Diminished pulse pressure response to psychological stress: early precursor of essential hypertension?

An excessive blood pressure response to mental stress is a widely reported characteristic of young normotensive offspring of hypertensive parents. At odds with these reports are data from a large biracial study showing that high risk adolescent offspring had diminished pulse pressure under mental stress and no evidence of greater blood pressure reactivity. We examined this apparent contradiction in a similar but larger sample of 213 normotensive adolescents, comparing blood pressure and heart rate responses to video game, mirror drawing, mental arithmetic, interview, and physical exercise in high- and low-risk offspring. Results replicated the diminished pulse pressure finding, suggesting it is characteristic of African Americans and is evoked by behavioral tasks that entail skeletal-motor inhibition. Submaximal physical exercise failed to discriminate between offspring groups. Possible biologic correlates of diminished pulse pressure in black adolescents with "high normal" blood pressure warrant further investigation.