\authorcode{2} \subjectcode{16} Relationships among different cardiovascular parameters (RR interval, arterial pressure, central venous pressure), respiration and direct recording of post-ganglionic neural sympathetic discharge activity (MSNA) in physiological conditions (recumbent position, orthostasis and light physical exercise) and in pathophysiology (neurally mediated syncope, chronic orthostatic intolerance, ulcerative colitis, fibromyalgia and Parkinson’s disease). Evaluation of arterial and cardiopulmonary baroreflex function in the time and frequency domains My group is also dealing with: Modelling of Autonomic Nervous System using univariate and multivariate techniques, analysis of complexity and causality. Non-linear methodology such as entropy, predictability and symbolic dynamics applied to bivariate processes.