Department of Kinesiology and Health Promotion, University of Kentucky, Lexington, KY.
Med Sci Sports Exerc. 2023 Jun 1;55(6):1063-1068. doi: 10.1249/MSS.0000000000003127. Epub 2023 Jan 14.
A square-wave verification bout to confirm maximal oxygen uptake (V̇O 2max ) from a graded exercise test (GXT) has been recommended based on mean responses. This study used the test-retest reliability, mean, and individual differences between the highest V̇O 2 from the GXT (V̇O 2GXT ) and verification bout (V̇O 2verification ) to examine the efficacy of a verification bout in the determination of O 2max in healthy, recreationally trained, well-motivated men.
Ten men (24 ± 4 yr) completed a GXT on a cycle ergometer followed by a submaximal verification bout to determine V̇O 2GXT and V̇O 2verification . After completion of the initial GXT, subjects rested for 5 min then performed the verification bout at 90% of the peak power output from the initial GXT. Analyses included a two-way repeated-measures ANOVA, intraclass correlation coefficients (ICC 2,1 ), standard errors of the measurement (SEM), minimal differences (MD), and coefficients of variation (COV).
There was no test (test 1 vs test 2)-method (GXT vs verification) interaction ( P = 0.300) and no main effect for test ( P = 0.690), but there was a main effect for method ( P = 0.003). The V̇O 2GXT (46.0 mL⋅kg -1 ⋅min -1 ) was significantly greater than V̇O 2verification (43.9 mL⋅kg -1 ⋅min -1 ), collapsed across test. The V̇O 2GXT (ICC = 0.970, SEM = 1.63 mL⋅kg -1 ⋅min -1 , MD = 4.51 mL⋅kg -1 ⋅min -1 , COV = 3.54%) and the V̇O 2verification (ICC = 0.953, SEM = 1.87 mL⋅kg -1 ⋅min -1 , MD = 5.17 mL⋅kg -1 ⋅min -1 , COV = 4.25%) demonstrated "excellent" reliability. No subject exceeded the MD test-retest for V̇O 2GXT or V̇O 2verification . No subject had a V̇O 2verification that exceeded V̇O 2GXT by more than the MD, but two subjects had a V̇O 2GXT , which exceeded V̇O 2verification by more than the MD.
The excellent reliability of V̇O 2GXT in addition to the examination of the individual differences between V̇O 2GXT and V̇O 2verification using the MD indicated that a standalone GXT was sufficient to determine V̇O 2max .
基于均值反应，推荐使用方波验证回合来确认递增运动测试（GXT）中的最大摄氧量（V̇O2max）。本研究使用测试-再测试可靠性、均值和 GXT 中最高 V̇O2（V̇O2GXT）和验证回合（V̇O2verification）之间的个体差异，来检验验证回合在确定健康、有规律运动且积极性高的男性的 O2max 中的效果。
10 名男性（24 ± 4 岁）在固定自行车上完成 GXT，然后进行亚最大验证回合以确定 V̇O2GXT 和 V̇O2verification。初始 GXT 完成后，受试者休息 5 分钟，然后以初始 GXT 峰值功率输出的 90%进行验证回合。分析包括双因素重复测量方差分析、组内相关系数（ICC 2,1）、测量标准误差（SEM）、最小差异（MD）和变异系数（COV）。
无测试（测试 1 与测试 2）-方法（GXT 与验证）交互作用（P=0.300），也无测试主效应（P=0.690），但有方法主效应（P=0.003）。V̇O2GXT（46.0 mL⋅kg-1⋅min-1）明显大于 V̇O2verification（43.9 mL⋅kg-1⋅min-1），跨越测试的平均值。V̇O2GXT（ICC=0.970，SEM=1.63 mL⋅kg-1⋅min-1，MD=4.51 mL⋅kg-1⋅min-1，COV=3.54%）和 V̇O2verification（ICC=0.953，SEM=1.87 mL⋅kg-1⋅min-1，MD=5.17 mL⋅kg-1⋅min-1，COV=4.25%）显示出“优秀”的可靠性。没有受试者的 V̇O2GXT 或 V̇O2verification 的测试-再测试 MD 超过。没有受试者的 V̇O2verification 超过 V̇O2GXT 的 MD，但有两个受试者的 V̇O2GXT 超过 V̇O2verification 的 MD。
V̇O2GXT 的出色可靠性，加上使用 MD 对 V̇O2GXT 和 V̇O2verification 之间的个体差异进行检查，表明单独进行 GXT 足以确定 V̇O2max。
