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Dietary magnesium supplementation modifies blood pressure and cardiovascular function in mineralocorticoid-salt hypertensive rats but not in normotensive rats #MMPMID7722684
Laurant P; Kantelip JP; Berthelot A
J Nutr 1995[Apr]; 125 (4): 830-41 PMID7722684show ga
The purpose of this study was to determine the effect of dietary magnesium supplementation on blood pressure and cardiovascular function of Sprague-Dawley normotensive and mineralocorticoid-salt (DOCA-salt) hypertensive rats. The rats were pair-fed for 5 wk a purified diet containing either a normal or magnesium-supplemented diet (1.5 or 10 g/kg diet). Magnesium supplementation significantly lowered blood pressure levels in hypertensive rats, but not in normotensive rats. Heart rate was not affected in either group. The blood pressure-lowering effect of magnesium supplementation in DOCA-salt hypertensive rats was associated with a lower in vivo cardiovascular reactivity to norepinephrine and angiotensin II. Norepinephrine reactivity in isolated aortae from DOCA-salt hypertensive rats was not modified by magnesium supplementation. However, endothelium-dependent relaxation to acetylcholine was improved and could be related to the release of endothelial relaxant factors. Magnesium supplementation did not affect cardiac hemodynamics in isolated heart from either normotensive or DOCA-salt hypertensive rats. Furthermore, no protective effects upon myocardial ischemia and ventricular arrhythmias were demonstrated. These findings suggest that the lowering effect of magnesium supplementation on blood pressure in hypertensive rats may be related to a vascular effect of magnesium that reduces vascular tone. Mechanisms related to the pathophysiological development of mineralocorticoid-salt hypertension may be involved.