Graduate Institute of Sports Science, National Taiwan Sport University, Taoyuan 333325, Taiwan.
Department of Sport Promotion, National Taiwan Sport University, Taoyuan 333325, Taiwan.
Int J Environ Res Public Health. 2022 Jan 5;19(1):563. doi: 10.3390/ijerph19010563.
The maximal oxygen uptake (VO) prediction models established by step tests are often used for evaluating cardiorespiratory fitness (CRF). However, it is unclear which type of stepping frequency sequence is more suitable for the public to assess the CRF. Therefore, the main purpose of this study was to test the effectiveness of two 3-min incremental step-in-place (3MISP) tests (i.e., 3MISP and 3MISP) with the same total number of steps but different step-frequency sequences in predicting VO. In this cross-sectional study, a total of 200 healthy adults in Taiwan completed 3MISP and 3MISP tests, as well as cardiopulmonary exercise testing. The 3MISP and 3MISP models were established through multiple stepwise regression analysis by gender, age, percent body fat, and 3MISP-heart rate. The statistical analysis included Pearson's correlations, the standard errors of estimate, the predicted residual error sum of squares, and the Bland-Altman plot to compare the measured VO values and those estimated. The results of the study showed that the exercise intensity of the 3MISP test was higher than that of the 3MISP test (% heart rate reserve (HRR) during 3MISP vs. %HRR during 3MISP = 81.00% vs. 76.81%, < 0.001). Both the 3MISP model and the 3MISP model explained 64.4% of VO, and the standard errors of the estimates were 4.2043 and 4.2090 mL·kg·min, respectively. The cross-validation results also indicated that the measured VO values and those predicted by the 3MISP and 3MISP models were highly correlated (3MISP model: r = 0.804, 3MISP model: r = 0.807, both < 0.001). There was no significant difference between the measured VO values and those predicted by the 3MISP and 3MISP models in the testing group ( > 0.05). The results of the study showed that when the 3MISP test was used, the exercise intensity was significantly reduced, but the predictive effectiveness of VO did not change. We concluded that the 3MISP test was physiologically less stressful than the 3MISP test, and it could be a better choice for CRF evaluation.
最大摄氧量（VO）预测模型通常通过台阶测试建立，用于评估心肺功能（CRF）。然而，目前尚不清楚哪种类型的台阶频率序列更适合公众评估 CRF。因此，本研究的主要目的是测试两种 3 分钟递增台阶测试（3MISP）（即 3MISP 和 3MISP）的有效性，这两种测试的总步数相同，但台阶频率序列不同，用于预测 VO。在这项横断面研究中，台湾的 200 名健康成年人完成了 3MISP 和 3MISP 测试以及心肺运动测试。通过性别、年龄、体脂百分比和 3MISP 心率对 3MISP 和 3MISP 模型进行多元逐步回归分析。统计分析包括 Pearson 相关系数、估计的标准误差、预测残差平方和以及 Bland-Altman 图，以比较测量的 VO 值和估计值。研究结果表明，3MISP 测试的运动强度高于 3MISP 测试（3MISP 时的%心率储备（HRR）vs. 3MISP 时的%HRR = 81.00% vs. 76.81%，<0.001）。3MISP 模型和 3MISP 模型分别解释了 64.4%的 VO，估计的标准误差分别为 4.2043 和 4.2090 mL·kg·min。交叉验证结果也表明，3MISP 和 3MISP 模型预测的测量 VO 值与测量 VO 值高度相关（3MISP 模型：r = 0.804，3MISP 模型：r = 0.807，均<0.001）。在测试组中，测量的 VO 值与 3MISP 和 3MISP 模型预测的 VO 值之间没有显著差异（>0.05）。研究结果表明，当使用 3MISP 测试时，运动强度显著降低，但 VO 的预测效果没有改变。我们得出结论，3MISP 测试的生理压力小于 3MISP 测试，它可能是评估 CRF 的更好选择。
