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The anconeus and triceps brachii are primary extensors of the elbow.1 The anconeus extends from the olecranon to the dorsolateral part of the lateral epicondyle.2 The main action of the anconeus is accessory extension of the elbow.3 This muscle also acts as a stabilizer for the elbow joint during supination and pronation.4 The triceps brachii is a threeheaded muscle (long, lateral, and medial).5 The long head (LoT) is attached to the olecranon from the infraglenoid tubercle of the scapula.1 Therefore, the LoT serves to extend and adduct the shoulder and extend the elbow.6,7 The medial and lateral heads (LT) originate from the posterolateral aspect of the humerus, and their main function is elbow extension with the LoT.1,7 In clinical, the elbow extensors are strengthened to increase the ability of spinal cord injury patients in a push wheelchair to transfer from one place to another and to reach objects during activities of daily living.8 Athletic trainers’ use several exercises to strengthen the elbow flexors and extensors for elbow balance. Strengthening the triceps is especially important in cross-country sports to improve high propulsion force.9 However, activities that increase muscle strength during elbow extension by shoulder posture remain to be investigated. Two positions are generally adopted to measure the Comparison of Elbow Extensor Muscle Strength and EMG Activity in Supine and Prone Positions in Healthy Subjects