Suboccipital inhibitory pressure technique. According to this technique, the suboccipital musculature is palpated until contact is made with the posterior arch of the atlas, and progressive and deep gliding pressure is applied, pushing the atlas anteriorly. The occiput rests on the hands while the atlas is supported by the fingertips. Finger pressure must be maintained for 10 minutes to produce the therapeutic effect of inhibiting the suboccipital soft tissues.

Suboccipital inhibitory pressure technique. This technique is performed along an imaginary vertical line passing through the odontoid process of the axis. No flexion or extension and very little lateroflexion are used. Application is bilateral. First, cephalic decompression is performed lightly, followed by small circumductions. Selective tension is applied to take up tissue slack and create a firm joint barrier. Manipulation is then performed with rotation towards the manipulated side in a helicoidal cranial movement. This technique is designed to correct a generalized dysfunction with the aim of restoring occiput, atlas, and axis joint mobility.

Consisted in applying the above two techniques using exactly the same sequence: first the SI technique, and then the SM technique.

The subjects received no treatment, but attended the same number of sessions, maintaining the resting position for longer than the experimental groups, and underwent the same evaluations (test for arterial compromise, and the three assessments).

According to this technique, the suboccipital musculature is palpated until contact is made with the posterior arch of the atlas, and progressive and deep gliding pressure is applied, pushing the atlas anteriorly. The occiput rests on the hands while the atlas is supported by the fingertips. Finger pressure must be maintained for 10 minutes to produce the therapeutic effect of inhibiting the suboccipital soft tissues. The aim is to suppress spasm of the muscles and in general of the suboccipital soft tissues which are responsible for any dysfunctional mobility of the occiput, atlas, or even the axis.

These included major aspects for TTH verification, including frequency of noted pain (less than 15 days monthly = ETTH; more than 15 days monthly = CTTH) response to the classification of the IHS.

These included major aspects for TTH verification, including severity of pain response to the classification of the IHS.

To assess the subject's quality of life, we applied the health status questionnaire SF-12v2 (Short Form 12 Health Survey) which has shown to be highly reliable. This questionnaire has been adapted to the Spanish context by Alonso et al. and Monteagudo et al.