Exercises that promote relaxation of the muscles and provide relief from the effects of tension are useful in a wide variety of disorders ranging from mild tension headache to insomnia. Patients who are especially tense may require several sessions of instruction in relaxation before they can learn the technique.

It is the professional determination of your Physical Therapist to decide when and how he/she will include this technique in your treatment plan.
Most likely the Electrical Stimulation will be in addition to therapeutic exercises or manual therapy techniques that your therapist will choose to best treat you.