Journal
AUTONOMIC NEUROSCIENCE-BASIC & CLINICAL
Volume 158, Issue 1-2, Pages 127-131Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.autneu.2010.07.005
Keywords
Microneurography; Human; Sympathetic nerve activity; Vestibulosympathetic
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We tested the hypothesi, that vestibular and cardiac rhythms compete to modulate muscle sympathetic nerve activity (MSNA) in human subjects Sinusoidal galvanic vestibular stimulation was applied across the mastoid processes at eat h subjects cardiac frequency and at +/- 0 1 +/- 02 +/- 03 and +/- 06 Hz Cyclic modulation of MSNA was, weakest at this central frequency (44 8 +/- 2 3% n=8) significantly lower than when delivered 0 1 Hz lower (57 7 +/- 3 3%) or 01 Hz higher (56 3 +/- 33%) than this frequency We conclude that vestibular inputs compete with baroreceptor Inputs operating at the cardiac rhythm with vestibular modulation of MSNA being lowest when competition with the baroreceptors is highest (C) 2010 Elsevier B V All rights reserved
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