Abstract
Background We hypothesized that impaired stress-induced pressure natriuresis increases blood pressure (BP) load. Methods The 118 African American youths were brought into similar levels of sodium balance. The protocol consisted of a 2-h baseline period, a 1-h stress period (competitive video games), and a 2-h recovery period. Results: Normal pressure natriuresis ( n = 80) resulted from a resistance-mediated (r = 0.23; P < .03) increase in BP ( P < .001). In contrast, impaired pressure natriuresis ( n = 38), leading to an extended period of elevated BP ( P < .05), resulted from a volume-mediated (r = 0.55; P < .002) increase in BP ( P < .001). Conclusions: Impaired stress-induced pressure natriuresis may contribute to the development of essential hypertension, particularly in African Americans.
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