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Exercise-induced oxidative-nitrosative stress is associated with impaired dynamic cerebral autoregulation and blood-brain barrier leakage

Bailey, Damian M., Evans, Kevin A., McEneny, Jane, Young, Ian S., Hullin, David A., James, Philip Eurig, Ogoh, Shigehiko, Ainslie, Philip N., Lucchesi, Céline, Rockenbauer, Antal, Culcasi, Marcel and Pietri, Sylvia 2011. Exercise-induced oxidative-nitrosative stress is associated with impaired dynamic cerebral autoregulation and blood-brain barrier leakage. Experimental Physiology 96 (11) , pp. 1196-1207. 10.1113/expphysiol.2011.060178

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Abstract

The present study examined whether dynamic cerebral autoregulation and blood–brain barrier functionwould becomecompromised as a result of exercise-induced oxidative–nitrosative stress. Eighthealthymenwere examined at restand after an incrementalboutof semi-recumbent cycling exercise to exhaustion. Changes in a dynamic cerebral autoregulation index were determined during recovery from continuous recordings of blood flow velocity in the middle cerebral artery (MCAv) and mean arterial pressure during transiently induced hypotension. Electron paramagnetic resonance spectroscopy and ozone-based chemiluminescence were employed for direct detection of spin-trapped free radicals and nitric oxide metabolites in venous blood. Neuron-specific enolase, S100β and 3-nitrotyrosine were determined by ELISA.While exercise did not alter MCAv, it caused a mild reduction in the autoregulation index (from 6.9±0.6 to 5.5±0.9 a.u., P <0.05) that correlated directly against the exercise-induced increase in the ascorbate radical, 5-(diethoxyphosphoryl)-5-methyl-1-pyrroline N-oxide and N-tert-butyl-α- phenylnitrone adducts, 3-nitrotyrosine and S100β (r =–0.66 to –0.76, P <0.05). In contrast, no changes in neuron-specific enolase were observed. In conclusion, our findings suggest that intense exercise has the potential to increase blood–brain barrier permeability without causing structural brain damage subsequent to a free radical-mediated impairment in dynamic cerebral autoregulation.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Medicine
Subjects: R Medicine > R Medicine (General)
Publisher: Wiley-Blackwell
ISSN: 0958-0670
Last Modified: 19 Mar 2016 22:49
URI: http://orca-mwe.cf.ac.uk/id/eprint/28396

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