Department of Physical Education, Federal University of Sergipe (UFS), São Cristóvão, Sergipe 49100-000, Brazil.
Group of Studies and Research of Performance, Sport, Health and Paralympic Sports (GEPEPS), Federal University of Sergipe (UFS), São Cristóvão, Sergipe 49100-000, Brazil.
Int J Environ Res Public Health. 2021 Apr 25;18(9):4546. doi: 10.3390/ijerph18094546.
The objective of this study was to analyze the acute effect of hyperoxia during the maximal treadmill test (MTT) of runners. Participants included 10 female street runners who performed the MTT under two different conditions: hyperoxia (HYPX), inhaling oxygen (60% O) every 3 min; and normoxia (NORM), without additional oxygen inhalation. Both groups performed the MTT with increases in the slope of the run every 3 min until voluntary exhaustion. The variables of lactate concentration, the onset of blood lactate accumulation (OBLA), peripheral oxygen saturation (SpO), heart rate (HR), and Borg scale were evaluated. It was verified after the comparison (HYPX vs. NORM) that stage 3 ( = 0.012, Cohen's d = 1.76) and stage 4 ( < 0.001; Cohen's d = 5.69) showed a reduction in lactate under the HYPX condition. OBLA under the HYPX condition was identified at a later stage than NORM. There were no differences in Borg scale, SpO, and HR between the different conditions. It was concluded that the HYPX condition contributed to a reduction in lactate concentration and delayed OBLA in runners.
本研究旨在分析跑步者在最大跑步机测试（MTT）中吸氧的急性效应。参与者包括 10 名女性街头跑步者，他们在两种不同条件下进行 MTT：高氧（HYPX），每 3 分钟吸入氧气（60% O）；和常氧（NORM），不额外吸氧。两组均以每 3 分钟增加跑步坡度的方式进行 MTT，直至自愿力竭。评估了乳酸浓度、血乳酸积累起始（OBLA）、外周血氧饱和度（SpO）、心率（HR）和 Borg 量表等变量。经比较（HYPX 与 NORM）后发现，第 3 阶段（ = 0.012，Cohen's d = 1.76）和第 4 阶段（ < 0.001；Cohen's d = 5.69）的乳酸水平在 HYPX 条件下降低。HYPX 条件下的 OBLA 比 NORM 出现得更晚。Borg 量表、SpO 和 HR 在不同条件之间无差异。综上所述，HYPX 条件有助于降低跑步者的乳酸浓度并延迟 OBLA。
