Hagberg J M, Mullin J P, Nagle F J
J Appl Physiol Respir Environ Exerc Physiol. 1980 Mar;48(3):540-4. doi: 10.1152/jappl.1980.48.3.540.
This study was undertaken to determine the effects of exercise intensity and duration on the time course and magnitude of recovery O2. Eighteen men exercised at 50, 65, and 80% of maximal O2 consumption (VO2max) for 5 and 20 min. Each exercise bout was preceded and followed by cycling at 150 kpm.min-1, which established the base-line VO2 used in this study. The magnitude of the rapid component of recovery O2 was proportional to exercise intensity and was not altered by exercise duration. The slow component of recovery O2 was not significantly altered by exercise intensity or duration at 50 and 65% of VO2max. However, after 20 min of exercise at 80% of VO2max, the slow component of recovery 02 was 5 times (p less than 0.01) larger than after the 5-min exercise at 80% of VO2max. End-exercise blood lactate level was also higher after the 20-min bout at 80% of VO2max; however, at most, 30% of the difference between the magnitude of the slow components of recovery O2 after the 5- and 20-min rides at 80% of VO2max could be accounted for by lactate metabolism. The Q10 effect of temperature on metabolism could account for 60-70% of the slow components of recovery O2 at all work rates and durations. It could also account for the remaining 70% of the increase in the slow component after the 20-min exercise at 80% of VO2max.
本研究旨在确定运动强度和持续时间对恢复性耗氧量的时程和幅度的影响。18名男性分别以最大耗氧量（VO₂max）的50%、65%和80%进行5分钟和20分钟的运动。每次运动前和运动后均以150 kpm·min⁻¹的功率进行骑行，以此确定本研究中使用的基线VO₂。恢复性耗氧量快速成分的幅度与运动强度成正比，且不受运动持续时间的影响。在VO₂max的50%和65%时，恢复性耗氧量的慢速成分不受运动强度或持续时间的显著影响。然而，在以VO₂max的80%进行20分钟运动后，恢复性耗氧量的慢速成分比以VO₂max的80%进行5分钟运动后大5倍（p＜0.01）。在以VO₂max的80%进行20分钟运动后，运动结束时的血乳酸水平也更高；然而，在以VO₂max的80%进行5分钟和20分钟骑行后，恢复性耗氧量慢速成分幅度差异中，最多30%可由乳酸代谢解释。在所有工作强度和持续时间下，温度对代谢的Q₁₀效应可解释恢复性耗氧量慢速成分的60 - 70%。它也可解释在以VO₂max的80%进行20分钟运动后，慢速成分增加量的其余70%。
