Some physiological factors such as sport activity or pathological as sepsis, certain chronic diseases or diabetes are known to modulate the overall autonomic activity and the intrinsic capacity of the individual to regulate its sympathovagal balance. These influences can alter the physiological autonomic balance sometimes with positive consequences on the Cardiac frequency-breathing control, blood pressure adjustment depending on the position of the individual, on the status of blood volume, but sometimes deleterious with bad regulation of sinus cardiac activity and respiration rate.