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Discrepancy between cardiorespiratory system and skeletal muscle in elite cyclists after hypoxic training

BACKGROUND: 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. METHODS: Eight junior national level competitive cyclists were separated into two groups...

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Autores principales: Kime, Ryotaro, Karlsen, Trine, Nioka, Shoko, Lech, Gwen, Madsen, Ørjan, Sæterdal, Rolf, Im, Joohee, Chance, Britton, Stray-Gundersen, James
Formato: Texto
Lenguaje:English
Publicado: BioMed Central 2003
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC212707/
https://www.ncbi.nlm.nih.gov/pubmed/14552659
http://dx.doi.org/10.1186/1476-5918-2-4
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author Kime, Ryotaro
Karlsen, Trine
Nioka, Shoko
Lech, Gwen
Madsen, Ørjan
Sæterdal, Rolf
Im, Joohee
Chance, Britton
Stray-Gundersen, James
author_facet Kime, Ryotaro
Karlsen, Trine
Nioka, Shoko
Lech, Gwen
Madsen, Ørjan
Sæterdal, Rolf
Im, Joohee
Chance, Britton
Stray-Gundersen, James
author_sort Kime, Ryotaro
collection PubMed
description BACKGROUND: 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. METHODS: Eight junior national level competitive cyclists were separated into two groups; Group A trained under normoxic condition (21% O(2)) for 2 hours/day, 3 days/week for 3 weeks while Group B used the same training protocol under hypoxic condition (15% O(2)). 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. O(2 )uptake ([Image: see text] O(2)), blood samples, and muscle deoxygenation were measured during bicycle exercise test. RESULTS AND DISCUSSION: No changes in maximal workload, arterial O(2 )content, [Image: see text] O(2 )at lactate threshold and [Image: see text] O(2max )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). CONCLUSIONS: 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.
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spelling pubmed-2127072003-10-14 Discrepancy between cardiorespiratory system and skeletal muscle in elite cyclists after hypoxic training Kime, Ryotaro Karlsen, Trine Nioka, Shoko Lech, Gwen Madsen, Ørjan Sæterdal, Rolf Im, Joohee Chance, Britton Stray-Gundersen, James Dyn Med Research BACKGROUND: 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. METHODS: Eight junior national level competitive cyclists were separated into two groups; Group A trained under normoxic condition (21% O(2)) for 2 hours/day, 3 days/week for 3 weeks while Group B used the same training protocol under hypoxic condition (15% O(2)). 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. O(2 )uptake ([Image: see text] O(2)), blood samples, and muscle deoxygenation were measured during bicycle exercise test. RESULTS AND DISCUSSION: No changes in maximal workload, arterial O(2 )content, [Image: see text] O(2 )at lactate threshold and [Image: see text] O(2max )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). CONCLUSIONS: 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. BioMed Central 2003-08-22 /pmc/articles/PMC212707/ /pubmed/14552659 http://dx.doi.org/10.1186/1476-5918-2-4 Text en Copyright © 2003 Kime et al; licensee BioMed Central Ltd. This is an Open Access article: verbatim copying and redistribution of this article are permitted in all media for any purpose, provided this notice is preserved along with the article's original URL.
spellingShingle Research
Kime, Ryotaro
Karlsen, Trine
Nioka, Shoko
Lech, Gwen
Madsen, Ørjan
Sæterdal, Rolf
Im, Joohee
Chance, Britton
Stray-Gundersen, James
Discrepancy between cardiorespiratory system and skeletal muscle in elite cyclists after hypoxic training
title Discrepancy between cardiorespiratory system and skeletal muscle in elite cyclists after hypoxic training
title_full Discrepancy between cardiorespiratory system and skeletal muscle in elite cyclists after hypoxic training
title_fullStr Discrepancy between cardiorespiratory system and skeletal muscle in elite cyclists after hypoxic training
title_full_unstemmed Discrepancy between cardiorespiratory system and skeletal muscle in elite cyclists after hypoxic training
title_short Discrepancy between cardiorespiratory system and skeletal muscle in elite cyclists after hypoxic training
title_sort discrepancy between cardiorespiratory system and skeletal muscle in elite cyclists after hypoxic training
topic Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC212707/
https://www.ncbi.nlm.nih.gov/pubmed/14552659
http://dx.doi.org/10.1186/1476-5918-2-4
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