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KMID : 1142420210190010147
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PNF and Movement
2021 Volume.19 No. 1 p.147 ~ p.152
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An Analysis of Muscular Activity of Supination According to the Elbow Flexion Angle Excluding the Elbow Flexor Activity of the Long and Short Head of the Biceps Brachii Muscle
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Kim Jeong-Wook
Park Min-Chull
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Abstract
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Purpose: This study was conducted to investigate the functional differences of the two heads of the biceps brachii by measuring the functions in supination according to pronation by the angle of the flexion of the elbow joint, except for the activities of the elbow flexors.
Methods: This study was conducted with 25 healthy men in their 20s. At a glenohumeral-joint 0° flexion posture, angles of flexion of the elbow joint of 0°, 30°, 60°, 90°, and 120° were randomly provided, and they were asked to perform supination and pronation with an elastic band. Using an eight-channel surface electromyogram, the muscle activities of the long and short heads of the biceps brachii were measured. The activities of the short and long heads according to the angle were analyzed using a one-way ANOVA, and as a post-test, LSD was employed.
Results: The analysis of the impact of the resistance of the elastic band in supination on the differences in the muscle activities in the short and long heads suggests there was a significant difference between 0° and 30° (p < 0.05).
Conclusion: In supination according to forearm pronation, the long head had greater action in the early flexion posture of the elbow joint, and it is judged that the ratio of the flexion of the elbow joint according to the actions of the biceps brachii was considered small.
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KEYWORD
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Muscle activity, Biceps brachii, Supination
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