Pressor Responses to Laboratory Stresses and Daytime Blood Pressure Variability

56 patients with essential hypertension

Standardized laboratory mental and physical challenges (mental arithmetic, a reaction time test, isometric exercise, and submaximal bicycle exercise) with direct blood pressure measurement via brachial artery catheter

Correlation between the increase in mean arterial pressure (MAP) during laboratory challenges and the variability of ambulatory mean arterial pressure over 24 hourssurrogate