**1. Introduction**

The autonomic nervous system (ANS), the dysregulation of which, called dysautonomia, is a frequent and often unrecognized condition which is accompanied by polymorphic functional manifestations [1]. The exploration of the ANS has gained renewed interest in recent years, due to the demonstration of the major role of its alterations in the genesis and aggravation of several diseases [2]. The importance of type 2 diabetes (T2DM) comes not only from its growing prevalence around the world leading the World Health Organization (WHO) to consider it a significantly expanding epidemic; but also given its human and economic consequences, making it a major public health problem.
