Discrepancy between cardiorespiratory system and skeletal muscle in elite cyclists after hypoxic training.
Discrepancy between cardiorespiratory system and skeletal muscle in elite cyclists after hypoxic training.
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缺氧训练后，心肺系统和骨骼肌之间的差异。
DOI：
10.1186/1476-5918-2-4
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发表时间：
2003-08-22
期刊：
影响因子：
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通讯作者：
Stray-Gundersen, James
中科院分区：
文献类型：
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作者：
Kime, Ryotaro;Karlsen, Trine;Nioka, Shoko;Lech, Gwen;Madsen , ORjan;Saterdal, Rolf;Im, Joohee;Chance, Britton;Stray-Gundersen, James
本研究旨在探讨低氧训练对耐力运动员心肺系统及骨骼肌的影响。8名少年国家级自行车运动员被分为两组，A组在常氧条件下（21%O2）训练，每周3天，每天2小时，连续训练3周; B组在低氧条件下（15%O2）训练。在每个初始训练条件下训练3周后，在常规野外条件下进行5周的自我训练，然后A组从NT转换为HT，B组从HT转换为NT。受试者在每个训练期之前和之后在海平面进行测试。在自行车运动试验中测定O2摄取量（O2）、血液样本和肌肉脱氧。每次训练前后最大负荷、动脉氧含量、乳酸阈氧含量和最大氧含量均无明显变化。相反，股外侧肌在次极量运动期间的脱氧变化在HT时显著高于NT（p < 0.01）。此外，HT后氧合恢复的一半时间（13.2 ± 2.6秒）显著快于NT（18.8 ± 2.7秒）（p < 0.001）。对于精英竞技自行车运动员来说，三周的HT可能不会在海平面上带来额外的表现益处，尽管HT可能会在肌肉组织水平上引起一些生理适应。
The purpose of this study was to determine the effects of hypoxic training on the cardiorespiratory system and skeletal muscle among well-trained endurance athletes in a randomized cross-over design. Eight junior national level competitive cyclists were separated into two groups; Group A trained under normoxic condition (21% O2) for 2 hours/day, 3 days/week for 3 weeks while Group B used the same training protocol under hypoxic condition (15% O2). After 3 weeks of each initial training condition, five weeks of self-training under usual field conditions intervened before the training condition was switched from NT to HT in Group A, from HT to NT in Group B. The subjects were tested at sea level before and after each training period. O2 uptake (O2), blood samples, and muscle deoxygenation were measured during bicycle exercise test. No changes in maximal workload, arterial O2 content, O2 at lactate threshold and O2max were observed before or after each training period. In contrast, deoxygenation change during submaximal exercise in the vastus lateralis was significantly higher at HT than NT (p < 0.01). In addition, half time of oxygenation recovery was significantly faster after HT (13.2 ± 2.6 sec) than NT (18.8 ± 2.7 sec) (p < 0.001). Three weeks of HT may not give an additional performance benefit at sea level for elite competitive cyclists, even though HT may induce some physiological adaptations on muscle tissue level.