Dept of Psychology, Washington State University-Vancouver, Vancouver, WA, USA.
J Phys Act Health. 2013 Feb;10(2):271-9. doi: 10.1123/jpah.10.2.271. Epub 2012 Feb 29.
Maximal oxygen uptake (VO2max), an assessment of cardiorespiratory fitness, is regularly used as the primary outcome in exercise interventions. Many criteria have been suggested for validating such tests-most commonly, a plateau in oxygen consumption. The current study investigated the proportion of inactive individuals who reached a plateau in oxygen uptake and who achieved a valid test as assessed by secondary criteria (RERmax ≥ 1.1; RPEmax ≥ 18; age predicted HRmax ±10bpm), and the correlates of a successful plateau or achievement of secondary criteria during a VO2max session.
Participants (n = 240) were inactive individuals who completed VO2max assessments using an incremental treadmill test. We explored physical, behavioral, and motivational factors as predictors of meeting criteria for meeting a valid test.
Approximately 59% of the sample achieved plateau using absolute (increase of VO2 of 150ml O2 or less) and 37% achieved plateau using relative (increase of VO2 of 1.5ml/kg O2 or less) criteria. Being male, having a higher BMI, a greater waist-to-hip ratio, and increased self-efficacy were associated with lower odds of achieving an absolute plateau, whereas none of these factors predicted odds of achieving relative plateau.
Findings raise questions about the validity of commonly used criteria with less active populations.
最大摄氧量（VO2max）是心肺功能的评估指标，常用于运动干预的主要结果。已经提出了许多验证此类测试的标准-最常见的是耗氧量的平台。本研究调查了达到摄氧量平台并通过次要标准（RERmax ≥ 1.1；RPEmax ≥ 18；年龄预测 HRmax ±10bpm）评估达到有效测试的不活跃个体的比例，以及在 VO2max 期间成功达到平台或达到次要标准的相关性。
参与者（n = 240）为不活跃个体，使用增量跑步机测试完成 VO2max 评估。我们探讨了身体、行为和动机因素作为满足有效测试标准的预测因素。
大约 59%的样本使用绝对值（VO2 增加 150ml O2 或更少）达到平台，37%的样本使用相对值（VO2 增加 1.5ml/kg O2 或更少）达到平台。男性、更高的 BMI、更大的腰臀比和更高的自我效能与达到绝对平台的可能性降低相关，而这些因素都没有预测达到相对平台的可能性。
研究结果对不活跃人群中常用标准的有效性提出了质疑。
