| Impairment of 3,000m Run Time at Altitude Is Influenced By Arterial Oxyhemoglibin Saturation. | |
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MedLine Citation:
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PMID: 21311361 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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ABSTRACT: The decline in maximal oxygen uptake (ΔVO2max) with acute exposure to moderate altitude is dependent on the ability to maintain arterial oxyhemoglobin saturation (SaO2). PURPOSE:: This study examined if factors related to ΔVO2max at altitude are also related to the decline in race performance of elite athletes at altitude. METHODS:: Twenty-seven elite distance runners (18 M, 9 F, VO2max = 71.8 ± 7.2 ml·kg·min) performed treadmill exercise at a constant speed which simulated their 3,000m race pace, both in normoxia and 16.3% O2 (~2100m). Separate 3,000m time trials were completed at sea level (18h prior to altitude exposure) and at 2,100m (48h after arrival at altitude). Statistical significance was set at 2100m). Separate 3,000m time trials were completed at sea level (18h prior to altitude exposure) and at 2,100m (48h after arrival at altitude). Statistical significance was set at p≤0.05. RESULTS:: Group 3,000m performance was significantly slower at altitude versus sea level (48.5 ± 12.7s), and the declines were significant in men (48.4 ± 14.6s) and women (48.6 ± 8.9s). Athletes grouped by low SaO2during race pace in normoxia (SaO2< 91%, n=7) had a significantly larger ΔVO2 in hypoxia (-9.2±2.1 ml·kg·min) and Δ3,000m time at altitude (54.0 ± 13.7s) compared to athletes with high SaO2 in normoxia (SaO2> 93%, n=7, ΔVO2 = -3.5 ± 2.0 ml·kg·min, Δ3,000m time = 38.9 ±9.7s). For all athletes, SaO2 during normoxic race pace running was significantly correlated with both ΔVO2(r = -0.68) and Δ3,000m time (r = -0.38). CONCLUSION:: These results indicate that the degree of arterial oxyhemoglobin desaturation, already known to influence ΔVO2max at altitude, also contributes to the magnitude of decline in race performance at altitude. |
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Authors:
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Robert F Chapman; Joel M Stager; David A Tanner; James Stray-Gundersen; Benjamin D Levine |
Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-2-8 |
Journal Detail:
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Title: Medicine and science in sports and exercise Volume: - ISSN: 1530-0315 ISO Abbreviation: - Publication Date: 2011 Feb |
Date Detail:
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Created Date: 2011-2-11 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8005433 Medline TA: Med Sci Sports Exerc Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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1Human Performance Laboratory, Department of Kinesiology, Indiana University; 2Institute for Exercise and Environmental Medicine, Presbyterian Hospital of Dallas, The University of Texas Southwestern Medical Center. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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