In theory, a subject can learn to control his internal organs and vital functions; it might therefore be possible for a patient with essential hypertension to learn how to reduce his/her blood pressure.
Biofeedback has been used to control heart rate, blood pressure, migraine head aches, and to relax spastic muscles.
It is used to provide information about muscle activity during ambulation, for example, in patients with brain injury, stroke, or cerebral palsy.
This has been used primarily in the treatment of headaches.2. The monitoring of skin temperature as an index of blood flow changes because of the dilation and constriction of blood vessels, the feedback being displayed to the patient on a video monitor, accompanied by an audible signal.
It is used for stress management and in the treatment of hypertension, migraine, and Raynaud disease (usually a bilateral disease of the blood vessels; especially, of the extremities which might be caused by cold or emotion, accompanied by intermittent pallor, cyanosis, and redness, and generally accompanied by pain).