Postisometric Relaxation (PIR) – is one of the safest methods of manual therapy. Its essence is to return physiological mobility of the joint or spasmodic muscles through limited tension and subsequent relaxation.
The essence of the method is the isometric tension of the muscle and its subsequent stretching. Tense and shortened muscle with painful nodules is stretched to painless limits and offers the patient to contract it overcoming the doctor’s resistance. A refractory period begins after 5-10 seconds of such tension in the muscles (lack of a protective reaction to mobilization), which allows to increase the mobility amplitude of the particular joint. Such exercises are repeated 4-5 times in a row for one exposure area. The exposure on one zone (for example, the cervical spine) takes from 5 to 10 minutes in one session. The relaxing effect of this painless procedure is often equal to the procaine block of the muscle, its warming and other effects (chlorethylic block).
1st –isometric muscle tension when trying to overcome a patient’s moderate resistance to movement in the opposite direction (carried out when breathing in for 5-10 seconds);
2nd – patient’s muscle relaxation and passive weak stretching in the direction of the longitudinal axis of the muscle when breathing out for 10-20 seconds.
the amplitude and mobility of the joints increase, muscle tone normalizes, pain disappears.