Overall functioning of a living organism is controlled by the autonomic nervous system. It has two antagonistic branches – the sympathetic and parasympathetic nervous systems. Every organ is activated by one branch and inhibited by the other.
Generally, when the body is in a calm state (relaxation, sleep, etc.), organs such as the heart, lungs, and blood vessels are under parasympathetic control. When active (during physical activity, psycho-emotional arousal or stress) these organs are dominated by the sympathetic nervous system.
A healthy organism is capable of adjusting to any external influence by means of quick and adequate sympathetic response. Once that factor disappears, parasympathetic activity increases, which balances overall autonomic activity.
It is important to use specific tools to evaluate the level of balance between these 2 branches of the autonomic nervous system, their reaction to specific provocative test factors, and the overall condition of both branches. Such tools can help people learn how to cope with stress by achieving an autonomic balance.
The specific tools I employ are HRV (Heart Rate Variability) and Postural Hypotension.
HRV is a simple, 15 minute, non-invasive test performed in office. Infra-red light is emitted on the finger or ear and then a pulse wave signal is measured by means of a portable and convenient finger or ear-clip optical sensor.