和西班牙裔的总体数据分布没有差异，因此将参与者合并，并为男孩和女孩准备了单独的百分位曲线。从 LMS 曲线中创建了特定的百分位值，并提供了 LMS 的年龄和性别特异性值，用于计算个体 z 分数（SD 分数）。一般来说，12-15 岁男孩的估计 VO2max 略有增加，然后保持稳定。在女孩中，12-18 岁的估计 VO2max 略有下降。在每个特定年龄的百分位中，男孩的值都高于女孩。
本研究基于 NHANES（1999-2002 年）为 12-18 岁的美国青少年提供了年龄和性别特异性的百分位数，并为 LMS 统计程序在构建各种结果的生长百分位数方面的最新应用做出了贡献。与当前的 FITNESSGRAM®阈值进行了比较。
