Balance between sympathetic response to head-up tilt and cardiac vagal factors in healthy humans
- 1 June 2007
- journal article
- research article
- Published by Springer Nature in Clinical Autonomic Research
- Vol. 17 (4) , 227-230
- https://doi.org/10.1007/s10286-007-0427-y
Abstract
We evaluated the association between cardio-vagal baroreflex sensitivity (BRS; assessed with modified Oxford technique) and catecholamine response to 5 min 60° head-up tilt (HUT) in 46 young healthy adults. HUT increased HR, mean arterial pressure, and NE (P < 0.05 for all). BRS was negatively correlated with NE response to HUT (r = −0.36, P < 0.05), suggesting that subjects with high vagal modulation (high BRS) require less sympathetic response (NE) to maintain normotension during orthostatic stress.Keywords
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