Allen P D, Pandolf K B
Med Sci Sports. 1977 Summer;9(2):122-7.
The effect of an enriched inspired oxygen concentration on perceived exertion (RPE) was investigated while running at two submaximal treadmill loads. Twelve males (VO2 max = 49.3 ml/kg-min) worked at 50% and 80% VO2 max, breathing either air or 80% O2-20% N2 in random order using a single blind technique. Subjects were evaluated while running for 10 min and during a 20 min recovery. Heart rate (HR), ventilation (VE), respiration rate (RR), tidal volume (VT) and RPE were measured before, during and after work. Blood lactate was measured 1 min after work. Oxygen concentration did not statistically affect HR, VE, RR or VT during exercise or recovery. At both loads, RPE at the end of exercise was significantly reduced breathing the hyperoxic mixture. At 50% VO2 max, mean RPE decreased from 11.2 breathing room air to 9.6 breathing 80% O2 and, 80% VO2 max, from 13.8 to 11.7 (P less than 0.01). Blood lactates were significantly reduced breathing 80% O2; from 23.4 mg to 13.3 at 50% VO2 max and from 55.5 to 36.5 at 80% VO2 max (P less than 0.01). The RPE correlated with lactate (r=0.64) at the end of work. Results indicate that during moderate and heavy work RPE is significantly affected by the inspired O2 concentration and there is a significant relationship between RPE and blood lactate.
在两个亚最大跑步机负荷下跑步时，研究了高浓度吸入氧对自觉用力程度（RPE）的影响。12名男性（最大摄氧量=49.3毫升/千克·分钟）以最大摄氧量的50%和80%进行运动，采用单盲技术随机顺序呼吸空气或80%氧气-20%氮气。在跑步10分钟期间及20分钟恢复期间对受试者进行评估。在工作前、工作期间和工作后测量心率（HR）、通气量（VE）、呼吸频率（RR）、潮气量（VT）和RPE。工作后1分钟测量血乳酸。在运动或恢复过程中，氧气浓度对HR、VE、RR或VT无统计学影响。在两种负荷下，运动结束时呼吸高氧混合气时的RPE均显著降低。在50%最大摄氧量时，平均RPE从呼吸室内空气时的11.2降至呼吸80%氧气时的9.6；在80%最大摄氧量时，从13.8降至11.7（P<0.01）。呼吸80%氧气时血乳酸显著降低；在50%最大摄氧量时从23.4毫克降至13.3，在80%最大摄氧量时从55.5降至36.5（P<0.01）。工作结束时RPE与乳酸相关（r=0.64）。结果表明，在中度和重度工作期间，吸入氧浓度显著影响RPE，且RPE与血乳酸之间存在显著关系。
