Sudomotor is controlled by a division of sympathetic system and it is relating to, or being nerve fibers controlling the activity of sweat glands (post sympathetic cholinergic fiber or C-fibers).

The Galvanic Skin Response (GSR) is defined as a change in the electrical properties of the skin. The signal can be used for capturing the autonomic nerve responses as a parameter of the sweat gland function.

Heart rate variability (HRV) is the physiological phenomenon of variation in the time interval between heartbeats. It is measured by the variation in the beat-to-beat interval.

The photoelectrical Plethysmography displays the contour of the peripheral pulse waveform related with the volume changes in artery.

Bioelectrical impedance analysis (BIA) is a widely used technique for estimating body composition and it is particularly useful in large, population-based studies because it is quick, portable, inexpensive and noninvasive.

Telemedicine is the use of telecommunication and information technologies in order to provide clinical health care at a distance.