Biofeedback

Original Editor - Professor Tim Watson Lead Editors - If you would like to be a lead editor on this page, please contact us.

Definition

Biofeedback is the technique of using equipment to reveal to human beings some of their internal physiological events, normal and abnormal, in the form of visual and auditory signals in order to teach them to manipulate these otherwise involuntary or unfelt events by manipulating the displayed signals. [1] The ultimate purpose is that the patient gets to know his own body signs and that he can control them consciously. In first place using biofeedback equipment, afterwards even without. [2]
Further, neuromuscular training or biofeedback therapy is an instrument-based learning process that is based on “operant conditioning” techniques. The governing principal is that any behavior-be it a complex maneuver such as eating or a simple task such as muscle contraction-when reinforced its likelihood of being repeated and perfected increases several fold. [8]

Different types of biofeedback

The practice of biofeedback has developed markedly over the last few years, and many different forms of feedback are currently employed in the clinical setting.
The most commonly used forms of biofeedback therapy are:
- Electromyography (EMG), measures muscle tension
- Thermal biofeedback, measures skin temperature
- Neurofeedback/ electroencephalography (EEG), measures brain wave activity
- Electrodermography (EDG), measures skin electrical activity
- Heat Flux, measures the rate at which heat is being dissipated from body
- Pneumography, measures abdominal/chest movement when breathing
- Capnometer, measures end-tidal CO2
- Hemoencephalography, measures the differences in the color of light reflected back through the scalp based on the relative amount of oxygenated and unoxygenated blood in the brain
- Photoplethysmograph (PPG), measures peripheral blood flow, heart rate,
and heart rate variability
[3,4]
The wide range of inputs means that many applications can be developed from the existing equipment. The limits to biofeedback applications are largely with the therapist. Given an understanding of the basic principles of the therapy in combination with a clinical understanding of the patients problem, there are many novel applications for the therapy. Given the limited scope of this document, the following consideration will focus exclusively on EMG Biofeedback.

Mechanism of action

The autonomic nervous system regulates the functioning of the organs and functions of the body like breathing and heart beating. It isn’t dominated by our will, but it reacts to our mood. There are two major components of the autonomic nervous system, the sympatic and the parasympatic systems. The parasympaticus works in particular at rest and recuperation. The sympaticus works at efforts.
Due to chronic stress the autonomic nervous system can function worse, consequently the regulation of the body may get disrupted and a disbalance between the two systems may arise. [5]

Features of the EMG Devices

• Gain settings
• Sound
• Threshold
• Peak Hold facility

Read about these features here ...

The content on or accessible through Physiopedia is for informational purposes only. Physiopedia is not a substitute for professional advice or expert medical services from a qualified healthcare provider. Read more.