Midgley Adrian W, McNaughton Lars R, Carroll Sean
Applied Physiology Laboratory, Department of Sport, Health and Exercise Science, University of Hull, Hull, UK.
Clin Physiol Funct Imaging. 2007 Mar;27(2):122-5. doi: 10.1111/j.1475-097X.2007.00725.x.
Limited research has investigated the most appropriate oxygen uptake (VO2) data averaging method to obtain reliable and valid maximal oxygen uptake (VO2max) values. This study investigated the effect of the VO2 time-averaging interval on the reproducibility of VO2max.
Twenty-two competitive distance runners (six female) performed two identical incremental treadmill tests to their limit of exercise tolerance separated by at least 48 h. Commencing at 7 km h(-1), running speed was increased by 1 km h(-1) per minute for five stages and 0.5 km h(-1) thereafter. Breath-by-breath VO2 data collected during each incremental test were time-averaged over 10-, 15-, 20-, 30- and 60-s and the highest averaged VO2 value was regarded as VO2max for each time-averaging interval. The VO2max values derived from different VO2 time-averaging intervals were significantly different for the first (F = 39.6; P<0.001) and second (F = 68.9; P<0.001) incremental test. There was a tendency for VO2max to significantly increase as the time-averaging interval became shorter. The reproducibility of VO2max was similar for all five VO2 time-averages, with no significant differences between the within-subject variance (F = 0.4; P = 0.6).
The results of this study suggests that the reproducibility of VO2max is not affected by the length of the VO2 time-average interval. However, VO2max was significantly altered by changing the VO2 time-averaging interval between 10 and 60 s. Consistency in the VO2 time-averaging interval is therefore an important methodological consideration for repeated determinations of VO2max.
仅有有限的研究探讨了获取可靠且有效的最大摄氧量（VO₂max）值时最合适的摄氧量（VO₂）数据平均方法。本研究调查了VO₂时间平均间隔对VO₂max可重复性的影响。
22名竞技长跑运动员（6名女性）进行了两次相同的递增式跑步机测试，直至运动耐力极限，两次测试间隔至少48小时。从7公里/小时开始，速度每分钟增加1公里/小时，持续五个阶段，之后每分钟增加0.5公里/小时。每次递增测试期间收集的逐次呼吸VO₂数据在10秒、15秒、20秒、30秒和60秒的时间间隔内进行时间平均，每个时间平均间隔内最高的平均VO₂值被视为VO₂max。在第一次（F = 39.6；P<0.001）和第二次（F = 68.9；P<0.001）递增测试中，不同VO₂时间平均间隔得出的VO₂max值存在显著差异。随着时间平均间隔变短，VO₂max有显著增加的趋势。所有五个VO₂时间平均值下VO₂max的可重复性相似，受试者内方差之间无显著差异（F = 0.4；P = 0.6）。
本研究结果表明，VO₂max的可重复性不受VO₂时间平均间隔长度的影响。然而，在10到60秒之间改变VO₂时间平均间隔会显著改变VO₂max。因此，在重复测定VO₂max时，VO₂时间平均间隔的一致性是一个重要的方法学考虑因素。
