Document Detail


Two days of hypoxic exposure increased ventilation without affecting performance.
MedLine Citation:
PMID:  20300029     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The aim of this study was to test the short-term effects of using hypoxic rooms before a simulated running event. Thirteen subjects (29 +/- 4 years) lived in a hypoxic dormitory (1,800 m) for either 2 nights (n = 6) or 2 days + nights (n = 7) before performing a 1,500-m treadmill test. Performance, expired gases, and muscle electrical activity were recorded and compared with a control session performed 1 week before or after the altitude session (random order). Arterial blood samples were collected before and after altitude exposure. Arterial pH and hemoglobin concentration increased (p < 0.05) and PCO2 decreased (p < 0.05) upon exiting the room. However, these parameters returned (p < 0.05) to basal levels within a few hours. During exercise, mean ventilation (VE) was higher (p < 0.05) after 2 nights or days + nights of moderate altitude exposure (113.0 +/- 27.2 L.min) than in the control run (108.6 +/- 27.8 L.min), without any modification in performance (360 +/- 45 vs. 360 +/- 42 seconds, respectively) or muscle electrical activity. This elevated VE during the run after the hypoxic exposure was probably because of the subsistence effects of the hypoxic ventilatory response. However, from a practical point of view, although the use of a normobaric simulating altitude chamber exposure induced some hematological adaptations, these disappeared within a few hours and failed to provide any benefit during the subsequent 1,500-m run.
Authors:
Sebastien Racinais; Gregoire P Millet; Chikei Li; Bronwen Masters; Justin Grantham
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Publication Detail:
Type:  Journal Article; Randomized Controlled Trial    
Journal Detail:
Title:  Journal of strength and conditioning research / National Strength & Conditioning Association     Volume:  24     ISSN:  1533-4287     ISO Abbreviation:  J Strength Cond Res     Publication Date:  2010 Apr 
Date Detail:
Created Date:  2010-04-08     Completed Date:  2010-07-21     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9415084     Medline TA:  J Strength Cond Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  985-91     Citation Subset:  IM    
Affiliation:
Research and Education Center, ASPETAR, Qatar Orthopedic and Sports Medicine Hospital, Doha, Qatar. contact@sebastienracinais.com
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MeSH Terms
Descriptor/Qualifier:
Adaptation, Physiological
Adult
Analysis of Variance
Anoxia / physiopathology*
Anthropometry
Athletic Performance / physiology*
Atmospheric Pressure
Blood Gas Analysis
Carbon Dioxide / blood
Exercise Test / methods*
Female
Heart Rate / physiology
Humans
Lactates / metabolism*
Male
Oximetry / methods
Oxygen Consumption / physiology*
Probability
Reference Values
Respiratory Mechanics
Risk Factors
Running / physiology*
Time Factors
Vital Capacity
Chemical
Reg. No./Substance:
0/Lactates; 124-38-9/Carbon Dioxide

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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