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Acute intermittent hypercapnic hypoxia and sympathetic neurovascular transduction in men

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Awdur
Stuckless, Troy
Vermeulen, Tyler
Brown, Courtney
Boulet, Lindsey
Shafer, Brooke
Wakeham, Denis
Steinback, Craig
Ayas, Najib
Floras, John
Foster, Glen
Dyddiad
2019-12-05
Dyddiad derbyn
2019-12-03
Math
Article
Cyhoeddwr
Wiley
ISSN
1469-7793
Metadata
Dangos cofnod eitem llawn
Crynodeb
Acute intermittent hypercapnic hypoxia (IH) induces long‐lasting elevations in sympathetic vasomotor outflow and blood pressure in healthy humans. It is unknown whether IH alters sympathetic neurovascular transduction (sNVT), measured as the relationship between sympathetic vasomotor outflow and either forearm vascular conductance (FVC; regional sNVT) or diastolic blood pressure (systemic sNVT). We tested the hypothesis that IH augments sNVT by exposing healthy males to 40 consecutive 1 min breathing cycles, each comprising 40 s of hypercapnic hypoxia (urn:x-wiley:00223751:media:tjp13923:tjp13923-math-0001: +4 ± 3 mmHg above baseline; urn:x-wiley:00223751:media:tjp13923:tjp13923-math-0002: 48 ± 3 mmHg) and 20 s of normoxia (n = 9), or a 40 min air‐breathing control (n = 7). Before and after the intervention, lower body negative pressure (LBNP; 3 min at –15, –30 and –45 mmHg) was applied to elicit reflex increases in muscle sympathetic nerve activity (MSNA, fibular microneurography) when clamping end‐tidal gases at baseline levels. Ventilation, arterial pressure [systolic blood pressure, diastolic blood pressure, mean arterial pressure (MAP)], brachial artery blood flow (urn:x-wiley:00223751:media:tjp13923:tjp13923-math-0003BA), FVC (urn:x-wiley:00223751:media:tjp13923:tjp13923-math-0004BA/MAP) and MSNA burst frequency were measured continuously. Following IH, but not control, ventilation [5 L min–1; 95% confidence interval (CI) = 1–9] and MAP (5 mmHg; 95% CI = 1–9) were increased, whereas FVC (–0.2 mL min–1 mmHg–1; 95% CI = –0.0 to –0.4) and mean shear rate (–21.9 s–1; 95% CI = –5.8 to –38.0; all P < 0.05) were reduced. Systemic sNVT was increased following IH (0.25 mmHg burst–1 min–1; 95% CI = 0.01–0.49; P < 0.05), whereas changes in regional forearm sNVT were similar between IH and sham. Reductions in vessel wall shear stress and, consequently, nitric oxide production may contribute to heightened systemic sNVT and provide a potential neurovascular mechanism for elevated blood pressure in obstructive sleep apnoea.
Cyfnodolyn/trafodion cynhadledd
The Journal of Physiology;
Dyfyniad
Stuckless, T.J., Vermeulen, T.D., Brown, C.V., Boulet, L.M., Shafer, B.M., Wakeham, D.J., Steinback, C.D., Ayas, N.T., Floras, J.S. and Foster, G.E. (2020) 'Acute intermittent hypercapnic hypoxia and sympathetic neurovascular transduction in men', The Journal of Physiology, 598(3), pp.473-487.
URI
http://hdl.handle.net/10369/11042
Dynodwr Gwrthrych Digidol (DOI)
https://doi.org/10.1113/JP278941
Disgrifiad
Article published in The Journal of Physiology on 05 December 2019, available at: https://doi.org/10.1113/JP278941.
Hawliau
http://www.rioxx.net/licenses/all-rights-reserved
Nawdd
Cardiff Metropolitan University (Grant ID: Cardiff Metropolian (Internal))
NSERC, CFI, HSFC, MSFHR
Casgliadau
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