Table 1.

Electrode placement

Muscles	Electrode placement (location and orientation)
upper trapezius	50% on the line from the acromion to the spine on vertebra C7, in the direction of the line from the acromion to the spine on vertebra C7
anterior part of deltoid	at one finger width distal and anterior to the acromion, in the direction of the line between the acromion and the thumb
middle part of deltoid	line from the acromion to the lateral epicondyle of the elbow, at the greatest bulge of the muscle, in the direction of the line between the acromion and the hand
posterior part of deltoid	two fingerbreadths behind the angle of the acromion, in the direction of the line between the acromion and the little finger
infraspinatus	approximatively 4 cm below the spine of the scapula, over the infraspinatus fossa on the lateral aspect of the muscle, parallel to the spine of the scapula