Effects of combined hot and hypoxic conditions on muscle blood flow and muscle oxygenation during repeated cycling sprints
Effects of combined hot and hypoxic conditions on muscle blood flow and muscle oxygenation during repeated cycling sprints
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高温和缺氧条件对重复自行车冲刺期间肌肉血流和肌肉氧合的影响
DOI：
10.1007/s00421-021-04738-w
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发表时间：
2021
影响因子：
3
通讯作者：
Goto Kazushige
中科院分区：
文献类型：
--
作者：
Yamaguchi Keiichi;Sumi Daichi;Hayashi Nanako;Ota Naoki;Ienaga Koki;Goto Kazushige
目的本研究的目的是测定热、缺氧联合条件下重复冲刺运动中肌肉血流量和肌肉氧合。方法采用单盲交叉研究设计，11名运动男性在控制（CON; 23°C, 50% rH, 20.9% FiO2）、正压缺氧（HYP; 23°C, 50% rH, 14.5% FiO2）或热+正压缺氧（HH; 35°C, 50% rH, 14.5% FiO2）条件下进行3组5 × 6秒的最大冲刺，30秒的主动恢复。采用近红外光谱法测定各组后股外侧肌血流量及各组短跑时肌肉氧合情况。结果尽管三种情况下（峰值和平均功率输出，百分比减值得分）的重复冲刺表现相似，但HH与CON相比，第一组后的肌肉血流量显著增加（CON: 0.61±0.10 mL/min/100 g; HYP: 0.81±0.13 mL/min/100 g; HH: 0.99±0.16 mL/min/100 g；P< 0.05）。在运动后期，高氧组的组织饱和指数明显低于对照组（P< 0.05），而低氧组与对照组的组织饱和指数无显著差异。结论常压缺氧和热应激联合作用部分促进了运动引起的局部血流量的增加，但没有增强组织去饱和。
PurposeThe purpose of the present study was to determine muscle blood flow and muscle oxygenation during repeated-sprint exercise under combined hot and hypoxic conditions.MethodsIn a single-blind, cross-over research design, 11 active males performed three sets of 5 × 6-s maximal sprints with 30-s active recovery on a cycling ergometer under control (CON; 23 °C, 50% rH, 20.9% FiO2), normobaric hypoxic (HYP; 23 °C, 50% rH, 14.5% FiO2), or hot + normobaric hypoxic (HH; 35 °C, 50% rH, 14.5% FiO2) conditions. The vastus lateralis muscle blood flow after each set and muscle oxygenation during each sprint were evaluated using near-infrared spectroscopy methods.ResultsDespite similar repeated-sprint performance among the three conditions (peak and mean power outputs, percent decrement score), HH was associated with significantly higher muscle blood flow compared with CON after the first set (CON: 0.61 ± 0.10 mL/min/100 g; HYP: 0.81 ± 0.13 mL/min/100 g; HH: 0.99 ± 0.16 mL/min/100 g;P< 0.05). The tissue saturation index was significantly lower in HYP than in CON during the latter phase of the exercise (P< 0.05), but it did not differ between HH and CON.ConclusionThese findings suggest that a combination of normobaric hypoxia and heat stress partially facilitated the exercise-induced increase in local blood flow, but it did not enhance tissue desaturation.
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炎热和缺氧条件下耐力运动的内分泌和代谢反应
影响因子：
4
作者：
Yatsutani Haruka;Mori Hisashi;Ito Hiroto;Hayashi Nanako;Girard Olivier;Goto Kazushige
通讯作者：
Goto Kazushige
影响因子：
2.7
作者：
Kalsi KK;Chiesa ST;Trangmar SJ;Ali L;Lotlikar MD;González-Alonso J
通讯作者：
González-Alonso J
影响因子：
3.4
作者：
Brocherie, Franck;Girard, Olivier;Millet, Gregoire P.
通讯作者：
Millet, Gregoire P.
DOI：
10.1152/ajpregu.1996.271.5.r1251
发表时间：
1996-11-01
影响因子：
2.8
作者：
Febbraio, MA;Carey, MF;Hargreaves, M
通讯作者：
Hargreaves, M
影响因子：
3
作者：
Girard, Olivier;Bishop, D. J.;Racinais, S.
通讯作者：
Racinais, S.