Muscle Energy Technique (MET)
Comprehensive OMT reference hub, interactive cheat sheets, and board review notes for COMLEX Level 1, 2-CE, and 3.
Key Takeaway
Muscle Energy Technique (MET) is a DIRECT, ACTIVE treatment modality. The physician positions the patient precisely at the RESTRICTIVE BARRIER in 3 planes. The patient contracts TOWARD THE FREEDOM (away from the barrier) against an equal, unyielding counterforce for 3 to 5 seconds. During the 1–2 second post-isometric refractory period, the physician passively advances the joint to the NEW restrictive barrier.
Physiology: PIR vs. Reciprocal Inhibition
Developed by Fred Mitchell, Sr., DO, MET utilizes voluntary patient muscle contractions to restore articular motion and lengthen shortened muscles. The two primary physiological mechanisms are Post-Isometric Relaxation (PIR) and Reciprocal Inhibition (RI).
| Physiological Mechanism | Neural Pathway & Receptor | Clinical Setup & Indication |
|---|---|---|
| Post-Isometric Relaxation (PIR) | Golgi Tendon Organ (GTO) fires Ib afferents -> inhibits alpha motor neuron -> refractory relaxation. | Agonist (hypertonic target muscle) contracts against equal force. Used in subacute & chronic muscle spasm. |
| Reciprocal Inhibition (RI) | Muscle Spindle Ia afferents fire -> activate Ia inhibitory interneurons -> relaxes opposing antagonist. | Antagonist muscle contracts against equal force. Used in ACUTE severe pain/spasm when contracting agonist is too painful. |
Standard 5-Step MET Protocol
- Step 1: Position the affected segment precisely at the RESTRICTIVE BARRIER across all 3 planes of motion (Flexion/Extension, Sidebending, Rotation).
- Step 2: Instruct the patient to exert a light, gentle force (approx. 20–30% of maximum effort) TOWARD THE FREEDOM (away from the barrier) against an equal, unyielding physician counterforce.
- Step 3: Hold the isometric contraction for 3 to 5 SECONDS while maintaining strict position.
- Step 4: Instruct the patient to completely relax ('stop pushing') and wait 1 to 2 SECONDS for the post-isometric refractory period.
- Step 5: Passively take up the slack by advancing the segment to the NEW RESTRICTIVE BARRIER in all 3 planes. Repeat 3 to 5 times, then re-evaluate.
Master MET Clinical Setups Matrix
| Dysfunction Type | Key Muscle / Landmark | MET Contraction Vector (Patient Action) |
|---|---|---|
| Exhalation Rib 1 | Anterior & Middle Scalenes | Patient flexes head anteriorly against resistance. |
| Exhalation Rib 2 | Posterior Scalene | Patient turns head 45° away and flexes head against resistance. |
| Exhalation Ribs 3–5 | Pectoralis Minor | Patient pushes elbow toward opposite hip. |
| Exhalation Ribs 6–9 | Serratus Anterior | Patient pushes arm anteriorly across chest against resistance. |
| Exhalation Ribs 10–12 | Latissimus Dorsi / Quadratus Lumborum | Patient adducts arm / elevates hip against resistance. |
| Inhalation Ribs 1–12 | Intercostal Muscles | Patient holds breath in expiration; physician pushes key rib (bottom rib) inferiorly during expiration. |
| Anterior Innominate | Hamstrings (Semitendinosus/Biceps Femoris) | Patient pushes hip into extension against physician force. |
| Posterior Innominate | Quadriceps / Rectus Femoris | Patient flexes hip anteriorly against physician force. |
Common Errors & Contraindications
Common MET Errors: 1. Patient pushes too hard (causes muscle recruitment & joint compression instead of targeted PIR). 2. Contraction duration too short (< 3 sec). 3. Physician fails to wait 1-2 sec post-isometric relaxation before advancing barrier. 4. Physician allows joint movement (becomes isotonic instead of isometric).
Contraindications: Absolute: Severe joint instability, fracture at treatment site, lack of patient cooperation or inability to follow instructions. Relative: Moderate muscle strain, severe osteoporosis, severe pain on contraction.
High-Yield Board Traps & Practice Drills
Q: When treating an Exhalation Rib dysfunction with MET, which rib in the group is targeted?
A: The TOP rib of the group (Key Rib for Exhalation = Top Rib).
Q: When treating an Inhalation Rib dysfunction with MET, which rib in the group is targeted?
A: The BOTTOM rib of the group (Key Rib for Inhalation = Bottom Rib).
Q: In Post-Isometric Relaxation, does the patient contract toward the barrier or toward the freedom?
A: Toward the FREEDOM (away from the restrictive barrier). The physician resists this movement, then advances the segment into the new restrictive barrier.
Source
Based on the publicly available table of contents and topic organization of OMM Review: A Comprehensive Review of Osteopathic Medicine. All notes are original; no copyrighted text, figures, or full source material is included.