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Arterial baroreflex control of sympathetic vasoconstrictor traffic and orthostatic intolerance after head-down bed
1Dept. of Autonomic Neuroscience, Research Institute of Environmental Medicine, Nagoya University, Japan.
Journal of Gravitational Physiology : a Journal of the International Society for Gravitational Physiology
|April 17, 2003
Abstract:
The purpose of the present study is to examine the changes in the arterial baroreflex control of muscle sympathetic nerve activity (MSNA) after head-down bed rest (HDBR), in relation to orthostatic hypotension after HDBR. Therefore, we performed 60 degrees head-up tilt (HUT) tests before and after 14 days of HDBR, with monitoring MSNA, heart rate and blood pressure. We calculated the gain of the arterial baroreflex control of MSNA, and compared the gains between the subjects who did (defined as the fainters) and those who did not (defined as the nonfainters) become presyncopal in HUT tests after HDBR.