Comparison of Elbow Extensor Muscle Strength and EMG Activity in Supine and Prone Positions in Healthy Subjects

Abstract

Background There is little research on the strength and electromyograph (EMG) activity of elbow extensors according to the measuring posture. Purpose We investigated which posture influenced strength and EMG activity of elbow extensors in evaluating postures (supine and prone). Study design Comparative, repeated measures design. Methods Twenty-one healthy subjects performed maximal elbow extension in two postures (supine and prone). EMG activity was measured in the anconeus, long head of triceps (LoT), and lateral of triceps (LT). When measuring EMG activity of elbow extensors, the strength of elbow extensors was also measured by Smart KEMA strength measurement system. Results In supine, EMG activity of anconeus and LT was significant increased. The other way, EMG activity of LoT and strength of elbow extensors were significant increase in the prone position. Conclusions We recommend the prone position to increase EMG activity of LoT and to improve strength of elbow extensors. In addition, supine position should be considered to increase muscle activity of anconeus and LT.