Abstract
Purpose: The purpose of this study was to investigate of muscular activity of triceps brachii muscle during elbow flexor gradually for strength. Methods: Fifteen right handed healthy subjects were recruited in this study (gender:women, age: 20.5±0.9). Right biceps brachii muscle (agonist) and triceps brachii muscle (antagonist) activation were measured by surface electromyography. Subjects performed isometric right elbow flexion from the level of 10% strength of maximum elbow flexion strength (maximum strength) to 80% strength of maximum strength. Since, wecompared muscular activity of 10% strength of maximum strength with each strength for each muscle. Results: Integrated electromyography (IEMG) of agonist is significant increase at equal to or greater than 40% strength of maximum strength. And, IEMG of antagonist is significant increase at equal to or greater than 50% strength of maximum strength. Agonist and antagonist muscular activity is correlated with levels of elbow flexion strength. Conclusion: In present study, the results suggested that agonist is mainly activated for the levels of moderate elbow flexion strength or less. On the other hand, antagonist is activated beyond the levels of moderate elbow flexion strength.
