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• W1937689969 endingPage "1522" @default.
• W1937689969 startingPage "1516" @default.
• W1937689969 abstract "Obstructive apnea and voluntary breath holding are associated with transient increases in muscle sympathetic nerve activity (MSNA) and arterial pressure. The contribution of changes in blood flow relative to the contribution of changes in vascular resistance to the apnea-induced transient rise in arterial pressure is unclear. We measured heart rate, mean arterial blood pressure (MAP), MSNA (peroneal microneurography), and femoral artery blood velocity ( V FA , Doppler) in humans during voluntary end-expiratory apnea while they were exposed to room air, hypoxia (10.5% inspiratory fraction of O 2 ), and hyperoxia (100% inspiratory fraction of O 2 ). Changes from baseline of leg blood flow (Q˙) and vascular resistance (R) were estimated from the following relationships: Q˙ ∝ V FA , corrected for the heart rate, and R ∝ MAP/Q˙. During apnea, MSNA rose; this rise in MSNA was followed by a rise in MAP, which peaked a few seconds after resumption of breathing. Responses of MSNA and MAP to apnea were greatest during hypoxia and smallest during hyperoxia ( P < 0.05 for both compared with room air breathing). Similarly, apnea was associated with a decrease in Q˙ and an increase in R. The decrease in Q˙ was greatest during hypoxia and smallest during hyperoxia (−25 ± 3 vs. −6 ± 4%, P < 0.05), and the increase in R was the greatest during hypoxia and the least during hyperoxia (60 ± 8 vs. 21 ± 6%, P < 0.05). Thus voluntary apnea is associated with vasoconstriction, which is in part mediated by the sympathetic nervous system. Because apnea-induced vasoconstriction is most intense during hypoxia and attenuated during hyperoxia, it appears to depend at least in part on stimulation of arterial chemoreceptors." @default.
• W1937689969 created "2016-06-24" @default.
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• W1937689969 date "2001-04-01" @default.
• W1937689969 modified "2023-10-10" @default.
• W1937689969 title "Hypoxia augments apnea-induced peripheral vasoconstriction in humans" @default.
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• W1937689969 doi "https://doi.org/10.1152/jappl.2001.90.4.1516" @default.
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