Document Detail

The effects of short-term antioxidant supplementation on oxidative stress and flight performance in adult budgerigars Melopsittacus undulatus.
MedLine Citation:
PMID:  18723545     Owner:  NLM     Status:  MEDLINE    
Antioxidants are known to play an important role in quenching reactive oxygen species (ROS), thus ameliorating oxidative stress. Since increased metabolism associated with exercise can increase oxidative stress, dietary antioxidants may be a limiting factor in determining aspects of physical performance. Here we tested whether oxidative stress associated with flight exercise of captive adult budgerigars, Melopsittacus undulatus differed after they received a diet containing either enhanced (EQ) or reduced levels (RQ) of a nutritional supplement (Nutrivit) rich in antioxidants for 4 weeks. We also assessed differences in take-off escape time, a potential fitness-determining physiological capability. Oxidative stress was measured in two ways: comet assay to measure DNA damage; and analysis of malondialdehyde (MDA), a by-product of lipid peroxidation. Flight exercise appeared to increase oxidative stress. Moreover, birds had a higher percentage of intact DNA (fewer alkali labile sites) in one comet measure and lower levels of MDA after an EQ diet than after an RQ diet. We found no difference in flight performance between the two diets. Our results suggested that birds exerted maximum effort in escape flights, regardless of diet. However, this was at a cost of increased oxidative stress post-flight when on a reduced quality diet, but not when on an enhanced, antioxidant-rich diet. We suggest that dietary antioxidants may prove important in reducing exercise-related costs through multiple physiological pathways. Further work is necessary to fully understand the effects of antioxidants and oxidative stress on exercise performance in the longer term.
S D Larcombe; C A Tregaskes; J S Coffey; A E Stevenson; L Alexander; K E Arnold
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Journal of experimental biology     Volume:  211     ISSN:  0022-0949     ISO Abbreviation:  J. Exp. Biol.     Publication Date:  2008 Sep 
Date Detail:
Created Date:  2008-08-25     Completed Date:  2008-11-17     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0243705     Medline TA:  J Exp Biol     Country:  England    
Other Details:
Languages:  eng     Pagination:  2859-64     Citation Subset:  IM    
Division of Environmental and Evolutionary Biology, Institute of Biomedical and Life Sciences, University of Glasgow, Glasgow, UK.
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MeSH Terms
Antioxidants / pharmacology*
Comet Assay
Dietary Supplements
Flight, Animal / physiology*
Linear Models
Malondialdehyde / blood
Melopsittacus / physiology*
Oxidative Stress / drug effects,  physiology*
Time Factors
Grant Support
//Biotechnology and Biological Sciences Research Council
Reg. No./Substance:
0/Antioxidants; 542-78-9/Malondialdehyde

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