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Journal of Clinical Endocrinology & Metabolism, Vol 50, 219-222, Copyright © 1980 by Endocrine Society
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JZ Miller, FC Luft, CE Grim, DP Henry, JC Christian and MH Weinberger
Heritable influences on venous plasma norepinephrine (PNe) and urinary norepinephrine (UNe) values were examined in normotensive monozygotic and dizygotic twins during volume expansion and contraction. The presence of genetic variance was tested by calculating the within-pair estimate of genetic variance. Significant genetic variance was found to influence PNe during recumbency before and after a 4-h iv infusion of 2 liters saline. Similarly, heritable influences on UNe excretion were observed in a 10-h urine collection after the sodium load. Heritable influences on PNe or UNe were not observed after postural stimulation or volume contraction. The data suggest that sympathetic nervous system activity is influenced by heritable factors which may contribute to the development of hypertension in some individuals.
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