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How do you measure muscle length?

How do you measure muscle length?

In summary, there are four steps to assessing muscle length:

  1. Ensure maximal lengthening of the muscle from origin to insertion.
  2. Firmly stabilize one end (usually the origin).
  3. Slowly elongate the muscle.
  4. Assess the end feel.

How does the latissimus dorsi extend the arm?

The latissimus dorsi is considered a muscle of contributing to both thoracic and brachial (i.e. arm) motion. As the muscle fibers extend toward the axilla, the fibers wind around the anterior aspect of the teres major muscle to insert as a flat tendon on the floor of the intertubercular sulcus.

What are the 3 main functions of the latissimus dorsi?

The latissimus dorsi is responsible for extension, adduction, transverse extension also known as horizontal abduction (or horizontal extension), flexion from an extended position, and (medial) internal rotation of the shoulder joint. It also has a synergistic role in extension and lateral flexion of the lumbar spine.

How to test the length of teres major latissimus dorsi?

Starting Position: Supine, with the arms at the sides, elbows extended, knees bent, and low back flat on the table. Test Movement: Subject raises both arms in flexion overhead, keeping the arms close to the head and bringing them down toward the table (maintaining a flat low back).

What kind of flexion does the LAT test show?

The Lat Test evaluates shoulder flexion which includes the flexibility of the latissimus dorsi muscle group, shoulder joint restrictions and scapular motion limitations. The lat muscle spans the entire back and inserts onto the arm.

Where is the insertion of the latissimus dorsi muscle?

It is felt to contract during resisted adduction of the arm. Its insertion lies anteriorly at the crest of the lesser tuberosity. By asking a patient to raise his/her arm to 90% flexion and hold it steady against an upwardly directed pressure, the latissimus dorsi muscle can be made to stand out relative to the thorax.

How does the lat muscle affect spinal posture?

The lat muscle spans the entire back and inserts onto the arm. Tightness in the lat can lead to loss of spinal posture anytime the arms are elevated, such as during the backswing. Also, the lat muscle can limit the ability of the player to rotate their shoulders on the backswing or the follow-through.