Document Detail


Oxidative stress response in normal and antioxidant supplemented rats to a downhill run: changes in blood and skeletal muscles.
MedLine Citation:
PMID:  16485519     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The purpose of this study was to determine if changes in oxidative stress biomarkers in blood and skeletal muscles are similar in normal and antioxidant supplemented rats after a downhill run. Sixty-six male Sprague-Dawley rats were pretreated with a normal rat diet or diet + antioxidants (2,000 mg vitamin C + 1,000 IU vitamin E/kg diet) for 2 weeks. Exercised rats ran 90 min on a rodent treadmill at a speed of 16 m/min at -16 degrees grade. Rats were sacrificed either at rest, immediately, 2 hrs, or 48 hrs postexercise. Malondialdehyde (MDA) and protein carbonyl (PC) concentrations and glutathione status in blood, vastus lateralis (white fast-twitch), vastus intermedius (red fast-twitch), and soleus (slow-twitch) muscles were determined. A significant increase from rest in PC occurred in plasma, vastus intermedius and soleus muscle 2 hrs after the downhill run (p < 0.05), with no changes observed at any other times postexercise. Antioxidant supplementation significantly decreased PC concentrations in both vastus intermedius and soleus muscles at all times combined (p < 0.05). MDA and glutathione status in blood and muscles were unaffected by either the downhill run or antioxidant treatment. For PC and MDA, the concentrations were lower in blood as compared to skeletal muscle, with the opposite finding for oxidized glutathione; however, the pattern of response postexercise was similar. These data indicate that (a) PC, but not MDA or oxidized glutathione, is elevated transiently following downhill running in male rats; (b) the elevation in PC postexercise occurs in plasma, vastus intermedius, and soleus muscles; (c) antioxidant therapy can attenuate PC in vastus intermedius, and soleus muscles; and (d) while the concentrations of oxidative stress biomarkers differ between blood and the various skeletal muscles, the pattern of response postexercise is similar.
Authors:
Tongjian You; Allan H Goldfarb; Richard J Bloomer; Linh Nguyen; Xin Sha; Michael J McKenzie
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Canadian journal of applied physiology = Revue canadienne de physiologie appliquée     Volume:  30     ISSN:  1066-7814     ISO Abbreviation:  Can J Appl Physiol     Publication Date:  2005 Dec 
Date Detail:
Created Date:  2006-02-20     Completed Date:  2006-03-10     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9306274     Medline TA:  Can J Appl Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  677-89     Citation Subset:  IM    
Affiliation:
Gerontology and Geriatric Medicine, Wake Forest U School of Medicine, Winston-Salem, NC 27157, USA.
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MeSH Terms
Descriptor/Qualifier:
Animals
Antioxidants / administration & dosage*
Ascorbic Acid / administration & dosage*
Dietary Supplements*
Glutathione / blood,  metabolism*
Hindlimb
Male
Malondialdehyde / blood,  metabolism*
Muscle, Skeletal / metabolism*
Oxidative Stress / physiology*
Physical Conditioning, Animal*
Protein Carbonylation / physiology
Rats
Rats, Sprague-Dawley
Vitamin E / administration & dosage*
Chemical
Reg. No./Substance:
0/Antioxidants; 1406-18-4/Vitamin E; 50-81-7/Ascorbic Acid; 542-78-9/Malondialdehyde; 70-18-8/Glutathione

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


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