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This Article Full Text Full Text (PDF) All Versions of this Article: 93/6/715    most recent expphysiol.2007.039545v1 Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Google Scholar Articles by Joyner, M. J. Articles by Wallin, B. G. PubMed PubMed Citation Articles by Joyner, M. J. Articles by Wallin, B. G. Related Collections Review Articles Lectures Cardiovascular control

¹ Departments of Anesthesiology and Physiology & Biomedical Engineering, Mayo Clinic College of Medicine, 200 First Street SW, Rochester, MN 55905, USA ² Department of Clinical Neurophysiology, Sahlgren University Hospital, S-413 45 Goteborg, Sweden

Abstract

New ideas about the relative importance of the autonomic nervous system (and especially its sympathetic arm) in long-term blood pressure regulation are emerging. It is well known that mean arterial blood pressure is normally regulated in a fairly narrow range at rest and that blood pressure is also able to rise and fall ‘appropriately’ to meet the demands of various forms of mental, emotional and physical stress. By contrast, blood pressure varies widely when the autonomic nervous system is absent or when key mechanisms that govern it are destroyed. However, 24 h mean arterial pressure is still surprisingly normal under these conditions. Thus, the dominant idea has been that the kidney is the main long-term regulator of blood pressure and the autonomic nervous system is important in short-term regulation. However, this ‘renocentric’ scheme can be challenged by observations in humans showing that there is a high degree of individual variability in elements of the autonomic nervous system. Along these lines, the level of sympathetic outflow, the adrenergic responsiveness of blood vessels and individual haemodynamic patterns appear to exist in a complex, but appropriate, balance in normotension. Furthermore, evidence from animals and humans has now clearly shown that the sympathetic nervous system can play an important role in longer term blood pressure regulation in both normotension and hypertension. Finally, humans with high baseline sympathetic traffic might be at increased risk for hypertension if the ‘balance’ among factors deteriorates or is lost. In this context, the goal of this review is to encourage a comprehensive rethinking of the complexities related to long-term blood pressure regulation in humans and promote finer appreciation of physiological relationships among the autonomic nervous system, vascular function, ageing, metabolism and blood pressure.

(Received 11 January 2008; accepted after revision 3 March 2008; first published online 7 March 2008)
Corresponding author M. J. Joyner: Mayo Clinic, Rochester, MN 55905, USA.  Email: joyner.michael{at}mayo.edu