| The effect of hypoxia on performance during 30 s or 45 s of supramaximal exercise. | |
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MedLine Citation:
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PMID: 2335174 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The purpose of this study was to evaluate the effect of hypoxia (10.8 +/- 0.6% oxygen) on performance of 30 s and 45 s of supramaximal dynamic exercise. Twelve males were randomly allocated to perform either a 30 s or 45 s Wingate test (WT) on two occasions (hypoxia and room air) with a minimum of 1 week between tests. After a 5-min warm-up at 120 W subjects breathed the appropriate gas mixture from a wet spirometer during a 5-min rest period. Resting blood oxygen saturation was monitored with an ear oximeter and averaged 97.8 +/- 1.5% and 83.2 +/- 1.9% for the air (normoxic) and hypoxic conditions, respectively, immediately prior to the WT. Following all WT trials, subjects breathed room air for a 10-min passive recovery period. Muscle biopsies from the vastus lateralis were taken prior to and immediately following WT. Arterialized blood samples, for lactate and blood gases, were taken before and after both the warm-up and the performance of WT, and throughout the recovery period. Open-circuit spirometry was used to calculate the total oxygen consumption (VO2), carbon dioxide production and expired ventilation during WT. Hypoxia did not impair the performance of the 30-s or 45-s WT. VO2 was reduced during the 45-s hypoxic WT (1.71 +/- 0.21 l) compared with the normoxic trial (2.16 +/- 0.26 l), but there was no change during the 30-s test (1.22 +/- 0.11 vs 1.04 +/- 0.17 l for the normoxic and hypoxic conditions, respectively).(ABSTRACT TRUNCATED AT 250 WORDS) |
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Authors:
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T M McLellan; M F Kavanagh; I Jacobs |
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Publication Detail:
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Type: Clinical Trial; Journal Article; Randomized Controlled Trial |
Journal Detail:
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Title: European journal of applied physiology and occupational physiology Volume: 60 ISSN: 0301-5548 ISO Abbreviation: Eur J Appl Physiol Occup Physiol Publication Date: 1990 |
Date Detail:
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Created Date: 1990-06-13 Completed Date: 1990-06-13 Revised Date: 2004-11-17 |
Medline Journal Info:
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Nlm Unique ID: 0410266 Medline TA: Eur J Appl Physiol Occup Physiol Country: GERMANY, WEST |
Other Details:
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Languages: eng Pagination: 155-61 Citation Subset: IM; S |
Affiliation:
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Biosciences Division, Defence and Civil Institute of Environmental Medicine, Downsview, Ontario, Canada. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Anoxia / metabolism, physiopathology* Exercise* Humans Hydrogen-Ion Concentration Lactates / blood, metabolism Muscles / metabolism, physiopathology* Osmolar Concentration Oxygen / blood Phosphates / metabolism Physical Endurance* Spirometry Time Factors |
| Chemical | |
Reg. No./Substance:
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0/Lactates; 0/Phosphates; 7782-44-7/Oxygen |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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