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The time course of salt-induced hypertension, and why it matters

International Journal of Obesity volume 32, pages S35–S47 (2008)Cite this article

Abstract

The epidemiology of salt-induced hypertension has been explored in detail in animal studies, in some cases involving exposures to excess dietary salt for much of the animal's lifespan. The results of these studies demonstrate the presence of two distinct time courses of the blood pressure response to a high salt intake: an acute (rapid) blood pressure response occurring over days to weeks, and a slow and progressive blood pressure response that develops over extremely long periods of time, amounting to a significant fraction of the lifespan in normal individuals. The acute form of salt sensitivity is well known in humans, having often been demonstrated as a fall in blood pressure during the period of salt restriction. The slow and progressive form of salt sensitivity has been demonstrated directly in rats and chimpanzees and is also evident in analyses of human cross-population data as a salt dependency of age-associated changes of blood pressure. This slow and progressive component of salt-induced hypertension may be attributable, at least in part, to a progressive rise in the acute salt sensitivity of blood pressure during sustained exposure to high salt. However, a progressively irreversible or ‘self sustaining’ component of salt-induced hypertension has also been demonstrated in rat studies. This irreversible component has not been completely characterized, but its presence raises the possibility that blood pressure responses to salt restriction may not fully reveal the contribution of salt to blood pressure or the epidemiology of hypertension. These various components of salt sensitivity (acute vs slow, reversible vs irreversible) should be considered in any comprehensive explanation of the effects of salt on blood pressure and especially in experimental studies of the genetic and physiological mechanisms underlying salt-induced hypertension.

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Acknowledgements

We thank Diane Gilmore, Jennica Gilmore and Linda Chafe for their assistance in the preparation of the paper. This study was supported by a grant from the Canadian Institutes of Health Research (no. 64440).

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  1. Division of BioMedical Sciences, Faculty of Medicine, Memorial University of Newfoundland, St. John's, Newfoundland, Canada

    B N Van Vliet

  2. Institute of Physiology, University of Fribourg, Fribourg, Switzerland

    J-P Montani

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Bruce N Van Vliet has received a grant from the Canadian Institute of Health Research. Jean-Pierre Montani has declared no financial interests.

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Van Vliet, B., Montani, JP. The time course of salt-induced hypertension, and why it matters. Int J Obes 32 (Suppl 6), S35–S47 (2008). https://doi.org/10.1038/ijo.2008.205

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