Document Detail


Antioxidant and redox status after maximal aerobic exercise at high altitude in acclimatized lowlanders and native highlanders.
MedLine Citation:
PMID:  19466447     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Exercise-induced increase in oxygen consumption leads to oxidative stress. On the contrary, hypoxia triggers oxidative stress despite decreased oxygen flux. Therefore, exercise under hypoxia may aggravate oxidative damage. Highlanders are expected to have better antioxidant capacity than lowlanders as a result of adaptation to hypoxia. The present study was undertaken to investigate the effect of exercise on antioxidant system in lowlanders and highlanders at high altitudes (HA). This study was conducted on active male volunteers, randomly selected and categorized into three groups, i.e., lowlanders tested at sea level (LL-SL, n = 35), lowlanders tested at altitude of 4560 m (LL-HA, n = 35) and native highlanders tested (HAN, n = 20) at the same height. Volunteers performed maximal exercise until exhaustion. Blood samples were collected before and after exercise. Both LL-SL and HAN had shown similar VO2max, which was significantly higher than LL-HA. GSH/GSSG ratio significantly increased in LL-SL and decreased in HAN after exercise. With exercise there were a decrease in superoxide dismutase and increase in glutathione peroxidase and catalase activities in HAN. Therefore, the results have suggested that HAN are more susceptible to oxidative stress when subjected to high-intensity exercise than lowlanders. The cumulative effect of higher VO2max and longer duration of exercise in hypoxia may be the reason of higher level of oxidative insult among HAN. Comparatively better management of antioxidant system observed in lowlanders at HA may be explained by the lower VO2max and shorter duration of exercise in hypoxia.
Authors:
Sanchari Sinha; U S Ray; M Saha; S N Singh; O S Tomar
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Publication Detail:
Type:  Journal Article; Randomized Controlled Trial     Date:  2009-05-24
Journal Detail:
Title:  European journal of applied physiology     Volume:  106     ISSN:  1439-6327     ISO Abbreviation:  Eur. J. Appl. Physiol.     Publication Date:  2009 Aug 
Date Detail:
Created Date:  2009-07-30     Completed Date:  2009-10-14     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100954790     Medline TA:  Eur J Appl Physiol     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  807-14     Citation Subset:  IM    
Affiliation:
Environmental Physiology Division, Defence Institute of Physiology and Allied Sciences, Timarpur, Lucknow Road, Delhi, 110054, India.
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MeSH Terms
Descriptor/Qualifier:
Acclimatization / physiology*
Adult
Altitude*
Anaerobic Threshold / physiology*
Antioxidants / metabolism*
Exercise Tolerance / physiology*
Humans
Oxidation-Reduction
Oxygen Consumption / physiology*
Reactive Oxygen Species / blood*
Chemical
Reg. No./Substance:
0/Antioxidants; 0/Reactive Oxygen Species

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


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