Skip to Main content Skip to Navigation
Journal articles

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

Abstract : The present study examined whether dynamic cerebral autoregulation and blood–brain barrier function would become compromised as a result of exercise-induced oxidative–nitrosative stress. Eight healthy men were examined at rest and 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.
Complete list of metadatas

https://hal-amu.archives-ouvertes.fr/hal-01142266
Contributor : Marcel Culcasi <>
Submitted on : Tuesday, April 14, 2015 - 7:37:15 PM
Last modification on : Tuesday, October 6, 2020 - 3:08:51 AM

Links full text

Identifiers

Collections

Citation

Damian M. Bailey, Kevin A. Evans, Jane Mceneny, Ian S. Young, David A. Hullin, et al.. Exercise-induced oxidative–nitrosative stress is associated with impaired dynamic cerebral auto regulation and blood–brain barrier leakage. Experimental Physiology, Wiley-Blackwell, 2011, 96, pp.1196. ⟨10.1113/expphysiol.2011.060178⟩. ⟨hal-01142266⟩

Share

Metrics

Record views

149