Bennett Hunter, Davison Kade, Parfitt Gaynor, Eston Roger
Alliance for Research in Exercise, Nutrition and Activity, Sansom Institute for Health Research, Universitiy of South Australia, Adelaide, Australia.
Eur J Appl Physiol. 2016 Dec;116(11-12):2337-2344. doi: 10.1007/s00421-016-3485-9. Epub 2016 Oct 5.
To determine whether maximal oxygen uptake (VOmax) could be predicted accurately and reliably from a 2-step, perceptually-regulated exercise test (PRET) in healthy adults.
Sixteen participants (31.7 ± 11.3 years, 3 females) completed three PRETs (separated by 24-72 h) and one maximal, perceptually-regulated, graded exercise test (PRETmax) on a motorized treadmill. Oxygen uptake (VO) and heart rate (HR) were recorded during each test. VO values for RPE range 9-15 were extrapolated to RPE 20 and age-predicted maximal HR (HRmax) using individual linear regression analysis to predict VOmax values compared to measured VOmax.
VO and HR values were consistent between each of four RPE levels of the PRET. ICC values ranged between 0.76 and 0.85. Predicted VOmax from both methods were lower than measured VOmax (p < 0.01). Limits of agreement (LoA) for measured (41.4 ± 5.3 ml kg min) versus predicted VOmax from each of the three PRETs using RPE20 were -1.2 ± 15.6, -1.0 ± 7.2 and -2.1 ± 5.5 and for HRmax were -1.8 ± 4.2; -2.6 ± 4.2 and -2.4 ± 4.4 ml kg min for PRET 1, 2 and 3, respectively.
The step PRET elicited significant and reliable increases in VO across the four RPE levels, but under-estimated treadmill VOmax. However, there was better agreement between measured and predicted VOmax when extrapolated to HRmax. As evidence indicates the underestimation of VOmax is explained by the difference in the mode of exercise, the step PRET provides a simple and convenient test of cardiorespiratory fitness.
确定在健康成年人中，能否通过两步、感知调节运动试验（PRET）准确可靠地预测最大摄氧量（VOmax）。
16名参与者（年龄31.7±11.3岁，3名女性）在电动跑步机上完成了三次PRET（间隔24 - 72小时）和一次最大、感知调节的分级运动试验（PRETmax）。每次试验期间记录摄氧量（VO）和心率（HR）。使用个体线性回归分析，将自感用力度（RPE）范围为9 - 15时的VO值外推至RPE 20和年龄预测的最大心率（HRmax），以预测VOmax值，并与测量的VOmax进行比较。
PRET的四个RPE水平中，每个水平的VO和HR值均具有一致性。组内相关系数（ICC）值在0.76至0.85之间。两种方法预测的VOmax均低于测量的VOmax（p < 0.01）。使用RPE20时，三次PRET中每次测量的VOmax（41.4±5.3 ml·kg·min）与预测的VOmax之间的一致性界限（LoA）分别为-1.2±15.6、-1.0±7.2和-2.1±5.5，HRmax的一致性界限分别为-1.8±4.2；-2.6±4.2和-2.4±4.4 ml·kg·min。
两步PRET在四个RPE水平上引起VO显著且可靠的增加，但低估了跑步机VOmax。然而，外推至HRmax时，测量的和预测的VOmax之间的一致性更好。由于有证据表明VOmax的低估是由运动方式的差异所解释的，因此两步PRET为心肺适能提供了一种简单便捷的测试方法。
