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Pectoralis minor is a major player when it comes to bad posture, subacromial impingement and neurogenic thoracic outlet. Some believe that pectoral overactivity results from prolonged (flexion-addicted) sitting or working with arms out in front of the body. I tend to agree, but also feel that much of the chest wall tightness therapists palpate results from CNS protective guarding and reflex spasm due to tension, nerve compression, altered joint neurology, and athletic overuse syndromes.

Nerve compression from joint alteration anywhere along the brachial plexus’ course may cause the brain to reflexively “splint” anterior chest wall tissues in an attempt to prevent further perceived neural insult. Accompanying dural membrane irritation can set the stage for pain-spasm-pain cycles or, in the early stages, the client may only experience symptoms such as shortness of breath, emotional distress, and restricted glenohumeral mobility …with no pain at all.

During the standing evaluation, pay particular attention to humeral positioning and scapular winging. A tight protectively guarded pec minor can reflexively inhibit serratus anterior causing the glenoid fossa to become more vertically aligned. This results in internal humeral head rotation and increased risk of rotator cuff impingement. Further, the protracted shoulder girdle causes increased activation of the levator scapula and upper trapezius in an effort to maintain glenohumeral stability. The typical end result is neck and t-spine stiffness seen in so many desk jockeys and overhead racket athletes.

Also assess using the “Floor Angel” position with client lying supine, humerus abducted and elbows flexed to 90 degrees (Fig 1). Ask the client to externally rotate his arms and slowly extend over his head. Tight pecs will not allow the client’s shoulders to lie flat against the therapy table during this maneuver, and they may experience anterior glenohumeral pain. To reduce the pain and relax the overactive chest wall musculature, I use Pain Exposure Techniques. The goal of PET is to try and get the client’s brain to associate slow, precise graded exposure stretching movements with security instead of pain.

The controlled manipulation of pectoral tissue combined with facilitated movement can provide safety from stretching too far. Using muscle energy and pin-and-twist maneuvers, the client is encouraged to gradually push the stretch discomfort barrier a bit further. By progressively introducing graded exposure stretch to areas that have been problematic in the past, the nervous system begins associating the new movement with safety instead of pain. Over a series of sessions, I’ve noticed a marked decrease in protective pectoral muscle guarding and an increase in pain tolerance during joint stretching maneuvers. In touch, Erik

Bilateral elbow pec minor release

GOAL: Create brachial plexus space

LANDMARK: Chest Wall

ACTION: Bilateral elbow pec release

  • Therapist’s elbows hook pec fascia and move tissue laterally to open up front line
  • With client’s arms abducted to 135º, she begins externally and internally rotating her arms

Repeat 2-3 minutes and assess for improved shoulder rotation

Unilateral elbow pec minor release

ACTION:

  • Therapist grasps client’s left wrist and begins internally and externally rotating client’s right arm
  • Therapist’s forearm contacts the pec minor muscle at the corcoid process and resists external arm rotation

Repeat for 2 -3 minutes and reassess for improved soft tissue mobility