| 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 |
Related Documents
:
|
3586109 - Altitude and wind effects on long jump performance with particular reference to the wor... 19363619 - Moderate altitude but not additional endurance training increases markers of oxidative ... 14849 - Oxygen and carbon dioxide in the regulation of respiration. 15498689 - On line gamma-ray spectrometry at open sea. 15214059 - Growth of han migrants at high altitude in central asia. 16891649 - Mini-incision for strictly retroperitoneal nephrectomy in living kidney donation vs fla... 21610009 - Self-determination and exercise stages of change: results from the diabetes aerobic and... 2494759 - Increase in ventilation caused by aminophylline in the absence of changes in ventral me... 7440279 - Effects of contraction force and frequency on postexercise hyperemia in human calf musc... |
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 |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| 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
Previous Document: Effect of a Prior Force-Velocity Test Performed with Legs on Subsequent Peak Power Output Measured w...
Next Document: Comparison of Active, Manual, and Instrumental Straight Leg Raise in Measuring Hamstring Extensibili...