训练有素和未经训练的受试者运动后过量耗氧量及恢复率

Excess postexercise oxygen consumption and recovery rate in trained and untrained subjects.

作者信息

Short K R, Sedlock D A

机构信息

Exercise Physiology Laboratory, Department of Health, Kinesiology, and Leisure Studies, Purdue University, West Lafayette, Indiana 47907, USA.

出版信息

J Appl Physiol (1985). 1997 Jul;83(1):153-9. doi: 10.1152/jappl.1997.83.1.153.

DOI:10.1152/jappl.1997.83.1.153

PMID:9216958

Abstract

The purpose of this study was to determine whether aerobic fitness level would influence measurements of excess postexercise oxygen consumption (EPOC) and initial rate of recovery. Twelve trained [Tr; peak oxygen consumption (VO2 peak) = 53.3 +/- 6.4 ml . kg-1 . min-1] and ten untrained (UT; VO2 peak = 37.4 +/- 3.2 ml . kg-1 . min-1) subjects completed two 30-min cycle ergometer tests on separate days in the morning, after a 12-h fast and an abstinence from vigorous activity of 24 h. Baseline metabolic rate was established during the last 10 min of a 30-min seated preexercise rest period. Exercise workloads were manipulated so that they elicited the same relative, 70% VO2 peak (W70%), or the same absolute, 1.5 l/min oxygen uptake (VO2) (W1.5), intensity for all subjects, respectively. Recovery VO2, heart rate (HR), and respiratory exchange ratio (RER) were monitored in a seated position until baseline VO2 was reestablished. Under both exercise conditions, Tr had shorter EPOC duration (W70% = 40 +/- 15 min, W1.5 = 21 +/- 9 min) than UT (W70% = 50 +/- 14 min; W1.5 = 39 +/- 14 min), but EPOC magnitude (Tr: W70% = 3.2 +/- 1.0 liters O2, W1.5 = 1.5 +/- 0.6 liters O2; UT: W70% = 3.5 +/- 0.9 liters O2, W1.5 = 2.4 +/- 0.6 liters O2) was not different between groups. The similarity of Tr and UT EPOC accumulation in the W70% trial is attributed to the parallel decline in absolute VO2 during most of the initial recovery period. Tr subjects had faster relative decline during the fast-recovery phase, however, when a correction for their higher exercise VO2 was taken. Postexercise VO2 was lower for Tr group for nearly all of the W1.5 trial and particularly during the fast phase. Recovery HR kinetics were remarkably similar for both groups in W70%, but recovery was faster for Tr during W1.5. RER values were at or below baseline throughout much of the recovery period in both groups, with UT experiencing larger changes than Tr in both trials. These findings indicate that Tr individuals have faster regulation of postexercise metabolism when exercising at either the same relative or same absolute work rate.

摘要

本研究的目的是确定有氧适能水平是否会影响运动后过量氧耗（EPOC）的测量值和初始恢复率。12名受过训练的受试者[Tr；峰值摄氧量（VO₂峰值）=53.3±6.4 ml·kg⁻¹·min⁻¹]和10名未经训练的受试者（UT；VO₂峰值=37.4±3.2 ml·kg⁻¹·min⁻¹）在早晨不同的日子里，经过12小时禁食和24小时避免剧烈活动后，完成了两次30分钟的自行车测力计测试。在30分钟的运动前坐姿休息期的最后10分钟建立基础代谢率。对运动负荷进行调整，以使所有受试者分别达到相同的相对强度，即70%VO₂峰值（W70%），或相同的绝对强度，即1.5 l/min摄氧量（VO₂）（W1.5）。在坐姿下监测恢复过程中的VO₂、心率（HR）和呼吸交换率（RER），直到VO₂恢复到基础水平。在两种运动条件下，Tr组的EPOC持续时间较短（W70%=40±15分钟，W1.5=21±9分钟），短于UT组（W70%=50±14分钟；W1.5=39±14分钟），但两组之间的EPOC量（Tr组：W70%=3.2±1.0升O₂，W1.5=1.5±0.6升O₂；UT组：W70%=3.5±0.9升O₂，W1.5=2.4±0.6升O₂）没有差异。在W70%试验中，Tr组和UT组EPOC积累的相似性归因于初始恢复期大部分时间内绝对VO₂的平行下降。然而，在快速恢复阶段，当对Tr组较高的运动VO₂进行校正时，Tr组受试者的相对下降速度更快。在几乎整个W1.5试验期间，特别是在快速阶段，Tr组的运动后VO₂较低。在W70%试验中，两组的恢复HR动力学非常相似，但在W1.5试验中，Tr组的恢复速度更快。在两个试验的大部分恢复期间，两组的RER值均处于或低于基础水平，UT组的变化比Tr组更大。这些发现表明，当以相同的相对或绝对工作率运动时，受过训练的个体运动后代谢的调节更快。