In anti-Gravity MMT for Shoulder Horizontal Abduction, what is the test position?

In anti-Gravity MMT for Shoulder Horizontal Abduction, what is the test position?

• A. Prone with the shoulder abducted to 90, elbow flexed, and forearm off the table
• B. Supine with shoulder abducted 90
• C. Standing with arm at side
• D. Seated with arm abducted to 90

Answer: (A)

The test is designed to isolate the posterior shoulder muscles (primarily the posterior deltoid) by placing the arm in a position that best recruits that muscle while keeping the shoulder blade stabilized. Lying prone with the arm abducted to 90 degrees and the elbow flexed to 90 degrees, with the forearm off the table, aligns the posterior deltoid to move the arm in a horizontal plane without other muscles taking over as easily. This setup also stabilizes the scapula and trunk so the movement isn’t aided or masked by compensations, making it clear whether the targeted muscles can produce horizontal abduction against resistance. Other positions tend to allow more compensatory help from other muscles or change the direction of effort, which makes isolation harder and reduces the accuracy of testing the anti-gravity strength of the horizontal abduction mover.

The test is designed to isolate the posterior shoulder muscles (primarily the posterior deltoid) by placing the arm in a position that best recruits that muscle while keeping the shoulder blade stabilized. Lying prone with the arm abducted to 90 degrees and the elbow flexed to 90 degrees, with the forearm off the table, aligns the posterior deltoid to move the arm in a horizontal plane without other muscles taking over as easily. This setup also stabilizes the scapula and trunk so the movement isn’t aided or masked by compensations, making it clear whether the targeted muscles can produce horizontal abduction against resistance. Other positions tend to allow more compensatory help from other muscles or change the direction of effort, which makes isolation harder and reduces the accuracy of testing the anti-gravity strength of the horizontal abduction mover.