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Hyperthermia does not alter the increase in cerebral perfusion during cognitive activation
Texas Hlth Presbyterian Hosp Dallas, Inst Exercise & Environm Med, Dallas, TX 75231 USA.
Umeå University, Faculty of Medicine, Department of Public Health and Clinical Medicine, Epidemiology and Global Health. Texas Hlth Presbyterian Hosp Dallas, Inst Exercise & Environm Med, Dallas, TX 75231 USA.
Texas Hlth Presbyterian Hosp Dallas, Inst Exercise & Environm Med, Dallas, TX 75231 USA.
Texas Hlth Presbyterian Hosp Dallas, Inst Exercise & Environm Med, Dallas, TX 75231 USA.
2013 (English)In: Experimental Physiology, ISSN 0958-0670, E-ISSN 1469-445X, Vol. 98, no 11, 1597-1607 p.Article in journal (Refereed) Published
Abstract [en]

This study tested the hypothesis that hyperthermia attenuates the increase in cerebral perfusion during cognitive activation. Mean middle cerebral artery blood velocity (MCAV(mean)) served as an index of cerebral perfusion, while the nBack test (a test of working memory) was the cognitive task. Hyperthermia was characterized by elevations (P < 0.001) in skin (by 5.0 +/- 0.8 degrees C) and intestinal temperatures (by 1.3 +/- 0.1 degrees C) and reductions (P < 0.020) in mean arterial pressure (by 11 +/- 10 mmHg), end-tidal CO2 tension (by 3 +/- 6 mmHg) and MCAVmean (by 10 +/- 9 cm s(-1)). Hyperthermia had no influence on nBack test performance (mean difference from normothermia to hyperthermia, -1 +/- 11%; P = 0.276) or, counter to the hypothesis, the increase in MCAV(mean) during nBack testing (mean difference from normothermia to hyperthermia: 0 +/- 16 cm s(-1); P = 0.608). These findings indicate that the capacity to increase cerebral perfusion during cognitive activation is unaffected by hyperthermia.

Place, publisher, year, edition, pages
2013. Vol. 98, no 11, 1597-1607 p.
National Category
Physiology
Identifiers
URN: urn:nbn:se:umu:diva-93509DOI: 10.1113/expphysiol.2013.074104ISI: 000340936400010OAI: oai:DiVA.org:umu-93509DiVA: diva2:761848
Available from: 2014-11-09 Created: 2014-09-23 Last updated: 2018-01-11Bibliographically approved

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