How to use Post Isometric Relaxation Post Isometric Relaxation (PIR) is a technique used to relax and lengthen a hypertonic and shortened muscle. PIR cooperates with a muscle’s neural feedback system to accomplish a specific relaxation result on purpose. For example, a hypertonic upper trapezius muscle may restrict range of motion in the shoulder, head and neck. By using PIR a therapist can relax and lengthen the muscle to increase passive and active range of motion and decrease pain. The steps involved in PIR are:
- Identify the target muscle to relax and lengthen
- Identify the target muscle’s primary action
- Contract the muscle isometrically using resisted motion for 6 to 10 seconds
- Stop the contraction and have the client breathe
- On exhalation of the breath, passively move the muscle in the opposite direction
- Gently lengthen the muscle to a new barrier of tissue resistance
- Hold at the new barrier for 2 to 3 seconds
- Release the new barrier by backing off slightly
- From this new position of ease, just off the new barrier of resistance, repeat steps 1 to 8
- Repeat 3 to 6 times to accomplish desired result
- All PIR steps can and should be performed pain free