{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,13]],"date-time":"2026-04-13T07:16:12Z","timestamp":1776064572339,"version":"3.50.1"},"reference-count":46,"publisher":"American Physiological Society","issue":"4","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["American Journal of Physiology-Heart and Circulatory Physiology"],"published-print":{"date-parts":[[2020,4,1]]},"abstract":"<jats:p> South Asians living in the United Kingdom have a 1.5-fold greater risk of ischemic stroke than the general population. Impaired cerebrovascular carbon dioxide (CO<jats:sub>2<\/jats:sub>) reactivity is an independent predictor of ischemic stroke and cardiovascular mortality. We sought to test the hypothesis that cerebrovascular CO<jats:sub>2<\/jats:sub> reactivity is reduced in South Asians. Middle cerebral artery blood velocity (MCA V<jats:sub>m<\/jats:sub>) was measured at rest and during stepwise changes in end-tidal partial pressure of CO<jats:sub>2<\/jats:sub> ([Formula: see text]) in South Asian ( n = 16) and Caucasian European ( n = 18) men who were young (~20 yr), healthy, and living in the United Kingdom. Incremental hypercapnia was delivered via the open-circuit steady-state method, with stages of 4 and 7% CO<jats:sub>2<\/jats:sub> (\u224821% oxygen, nitrogen balanced). Cerebrovascular CO<jats:sub>2<\/jats:sub> reactivity was calculated as the change in MCA V<jats:sub>m<\/jats:sub> relative to the change in [Formula: see text]. MCA V<jats:sub>m<\/jats:sub> was not different in South Asians [59 (9) cm\/s, mean (standard deviation)] and Caucasian Europeans [61 (12) cm\/s; P &gt; 0.05]. Similarly, cerebrovascular CO<jats:sub>2<\/jats:sub> reactivity was not different between the groups [South Asian 2.53 (0.76) vs. Caucasian European 2.61 (0.81) cm\u00b7s<jats:sup>\u22121<\/jats:sup>\u00b7mmHg<jats:sup>\u22121<\/jats:sup>; P &gt; 0.05]. Brachial artery flow-mediated dilation was lower in South Asians [5.48 (2.94)%] compared with Caucasian Europeans [7.41 (2.28)%; P &lt; 0.05]; however, when corrected for shear rate no between-group differences in flow-mediated dilation were observed ( P &gt; 0.05). Flow-mediated dilation was not correlated with cerebrovascular CO<jats:sub>2<\/jats:sub> reactivity measures. In summary, cerebrovascular CO<jats:sub>2<\/jats:sub> reactivity and flow-mediated dilation corrected for shear rate are preserved in young healthy South Asian men living in the United Kingdom. <\/jats:p><jats:p> NEW &amp; NOTEWORTHY Previous reports have identified an increased risk of ischemic stroke and peripheral endothelial dysfunction in South Asians compared with Caucasian Europeans. The main finding of this study is that cerebrovascular carbon dioxide reactivity (an independent predictor of ischemic stroke) is not different in healthy young South Asian and Caucasian European men. <\/jats:p>","DOI":"10.1152\/ajpheart.00641.2019","type":"journal-article","created":{"date-parts":[[2020,2,21]],"date-time":"2020-02-21T17:43:08Z","timestamp":1582306988000},"page":"H756-H763","source":"Crossref","is-referenced-by-count":7,"title":["Cerebrovascular carbon dioxide reactivity and flow-mediated dilation in young healthy South Asian and Caucasian European men"],"prefix":"10.1152","volume":"318","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0670-8339","authenticated-orcid":false,"given":"Rehan T.","family":"Junejo","sequence":"first","affiliation":[{"name":"School of Sport, Exercise and Rehabilitation Sciences, College of Life and Environmental Sciences, University of Birmingham, Birmingham, United Kingdom"},{"name":"Liverpool Centre for Cardiovascular Science, Institute 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