Chronic Tension Headache
Headache is the most common pain complaint1 and the most frequent medical problem seen in medical clinics.2 Most experts3 believe that the majority of headaches are muscle tension-type. Community-based epidemiological studies have found that 14 percent of men and 29 percent of women have had headaches either every few days or headaches which significantly bothered them.4
Tension headache is generally described as a bilateral dull ache, pressure or cap-like pain that is usually located in the forehead, neck and shoulder regions. The headache typically occurs from two to seven days a week and can last from one hour to all day; a small proportion of tension headache sufferers have continuous headache. Migraine head-ache, on the other hand, is described as a unilateral pain, generally ac-companied with nausea and vomiting, with the pain characterized as throbbing or pulsating. Clinicians who deal with headache patients should use a standardized set of inclusion and exclusion criteria for diagnosis such as specified by the Ad Hoc Committee on the Classification of Headache5 or the newer Ad Hoc Committee of the International Headache Society.6
Treatment of Chronic Tension Headache
Behavioral treatments for chronic tension headache have been found to be as effective as pharmacological interventions.7 Although nearly all of the headache literature treats biofeedback and relaxation therapy as separate interventions, most clinicians combine both procedures when treating their tension head-ache patients.
A study by Holroyd and his colleagues8 detected no significant difference between subjects who trained to increase or decrease their muscle tension levels; high success feedback groups showed substantially greater improvements in headache activity (53 percent) than low success groups (26 percent). This study demonstrated the importance that cognitive mediating factors such as perceived success and self efficacy play in biofeedback training, and the enhanced awareness of ones level of muscle tension during non-biofeedback periods. Thus, the emphasis on biofeedback training with tension headache should focus on skill acquisition and the clinician-patient relationship.
Initial Session Strategies
We say something like this: "Its traditionally been assumed that the type of headache you have – tension headache – is caused by very high levels of muscle tension in your forehead, neck and shoulder areas. These muscles have been tense for a long time. Through biofeedback training, you will learn to both be aware of and decrease your muscle tension levels at any time. When you do this, its hoped that you will get a decrease in your headaches."
We next give the patient a number of possible strategies to choose from. We emphasize that learning the biofeedback response is purely an idiosyncratic process and that what works for others may not work for them. We customarily describe six possible biofeedback strategies outlined in Table 1.
In the first session, we usually tell the patient to pick only one strategy and stick with it the entire session. We keep the initial session short – a three to five minute adaptation period (Just sit quietly with your eyes closed) and a maximum of 12 minutes of biofeedback. (In latter sessions, we increase the biofeedback portion to a maximum of 25 minutes). We emphasize that learning to relax muscles at will can be a difficult response to learn and that it may take some time before they can lower their forehead muscle tension reliably; we tell them not to get discouraged if they cannot control their sEMG levels immediately. We instruct the patients to let the response occur rather than make it occur, to be passive rather than try to force their forehead muscles to relax. We let them choose which type of visual and auditory feedback they like. At the end of the biofeedback session when the sensors are removed and the sessions data is saved, we inquire as to which strategy was employed and the patients perception as to how effective it was. We also get a self-report of relaxation, muscle tension and pain levels on a one to 10 scale prior to and following the session. If using a computer, we review the actual minute by minute printout of the data with the patient. Throughout this review we attempt to impart to the patient the most positive feeling of success gained, based on the realities of the sessions data. The number of sessions may run from 10 to as many as 24.
Coaching and Clinician Attitude
The first, and most important thing for a clinician to determine about coaching, is whether a patient wants and could benefit from coaching. This is truly idiosyncratic. There are three general situations during sEMG biofeedback that you have to be prepared for:
Situation 1– The patient has decreased forehead muscle tension levels.
Possible responses are: "That's fantastic! Keep up the good work. I want you to remember what you are doing now so you can tell me at the end of the session. Real good! Try to get it even lower."
Situation 2– The patient has not been able to decrease forehead muscle tension levels.
Possible responses are: "That's OK. It’s as important to find out what makes it go up as it is to find out what makes it go down. I want you to remember what you're doing now so you can tell me at the end of the session. That's OK. You can only go up so far before you have to start going down. You seem to be going up; you might want to switch to a different strategy."
Situation 3– The patient seems frustrated or appears to be trying too hard.