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Baltimore Highlands, MD, United States

Montasser M.E.,University of Maryland, Baltimore | Douglas J.A.,University of Michigan | Roy-Gagnon M.-H.,University of Michigan | Van Hout C.V.,University of Michigan | And 10 more authors.
Journal of Clinical Hypertension

Although the beneficial effects of lowering salt intake in hypertensive patients are widely appreciated, the impact of promoting dietary salt restriction for blood pressure (BP) reduction at the population level remains controversial. The authors used 24-hour ambulatory BP monitoring to characterize the determinants of systolic BP (SBP) response to low-salt intake in a large, relatively healthy Amish population. Patients received a high- and low-sodium diet for 6days each, separated by a 6- to 14-day washout period. Variance component analysis was used to assess the association of several variables with SBP response to low-salt diet. Mean SBP was 0.7±5.8mmHg and 1.3±6.1 mmHg lower on the low-salt compared with the high-salt diet during daytime (P=008) and nighttime (P<.0001), respectively. SBP response to a low-salt diet was significantly associated with increasing age and pre-intervention SBP, in both daytime and nighttime, while the association with female sex and SBP response to cold pressor test (CPT) was significant only during nighttime. Our results suggest that salt reduction may have greater BP-lowering effects on women, older individuals, individuals with higher SBP, and individuals with higher SBP response to CPT. © 2011 Wiley Periodicals, Inc.. Source

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