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KMID : 1142420230210010047
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PNF and Movement
2023 Volume.21 No. 1 p.47 ~ p.52
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Analysis of Onset Time of Muscle Contractions of the Biceps Brachii in Supination According to the Presence or Absence of Elbow Flexor Activity
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Kim Jeong-Wook
Mon Sang-Jae
Park Min-Chull
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Abstract
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Purpose: This study aims to examine the functional difference in the long and short heads of the biceps brachii by investigating the onset time of muscle contractions in the biceps brachii in the supination motion according to whether the flexor of the elbow joint is excluded.
Methods: This study was conducted with 21 healthy men aged in their 20s. While performing forearm pronation at an elbow flexion angle of 90 degrees, the onset time of muscle contractions in the long and short heads of the biceps brachii was measured and compared in a posture where the humerus is placed on a table and the posture is lifted against gravity. Using an independent samples t-test, the difference in the onset time of muscle contractions in the long and short heads of the biceps brachii was analyzed.
Results: The onset time of the long head was shorter if the flexor activity of the elbow joint was excluded, while that of the short head of the biceps brachii was shorter if it was not excluded.
Conclusion: It is noted that the long head of the biceps brachii mainly functions as a supinator muscle, while the short head of the biceps brachii plays a role in stabilizing and maintaining flexion of the elbow joint.
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KEYWORD
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Biceps brachii muscle, Supination, Onset time
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