 On day 28 in the first treatment period the study participants meet at the hospital again. This day to be further tested with the intravenous Ang II infusion followed by continuous measurement of blood pressure and the aldosterone response using blood samples. Before, during and after the intravenous Ang II infusion blood pressure will be measured with Finger Plethysmography and conventional brachial blood pressure measurement. Vascular tonus before, during and after the intravenous Ang II infusion will be evaluated with the use of Impedance Cardiography, Finger Plethysmography and Doppler Ultrasound measurements of blood flow. 