Dietary salt loading impairs arterial vascular reactivity

The American Journal of Clinical Nutrition
Alwyn S ToddRobert J Walker

Abstract

Studies of sodium have shown improvements in vascular function and blood pressure (BP). The effect of chronic sodium loading from a low-sodium diet to a Western diet on vascular function and BP has been less well studied. The objective was to examine the effects of dietary salt intake on vascular function and BP. Thirty-five hypertensive volunteers met the inclusion criteria. After a 2-wk run-in with a low-sodium diet (60 mmol/d), the participants maintained their diets and were randomly assigned to receive sequentially 1 of 3 interventions for 4 wk, with a 2-wk washout between interventions: sodium-free tomato juice (A), tomato juice containing 90 mmol Na (B), and tomato juice containing 140 mmol Na (C). The outcomes were changes in pulse wave velocity (PWV), systolic BP (SBP), and diastolic BP (DBP). The difference in PWV between interventions B and A was 0.39 m/s (95% CI: 0.18, 0.60 m/s; P < or = 0.001) and between C and A was 0.35 m/s (95% CI: 0.13, 0.57 m/s; P < or = 0.01). Differences in SBP and DBP between interventions B and A were 4.4 mm Hg (95% CI: 1.2, 7.8 mm Hg; P < or = 0.01) and 2.4 mm Hg (95% CI: 0.8, 4.1 mm Hg; P < or = 0.001), respectively, and between interventions C and A were 5.6 mm Hg (95% CI: 2.7, 8.4 mm H...Continue Reading

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