About Muscle Energy Technique (MET)

Muscle Energy Technique describes stretching techniques used to strengthen or break down fibrous adhesions and has origins in Physiotherapy and Osteopathy. MET involves manual resistance (of an isometric or isotonic dynamic) followed by a stretch.

Dysfunctions of the musculoskeletal system nearly always involve some type of muscle imbalance which results in some muscles being weak and others being strong, some muscles are being constantly lengthened while others remain in a shortened position. Sports Therapists use two techniques to restore normal function to a dysfunctional muscle; Post Isometric Relaxation (PIR) and Reciprocal Inhibition (RI). 
 
Post Isometric Relaxation (PIR)

Using PIR the therapist increases the range of movement (ROM) through supported stretches for between 7-10 seconds and repeats this 2-3 times.

PIR is used when there is no damage to the muscle, damage would make it painful to stretch in this way. This kind of stretching would never be used during the acute stage of soft tissue injury (24/48 hours). The technique may be used to lengthen tight muscles before strengthening opposing muscles.
 
Reciprocal Inhibition (RI)

RI is a similar technique to MET but involves contraction of the muscle to induce relaxation, one muscle relaxes when the opposing muscle contracts. RI is performed in the same way is PIR contracting the muscle instead of stretching it. RI should not be used if it induces cramp or spasm in the muscle. RI can be used in the more acute stages of soft tissue repair.

RI is useful to help release tension in muscles that are too tight for deep massage techniques, the patient contracts opposing muscles so the tissues being treated are relaxed and softened.