TABLE II.

Surface Electromyography Electrode Placement

Muscle	Action	Placement
Anterior deltoid	Internal rotation	1 finger width distal and anterior to the acromion, oriented along the line between the acromion and the thumb23
Pectoralis major	Internal rotation	2 finger widths below the midpoint of the clavicle, oriented along the line between the sternoclavicular joint and the anterior axillary fold24
Latissimus dorsi	Internal rotation	3 finger widths distal to and along the posterior axillary fold, oriented along the line between the posterior axillary fold and L324
Teres major	Internal rotation	3 finger widths above the inferior angle of the scapula, along the lateral border, oriented along the line between the posterior axillary fold and inferior angle24
Infraspinatus	External rotation	2 to 3 finger widths below the scapular spine, at the midpoint between the posterior acromion and the trigonum spinae, oriented parallel to the scapular spine24
Posterior deltoid	External rotation	2 finger widths behind the angle of the acromion, oriented along the line between the acromion and the little finger23