Faculty of Kinesiology & Physical Education, University of Toronto, Toronto, ON M5S 1A4, Canada.
Canadian Sport Institute of Ontario, Toronto, ON M1C 0C7, Canada.
Int J Environ Res Public Health. 2022 Feb 24;19(5):2607. doi: 10.3390/ijerph19052607.
the purpose of this study was to examine acute physiological responses to and the performance effects of two sprint training protocols in normobaric hypoxic conditions.
Healthy competitive female ( = 2) and male ( = 5) kayakers (19 ± 2.1 years) performed four sprint training sessions on a kayak ergometer over a period of two weeks. Participants performed five sets of 12 × 5 s sprints or 3 × 20 s sprints in both normobaric normoxic (NOR, FO = 20.9%) or normobaric hypoxic (HYP, FO = 13.6%) conditions. The peak power output (PPO), rate of perceived exertion (RPE), and heart rate (HR) of each participant were monitored continuously. Their blood lactate concentrations ([BLa]), in addition to their blood gas (mixed-venous partial pressure (p) of carbon dioxide (pCO), O (pO), and oxygen saturations (sO)) were collected before and after exercise.
A significantly greater RPE, HR, and [BLa] response and a significant decrease in pCO, pO, and sO were observed in HYP conditions versus NOR ones, independent of the type of training session. The PPO of participants did not differ between sessions. Their RPE in HYP12 × 5 was greater compared to all other sessions.
The HYP conditions elicited significantly greater physiological strain compared to NOR conditions and this was similar in both training sessions. Our results suggest that either sprint training protocol in HYP conditions may induce more positive training adaptations compared to sprint training in NOR conditions.
本研究旨在探讨两种在常压低氧条件下的冲刺训练方案对急性生理反应和运动表现的影响。
健康的竞技女性（n=2）和男性（n=5）划艇运动员（19±2.1 岁）在两周内使用划艇测功计进行了四项冲刺训练。参与者在常压低氧（HYP，FO=13.6%）和常压低氧（NOR，FO=20.9%）条件下分别进行了五组 12×5s 冲刺或 3×20s 冲刺。持续监测每位参与者的最大功率输出（PPO）、感觉用力程度（RPE）和心率（HR）。运动前后采集他们的血乳酸浓度（[BLa]）和血气（混合静脉二氧化碳分压（pCO）、O（pO）和氧饱和度（sO））。
与 NOR 条件相比，HYP 条件下的 RPE、HR 和 [BLa] 反应显著增加，pCO、pO 和 sO 显著降低，与训练方案类型无关。参与者的 PPO 在不同训练方案之间没有差异。HYP12×5 的 RPE 大于其他所有训练方案。
与 NOR 条件相比，HYP 条件引起的生理应激明显更大，两种训练方案均如此。我们的结果表明，与 NOR 条件下的冲刺训练相比，HYP 条件下的任何一种冲刺训练方案都可能引起更积极的训练适应。
