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Age- and sex-related differences in sympathetic vascular transduction and neurohemodynamic balance in humans.
Am J Physiol Heart Circ Physiol
October 2023
Neurovascular Research Laboratory, School of Kinesiology, Western University, London, Ontario, Canada.
Bursts of muscle sympathetic nerve activity (MSNA) and the ensuing vasoconstriction are pivotal determinants of beat-by-beat blood pressure regulation. Although age and sex impact blood pressure regulation, how these factors affect the central and peripheral arcs of the baroreflex remains unclear. In 27 young [25 (SD 3) yr] males (YM; = 14) and females (YF; = 13) and 23 older [71 (SD 5) yr] males (OM; = 11) and females (OF; = 12), femoral artery blood flow, blood pressure, and MSNA were recorded for 10 min of supine rest.
View Article and Find Full Text PDFComparison of signal-averaging and regression approaches to analyzing sympathetic transduction.
Clin Auton Res
August 2022
Autonomic Cardiovascular Control and Exercise Laboratory, Division of Kinesiology, Faculty of Health, School of Health and Human Performance, Dalhousie University, 6230 South Street, Halifax, NS, B3H 4R2, Canada.
Purpose: Spontaneous sympathetic transduction reflects the vascular and/or pressor responses to bursts of muscle sympathetic nerve activity (MSNA). Separately, signal-averaging and regression-based approaches have been implemented to quantify resting sympathetic transduction. It is unknown whether the outcomes of these analytical approaches provide (dis)similar information, which is imperative for between-study comparisons and the amalgamation of results for synthesis of multiple studies (i.
View Article and Find Full Text PDFSex differences in sympathetic neurovascular and neurohemodynamic relationships during cold pressor test.
Am J Physiol Regul Integr Comp Physiol
May 2022
Cardiovascular Health and Autonomic Regulation Laboratory, McGill University, Montreal, Quebec, Canada.
Muscle sympathetic nerve activity (MSNA) affects vascular resistance differently in women and men. However, whether this sex difference persists during pronounced increases in MSNA remains unclear. Therefore, the purpose of this study was to examine sex differences in neurovascular transduction during cold pressor test (CPT)-mediated sympathoexcitation.
View Article and Find Full Text PDFSympathetic neurohemodynamic transduction is attenuated in older males independent of aerobic fitness.
Clin Auton Res
February 2022
Autonomic Cardiovascular Control and Exercise Laboratory, Division of Kinesiology, School of Health and Human Performance, Faculty of Health, Dalhousie University, 6230 South Street, Halifax, NS, B3H 4R2, Canada.
Can Dyssynergia of Vestibulosympathetic and Baroreflexes Cause Vestibular Syncope? The Hypothesis Based on the Velocity-Storage Function.
Cerebellum
April 2022
Dizziness Center, Clinical Neuroscience Center, Department of Neurology, Seoul National University Bundang Hospital, Seongnam, South Korea.
The mechanism of vestibular syncope, the syncope occurring during the vertigo attacks, remains uncertain. This study aims to clarify the mechanism of vestibular syncope by pursuing the function of vestibular system in cardiovascular autonomic control and by defining neuro-hemodynamic changes in vestibular syncope. By integrating the velocity-storage (VS) circuit in the brainstem and cerebellum, we propose that the vestibular syncope develops as a result of dyssynergia of the vestibulosympathetic and baroreflexes in which centrally estimated downward inertial acceleration during the vertigo attacks acts as a trigger.
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