Document Detail


Normoxic ventilatory response in lowlander and Sherpa elite climbers.
MedLine Citation:
PMID:  9776551     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The differences in ventilatory response to exercise of some highland ethnic communities is a controversial issue. We have evaluated the differences in ventilatory response to exercise at sea level between two groups of elite climbers, four Himalayan Sherpas (S) and four Caucasian lowlanders (C), after descent from extreme altitude. All of them performed a progressive-intensity exercise test on a treadmill under normoxic conditions. Pulmonary gas exchange was obtained until exhaustion by means of an automatic gas-analyzer system. Significant differences in expired ventilation and carbon dioxide production were found between the two groups, the VE x VO2(-1) being lower in the S at rest (41.9 +/- 5) in comparison with C (48.7 +/- 9) (P < 0.05), higher at medium loads of the test (S = 28.2 +/- 4 vs. C = 25.7 +/- 2; P < 0.05) and reaching similar values at higher loads (S = 34.5 + 2 vs. C = 35.6 +/- 4; NS). We conclude that the special ventilatory response observed in these highlanders could explain their adaptation to altitude, allowing higher oxygen blood saturation at medium working loads and reducing the risk of neurological injury caused by a high ventilatory response when exercising at high intensity effort under extreme altitude environment.
Authors:
G Rodas; C Javierre; E Garrido; R Segura; J L Ventura
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Respiration physiology     Volume:  113     ISSN:  0034-5687     ISO Abbreviation:  Respir Physiol     Publication Date:  1998 Jul 
Date Detail:
Created Date:  1998-12-23     Completed Date:  1998-12-23     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0047142     Medline TA:  Respir Physiol     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  57-64     Citation Subset:  IM; S    
Affiliation:
CEARE, Center for High Performance and Exercise Physiology, Secretaria General de l'Esport, Barcelona, Spain.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Acclimatization / physiology*
Adult
Altitude*
Carbon Dioxide
Exercise
Humans
Male
Mountaineering*
Oxygen
Pulmonary Gas Exchange / physiology
Reference Values
Respiration*
Chemical
Reg. No./Substance:
124-38-9/Carbon Dioxide; 7782-44-7/Oxygen

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


Previous Document:  Pulmonary blood flow measured by inspiratory inert gas concentration forcing oscillations.
Next Document:  Extent of expiratory flow limitation influences the increase in maximal exercise ventilation in hypo...