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• W1775320818 startingPage "H559" @default.
• W1775320818 abstract "The relative contributions of a central neural oscillator and of the delay in α-adrenergic transmission within the baroreflex loop in the predominance of low-frequency (LF) cardiovascular variability during sympathetic activation in humans are unclear. We measured R-R interval (RR), muscle sympathetic nerve activity (MSNA), blood pressure (BP), and their variability in 10 normal subjects during sympathetic activation achieved by BP lowering with sodium nitroprusside (SNP) and α-adrenergic blockade using phentolamine. SNP and phentolamine induced comparable reductions in BP ( P > 0.25). Despite tachycardia and sympathetic activation with both SNP and phentolamine, LF variability in RR, MSNA, and BP increased during SNP and decreased during phentolamine (SNP: RR +20 ± 6%, MSNA +3 ± 5%, systolic BP +9 ± 6%, diastolic BP +7 ± 5%; phentolamine: RR −2 ± 7%, MSNA −34 ± 6%, systolic BP −16 ± 8%, diastolic BP −13 ± 4%, P< 0.05 except systolic BP, where P = 0.09). Thus LF variability is reduced when sympathetic activation is induced by α-adrenergic blockade. This suggests that α-adrenergic transmission within the baroreflex loop may contribute importantly to the predominance of LF cardiovascular variability associated with sympathetic excitation in humans." @default.
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• W1775320818 date "2001-08-01" @default.
• W1775320818 modified "2023-09-24" @default.
• W1775320818 title "Contrasting effects of phentolamine and nitroprusside on neural and cardiovascular variability" @default.
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• W1775320818 doi "https://doi.org/10.1152/ajpheart.2001.281.2.h559" @default.
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