Korea Institute of Sport Science, 109, 727 Hwarang-ro, Nowon-gu, Seoul, 01794, South Korea.
Department of Counseling, Health, and Kinesiology, College of Education and Human Development, Texas A&M University-San Antonio, One University Way, STEM 142A, San Antonio, TX, 78224, USA.
Eur J Appl Physiol. 2019 May;119(5):1245-1252. doi: 10.1007/s00421-019-04115-8. Epub 2019 Mar 8.
To develop accurate and practical prediction models of maximal oxygen consumption (VOmax) using the Young Men's Christian Association (YMCA)-step test in South Korean adults.
In total, 568 adults (20-66 years) were included in this study. To develop and cross-validate prediction models of VOmax, the total sample was divided into 80% training and 20% testing using a simple random sampling method. VOmax was measured using the maximal-graded exercise treadmill test. Sex, age, 1-min recovery heart rate, body weight, and height were measured as potential predictors. Each test was conducted within a 2- to 3-day interval, ensuring sufficient rest. Preliminary prediction models were developed from training datasets, which were cross-validated using regression analyses and/or repeated-measures analysis of variance. The accuracy of prediction models was evaluated using R, standard error of estimate (SEE), and mean difference (MD) against a criterion-measured VOmax.
The average age and VOmax were 43.5 ± 12.9 years and 39.1 ± 7.5 ml/kg/min, respectively. For model development, three practical models with acceptable accuracy were developed (R = 0.56-0.61; SEE = 4.74-5.01). For model cross-validation, significant relationships between the criterion-measured and predicted VOmax were observed in all three models (R = 0.56-0.61; SEE = 4.62-4.88). The difference between criterion-measured and predicted VOmax was not significant in the models (MD =- 0.03 to - 0.14).
The prediction models included 3-5 variables as significant predictors of VOmax and had acceptable accuracy in a large sample of South Korean adults. The selected models provide a simple and practical method to estimate VOmax using the YMCA-step test for South Korean adults.
利用韩国成年人的基督教青年会（YMCA）台阶测试，开发准确实用的最大摄氧量（VOmax）预测模型。
本研究共纳入 568 名成年人（20-66 岁）。为了开发和交叉验证 VOmax 的预测模型，使用简单随机抽样法将总样本分为 80%的训练和 20%的测试。VOmax 使用最大分级运动平板测试测量。性别、年龄、1 分钟恢复期心率、体重和身高作为潜在预测因子进行测量。每项测试在 2-3 天的间隔内进行，确保有足够的休息。初步预测模型由训练数据集开发，使用回归分析和/或重复测量方差分析进行交叉验证。使用 R、估计标准误差（SEE）和与标准测量 VOmax 的平均差值（MD）评估预测模型的准确性。
平均年龄和 VOmax 分别为 43.5±12.9 岁和 39.1±7.5ml/kg/min。对于模型开发，开发了三个具有可接受准确性的实用模型（R=0.56-0.61；SEE=4.74-5.01）。对于模型交叉验证，所有三个模型中都观察到标准测量和预测 VOmax 之间存在显著关系（R=0.56-0.61；SEE=4.62-4.88）。在模型中，标准测量和预测 VOmax 之间的差异不显著（MD=-0.03 至-0.14）。
预测模型包含 3-5 个变量作为 VOmax 的显著预测因子，在韩国成年人的大样本中具有可接受的准确性。选择的模型为使用 YMCA 台阶测试估计韩国成年人的 VOmax 提供了一种简单实用的方法。
