Each joint action, with the role and emphasis the graph assigns each muscle. These are qualitative anatomical labels, not measured muscle activation.
Shoulder adductionprimary action
Latissimus dorsi (prime mover, high emphasis); Teres major (prime mover, high emphasis); Posterior deltoid (synergist, moderate emphasis); Pectoralis major (synergist, low emphasis)
Shoulder extensionprimary action
Latissimus dorsi (prime mover, high emphasis); Teres major (prime mover, moderate emphasis); Posterior deltoid (synergist, moderate emphasis)
Elbow flexionsecondary action
Brachialis (prime mover, high emphasis); Brachioradialis (prime mover, moderate emphasis); Biceps brachii (prime mover, moderate emphasis)
Scapula depressionsecondary action
Trapezius (prime mover, moderate emphasis); Pectoralis minor (synergist, low emphasis)
Scapula downward rotationsecondary action
Rhomboids (synergist, low emphasis); Pectoralis minor (synergist, low emphasis); Trapezius (synergist, low emphasis)