Medical practitioners have used a form of biofeedback for years by using instruments like the thermometer, sphygmomanometer, and electrocardiograph to obtain information about specific on-going functions in the body.
Biofeedback training involves a similar process.
Electronic instruments are attached to the body which feed back information to the person about the current state of his or her body functions. The instruments display this information in the form of meters, sound, and digital read-outs. Biofeedback training involves using the information from these instruments in learning how to relax and reduce unwanted tension in the body. Biofeedback training is effective in helping reduce such stress-related symptoms as headaches, muscular pain, nervousness, and insomnia. Biofeedback training is most effective when combined with daily relaxation techniques and calm thinking.