次最大运动以常氧和高氧最大摄氧量的百分比来量化。

Submaximal exercise quantified as percent of normoxic and hyperoxic maximum oxygen uptakes.

作者信息

Byrnes W C, Mihevic P M, Freedson P S, Horvath S M

出版信息

Med Sci Sports Exerc. 1984 Dec;16(6):572-7.

Abstract

Maximum oxygen uptake (VO2max) was measured in six college-aged males under normoxic (NVO2max) and hyperoxic (HVO2max; 70% oxygen) conditions. Subjects then randomly performed the following three 20-min submaximal exercise bouts: 75% normoxic VO2max under normoxia (NVO2N), 75% normoxic VO2max under hyperoxia (NVO2H), and 75% hyperoxic VO2max under hyperoxia (HVO2H). Metabolic parameters were obtained at 5-min intervals. Hyperoxia resulted in a 13% increase (P less than 0.01) in VO2max (NVO2max = 3.54 l X min-1 vs HVO2max = 4.00 l X min-1). Significant (P less than 0.05) decreases were observed in VE (ventilation) (13%), epinephrine (37%), norepinephrine (26%), and blood lactate (28%), with no change in oxygen uptake (VO2), carbon dioxide production (VCO2), or respiratory exchange ratio (R) during hyperoxia at the same absolute power output (NVO2N vs NVO2H). However, at the same relative power outputs (NVO2N vs HVO2H) no significant changes in VE, epinephrine, norepinephrine, or blood lactate were observed when hyperoxia and normoxia were compared.

摘要

在常氧（NVO2max）和高氧（HVO2max；70%氧气）条件下，对6名大学年龄男性的最大摄氧量（VO2max）进行了测量。受试者随后随机进行了以下三次20分钟的次最大运动试验：常氧下75%常氧VO2max（NVO2N）、高氧下75%常氧VO2max（NVO2H）以及高氧下75%高氧VO2max（HVO2H）。每隔5分钟获取代谢参数。高氧导致VO2max增加了13%（P<0.01）（NVO2max = 3.54升/分钟 vs HVO2max = 4.00升/分钟）。观察到通气量（VE）（13%）、肾上腺素（37%）、去甲肾上腺素（26%）和血乳酸（28%）显著（P<0.05）降低，在相同绝对功率输出下高氧期间摄氧量（VO2）、二氧化碳产生量（VCO2）或呼吸交换率（R）无变化（NVO2N vs NVO2H）。然而，在相同相对功率输出下（NVO2N vs HVO2H），比较高氧和常氧时，未观察到VE、肾上腺素、去甲肾上腺素或血乳酸有显著变化。