Human Performance Laboratory, Department of Anatomy, Trinity College Dublin, Dublin, Ireland.
Department of Exercise Physiology, Kent State University, Kent, Ohio USA.
J Int Soc Sports Nutr. 2017 Mar 29;14:9. doi: 10.1186/s12970-017-0166-y. eCollection 2017.
Drinks with higher dissolved oxygen concentrations have in recent times gained popularity as a potential ergogenic aid, despite a lack of evidence regarding their efficacy. The aim of this study was to assess effects of ingestion of an oxygen supplement (OS) on exercise performance and post-exercise recovery in a group of trained runners.
Trained male runners ( 25, mean ± SD; age 23 ± 6 years, mass 70 ± 9 kg, BMI 21.9 ± 2.7 kg.m VOmax 64 ± 6mL.kg.min), completed a randomised double blinded, crossover study to assess the effect of ingestion of OS solution on exercise performance and recovery. Trials consisted of a 30min rest period, 5min warm-up, a 5000m treadmill time-trial, and a 30min passive recovery. Participants ingested 6x15mL of either OS or a taste matched placebo during the trials (3 during the rest phase, 1 during exercise and 2 during the recovery). Muscle tissue O saturation was measured via near infrared spectroscopy. Blood lactate concentrations were measured prior to, mid-way and directly after the finish of the 5000m time trials and every 3-min during the post-exercise recovery.
Ingestion of OS did not improve exercise performance. No significant differences were observed for muscle tissue O saturation at any time-points. However, lactate clearance was significantly improved during recovery in the OS trials. Both AUC (109 ± 32 vs. 123 ± 38 mmol.min, 0.05, d = 0.40) and lactate half-life (λ) (1127 ± 272 vs. 1223 ± 334 s, 0.05, d = 0.32) were significantly reduced.
Despite no evidence of improved exercise performance, ingestion of OS did enhance post-exercise recovery via increased lactate clearance.
近年来，高溶解氧浓度的饮料作为一种潜在的运动补剂越来越受欢迎，尽管其功效缺乏证据支持。本研究旨在评估氧气补充剂（OS）的摄入对一组训练有素的跑步者的运动表现和运动后恢复的影响。
训练有素的男性跑步者（25 名，平均值 ± 标准差；年龄 23 ± 6 岁，体重 70 ± 9kg，BMI 21.9 ± 2.7kg.m VOmax 64 ± 6mL.kg.min）完成了一项随机、双盲、交叉研究，以评估 OS 溶液摄入对运动表现和恢复的影响。试验包括 30 分钟的休息期、5 分钟的热身期、5000 米跑步机计时赛和 30 分钟的被动恢复期。参与者在试验期间摄入 6x15mL 的 OS 或口味匹配的安慰剂（3 次在休息期，1 次在运动期间，2 次在恢复期）。通过近红外光谱测量肌肉组织的氧饱和度。在 5000 米计时赛结束前、中途和直接结束后以及运动后恢复的每 3 分钟测量一次血液乳酸浓度。
OS 的摄入并没有提高运动表现。在任何时间点，肌肉组织的氧饱和度都没有显著差异。然而，在 OS 试验中，恢复期间的乳酸清除率显著提高。AUC（109 ± 32 与 123 ± 38mmol.min，0.05，d = 0.40）和乳酸半衰期（λ）（1127 ± 272 与 1223 ± 334s，0.05，d = 0.32）均显著降低。
尽管没有证据表明运动表现提高，但 OS 的摄入通过增加乳酸清除率确实促进了运动后的恢复。
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