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November 1980

The Influence of Sodium Restriction on Orthostatic Sympathetic Nervous Activity

Author Affiliations

From the Endocrine-Metabolism Unit, Monroe Community Hospital, and the Department of Medicine, University of Rochester School of Medicine and Dentistry, Rochester, NY.

Arch Intern Med. 1980;140(11):1485-1489. doi:10.1001/archinte.1980.00330220052019

• To evaluate the influence of low-salt diet on the sympathetic nervous system activity, the adaptation to upright posture in five normal subjects was studied during normal salt and 10-mEq sodium and 60-mEq potassium diets. On assuming upright posture, there were similar rises in pulse rate and diastolic blood pressure (BP) but a decline in systolic BP, during both diets. A prompt rise in plasma norepinephrine level during low-sodium diet was greater than during normal diet. Orthostatic response of the plasma epinephrine level was small, although significant, but unaffected by the diets. During normal-sodium diet, plasma renin activity response was delayed, but a prompt and enhanced response was observed during low-sodium diet. These data suggest that sodium deprivation enhances the sympathetic nervous system activity and the orthostatic stimulation of renin release.

(Arch Intern Med 140:1485-1489, 1980)