Physical Education Department, Viçosa Federal University, Brazil.
Res Q Exerc Sport. 2009 Sep;80(3):575-82. doi: 10.1080/02701367.2009.10599596.
The purpose of this study was to verify within- and between-day repeatability and variability in children's oxygen uptake (VO2), gross economy (GE; VO2 divided by speed) and heart rate (HR) during treadmill walking based on self-selected speed (SS). Fourteen children (10.1 +/- 1.4 years) undertook three testing sessions over 2 days in which four walking speeds, including SS were tested. Within- and between-day repeatability were assessed using the Bland and Altman method, and coefficients of variability (CV) were determined for each child across exercise bouts and averaged to obtain a mean group CV value for VO2, GE, and HR per speed. Repeated measures analysis of variance showed no statistically significant differences in within- or between-day CV for VO2, GE, or HR at any speed. Repeatability within- and between-day for VO2, GE, and HR for all speeds was verified. These results suggest that submaximal VO2 during treadmill walking is stable and reproducible at a range of speeds based on children's SS.
本研究旨在验证儿童在基于自身选择速度（SS）的跑步机行走过程中，其耗氧量（VO2）、总经济（GE；VO2 除以速度）和心率（HR）的日内和日间重复性和变异性。14 名儿童（10.1 +/- 1.4 岁）在 2 天内进行了 3 次测试，其中包括 4 种行走速度，包括 SS。日内和日间重复性使用 Bland 和 Altman 方法进行评估，并为每个孩子确定了在各个运动过程中的变异系数（CV），并将其平均以获得每个速度的 VO2、GE 和 HR 的平均组 CV 值。重复测量方差分析显示，在任何速度下，VO2、GE 或 HR 的日内和日间 CV 均无统计学差异。验证了所有速度下 VO2、GE 和 HR 的日内和日间重复性。这些结果表明，基于儿童的 SS，在跑步机行走过程中的亚最大 VO2 在一系列速度下是稳定且可重复的。
