Evaluation of biofeedback in the treatment of borderline essential hypertension.

Researchers tested two ways to lower mild high blood pressure. One group got direct blood-pressure biofeedback. A second group learned simple relaxation exercises.

Adults with borderline hypertension joined the study. The team tracked blood pressure in the lab and at home.

Only the top number (systolic) dropped a little. The bottom number (diastolic) did not change.

Relaxation training worked slightly better when people checked pressure at home. Direct biofeedback gave the weakest carry-over.

Yuwiler et al. (1992) tried thermal biofeedback instead of direct blood-pressure feedback. They also saw tiny, mixed results. Their big warning: office readings can make biofeedback look better than it is. You need 24-hour cuffs to know the truth.

Azrin et al. (1969) built an earlier EMG tone machine that deepens muscle relaxation. The 1979 study shows the same idea—relaxation beats fancy biofeedback for blood pressure.

Bickel et al. (1984) used EMG biofeedback on facial tics. Like the 1979 paper, they found only small drops in muscle tension. Together these studies say biofeedback effects are usually modest, no matter the target.

If you work with adults who track health data, teach simple relaxation first. It costs nothing and generalizes better than electronic feedback. When a doctor asks for biofeedback, pair it with home relaxation practice and collect 24-hour readings. Small effects can still help, but set client expectations low.