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In vitro electron paramagnetic resonance characterization of free radicals: relevance to exercise-induced lipid peroxidation and implications of ascorbate prophylaxis

Biomedical Sciences Research Institute Computer Science Research Institute Environmental Sciences Research Institute Nanotechnology & Advanced Materials Research Institute

Davison, Gareth, Ashton, Tony, Davies, Bruce and Bailey, Damian (2008) In vitro electron paramagnetic resonance characterization of free radicals: relevance to exercise-induced lipid peroxidation and implications of ascorbate prophylaxis. Free Radical Research, 42 . pp. 379-386. [Journal article]

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DOI: 10.1080/10715760801976618

Abstract

This study tested the hypothesis that exercise-induced oxidative stress is caused by free radical-mediated damage topolyunsaturated fatty acids (PUFA) which can be prevented following ascorbate prophylaxis. Hyperfine coupling constants(HCC) of a-phenyl-tert-butylnitrone (PBN)-adducts were measured via room temperature electron paramagnetic resonance(EPR) spectroscopy in the venous blood of 12 subjects at rest and following maximal exercise during a randomized doubleblindplacebo-controlled trial and compared to those observed following room-air incubation (2 h at 378C) of L aphosphatidycholine,linoleic acid, a-linolenic acid and arachidonic acid. All adducts exhibited similar HCC [aN 13.6 Gauss(G) and abH 1.8 G] with the exception of L-a-phosphatidycholine [aN113.4 G, abH11.6 G (37%) and aN214.9 G,abH20.3 G (63%)] consistent with the trapping of lipid-derived alkoxyl and oleate radicals, respectively. Ascorbate pretreatmentablated radical formation in both systems. These findings identify circulating PUFA as a potential source ofsecondary radicals that are capable of initiating oxidative stress in the exercising human.

Item Type:Journal article
Faculties and Schools:Faculty of Life and Health Sciences
Faculty of Life and Health Sciences > Ulster Sports Academy
Research Institutes and Groups:Sport and Exercise Sciences Research Institute
Sport and Exercise Sciences Research Institute > Centre for Physical Activity and Health
ID Code:5752
Deposited By:Professor Gareth Davison
Deposited On:04 Feb 2010 15:38
Last Modified:12 Feb 2014 15:10

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