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• W2227391509 endingPage "H1046" @default.
• W2227391509 startingPage "H1040" @default.
• W2227391509 abstract "Arterial hypocapnia has been associated with orthostatic intolerance. Therefore, we tested the hypothesis that hypocapnia may be detrimental to increases in muscle sympathetic nerve activity (MSNA) and total peripheral resistance (TPR) during head-up tilt (HUT). Ventilation was increased approximately 1.5 times above baseline for each of three conditions, whereas end-tidal PCO(2) (PET(CO(2))) was clamped at normocapnic (Normo), hypercapnic (Hyper; +5 mmHg relative to Normo), and hypocapnic (Hypo; -5 mmHg relative to Normo) conditions. MSNA (microneurography), heart rate, blood pressure (BP, Finapres), and cardiac output (Q, Doppler) were measured continuously during supine rest and 45 degrees HUT. The increase in heart rate when changing from supine to HUT (P < 0.001) was not different across PET(CO(2)) conditions. MSNA burst frequency increased similarly with HUT in all conditions (P < 0.05). However, total MSNA and the increase in total amplitude relative to baseline (%DeltaMSNA) increased more when changing to HUT during Hypo compared with Hyper (P < 0.05). Both BP and Q were higher during Hyper than both Normo and Hypo (main effect; P < 0.05). Therefore, the MSNA response to HUT varied inversely with levels of PET(CO(2)). The combined data suggest that augmented cardiac output with hypercapnia sustained blood pressure during HUT leading to a diminished sympathetic response." @default.
• W2227391509 created "2016-06-24" @default.
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• W2227391509 date "2001-09-01" @default.
• W2227391509 modified "2023-10-15" @default.
• W2227391509 title "P<scp>et</scp> _CO₂ inversely affects MSNA response to orthostatic stress" @default.
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• W2227391509 doi "https://doi.org/10.1152/ajpheart.2001.281.3.h1040" @default.
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