Contribution of prostaglandins to exercise hyperaemia: workload, ethnicity and sex matter!

Research output: Contribution to journalArticle

Authors

Colleges, School and Institutes

Abstract

The contribution of prostaglandins (PGs) to exercise hyperaemia is controversial. In this review, we argue this is partly explained by differences in exercise intensity between studies. The effects of cyclooxygenase (COX) inhibition and PG assays indicate that PGs contribute more at moderate to heavy than at light workloads and are mainly released by low tissue O2 . But, the release and actions of PGs also depend on other O2 -dependent dilators including ATP, adenosine and NO. K+ may inhibit the action of PGs and other mediators by causing hyperpolarization, but contributes to the hyperaemia. Thus, at lighter loads, the influence of PGs may be blunted by K+ , while COX inhibition leads to compensatory increases in other O2 -dependent dilators. In addition, we show that other sources of variability are sex and ethnicity. Our findings indicate that exercise hyperaemia following rhythmic contractions at 60% maximum voluntary contraction, is smaller in young black African (BA) men and women than in their white European (WE) counterparts, but larger in men than in women of both ethnicities. We propose the larger absolute force in men causes greater vascular occlusion and accumulation of dilators, while blunted hyperaemia in BAs may reflect lower oxidative capacity and O2 requirement. Nevertheless, COX inhibition attenuated peak hyperaemia by ∼30% in WE, BA men and WE women, indicating PGs make a substantial contribution in all three groups. There was no effect in BA women. Lack of PG involvement may provide early evidence of endothelial dysfunction, consistent in BA women with their greater risk of cardiovascular disease.

Details

Original languageEnglish
Pages (from-to)4887-4900
Number of pages14
JournalThe Journal of Physiology
Volume597
Issue number19
Early online date16 Sep 2019
Publication statusPublished - 1 Oct 2019
EventEurophysiology 2018 symposium: ‘Estrogen, exercise and vascular function’ - The QEII Centre, London, United Kingdom
Duration: 14 Sep 201816 Sep 2018

Keywords

  • ethnicity, exercise, hyperaemia, prostaglandins, sex, vasodilatation

ASJC Scopus subject areas