Muscle Oxygenation during Repeated Cycling Sprints in a Combined Hot and Hypoxic Condition
Muscle Oxygenation during Repeated Cycling Sprints in a Combined Hot and Hypoxic Condition
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在高温和缺氧条件下重复循环冲刺期间的肌肉氧合
DOI：
10.1055/a-1495-5612
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发表时间：
2022
影响因子：
2.5
通讯作者：
Goto Kazushige
中科院分区：
文献类型：
--
作者：
Yamaguchi Keiichi;Kasai Nobukazu;Hayashi Nanako;Yatsutani Haruka;Girard Olivier;Goto Kazushige
本研究的目的是检查一个组合的热， 低氧环境对重复训练中肌肉氧合和运动能力影响 骑自行车冲刺在单盲、平衡、交叉研究设计中， 10名男运动员进行3组3 × 10-s的最大蹬踏 在四种不同的短跑之间穿插40秒的恢复， 环境.每种条件由对照（CON; 20°C， 20.9%FiO2）、常压缺氧（HYP; 20°C， 14.5% FiO 2），热（HOT; 35°C，20.9% FiO 2），以及组合的热和常压缺氧（HH; 35°C， 14.5% FiO2）。功率输出和股外侧肌 测量氧合。HOT组的峰值功率输出显著高于 (892±27 W）和HH（887±24 W） (866±25 W）和HYP（859±25 W） set（p<0.05）。恢复期总血红蛋白的增加 组织饱和度的变化在HH组大于HYP组（p<0.05）， HYP组指数小于CON组和HOT组（p<0.05）。这些发现 表明在反复的自行车冲刺中， 肌肉代谢和功率输出呈现出不同的特点 与单独的温度或海拔压力源相比。
The aim of the present study was to examine the effects of a combined hot and hypoxic environment on muscle oxygenation and performance during repeated cycling sprints. In a single-blind, counterbalanced, cross-over research design, 10 male athletes performed three sets of 3 × 10-s maximal pedaling interspersed with 40-s recovery between sprints under four different environments. Each condition consisted of a control (CON; 20°C, 20.9% FiO2), normobaric hypoxia (HYP; 20°C, 14.5% FiO2), hot (HOT; 35°C, 20.9% FiO2), and combined hot and normobaric hypoxia (HH; 35°C, 14.5% FiO2). Power output andvastus lateralismuscle oxygenation were measured. Peak power output was significantly higher in HOT (892±27 W) and HH (887±24 W) than in CON (866±25 W) and HYP (859±25 W) during the first set (p<0.05). The increase in total hemoglobin during recovery periods was larger in HH than in HYP (p<0.05), while change in tissue saturation index was smaller in HYP than in CON and HOT (p<0.05). The findings suggest that the combination of hot and hypoxia during repeated cycling sprints presented different characteristics for muscle metabolism and power output compared to temperature or altitude stressor alone.