Sex differences in dynamic blood pressure regulation: beat-by-beat responses to muscle sympathetic nerve activity

Author:

Coovadia Yasmine1,Adler Tessa E.1ORCID,Steinback Craig D.23,Fraser Graham M.4,Usselman Charlotte W.15

Affiliation:

1. Cardiovascular Health and Autonomic Regulation Laboratory, Department of Kinesiology and Physical Education, McGill University, Montreal, Quebec, Canada

2. Neurovascular Health Laboratory, Program for Pregnancy and Postpartum Health, Faculty of Physical Education and Recreation, University of Alberta, Edmonton, Alberta, Canada

3. Women and Children’s Health Research Institute, University of Alberta, Edmonton, Alberta, Canada

4. Division of BioMedical Sciences, Faculty of Medicine, Memorial University of Newfoundland, St. John’s, Newfoundland and Labrador

5. McGill Research Centre for Physical Activity and Health, McGill University, Montreal, Quebec, Canada

Abstract

We demonstrate that during acute sympathoinhibition, women demonstrate more sustained increases in blood pressure following sympathetic bursts of activity than men. Likewise, during prolonged sympathetic quiescence, blood pressure is less labile in women than men. This suggests that lower overall blood pressure in young women may not be mediated by smaller beat-by-beat changes in blood pressure in response to sympathetic outflow but may instead be mediated by a lower frequency of sympathetic bursts.

Publisher

American Physiological Society

Subject

Physiology (medical),Cardiology and Cardiovascular Medicine,Physiology

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