The impact of Gilenya (Fingolimod) on the autonomic nervous system is quantitavely measured, using a state-of-the-art technique. Non-invasive blood pressure measurement is performed with the Finometer Pro (Finapres Medical Systems, NL) under different paradigms (breathing at rest, deep breath, valsalva maneuver, active standing). In addition the sympathetic skin reaction is performed. The non-invasive blood pressure measurements are done by continuous, plethysmographic blood pressure measurement at the index finger, while the patient is performing the tasks mentioned above. By interpreting the blood pressure curve, heart rate and blood pressure variability are calculated. The sympathetic skin reaction consists of measuring the change of electric conductibility of the skin (palms and soles) after an electric stimulus of a peripheral nerve. These parameters allow to assess the functionality of four important autonomic functional systems (orthostasis, sympathetic adrenergic, sympathetic cholinergic, parasympathetic cholinergic). Normative data has been acquired in our lab.