Sympathetic nerve activity connects vestibulosympathetic reflex to cardiovascular reflexes

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Form 1997 onwards various researchers have started investigating keenly on vestibule-sympathetic reflex’s interaction with cardiovascular reflexes. Ray CA has studied regulation of MSNA activity by vestibular system in humans by using head-down rotation (HDR) in the prone position. These studies have clearly demonstrated increases in muscle sympathetic nerve activity (MSNA) and calf vascular resistance during HDR. These responses are mediated by engagement of the otolith organs and not the semicircular canals.

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