PNF and Movement

Korea Proprioceptive Neuromuscular Facilitation Association (대한고유수용성신경근촉진법학회)
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An Analysis of Muscular Activity of the Long and Short Heads of Biceps Brachii Muscle According to the Elbow Flexion Angle

위팔두갈래근의 긴갈래와 짧은갈래의 팔굽관절 굽힘 각도에 따른 근활성도 분석

  • Kim, Jeong-Wook (Department of Physical Therapy, College of Health Sciences, Graduated School, Catholic University of Pusan) ;
  • Park, Min-Chull (Department of Physical Therapy, College of Health Sciences, Catholic University of Pusan)
  • 김정욱 (부산가톨릭대학교 물리치료학과) ;
  • 박민철 (부산가톨릭대학교 물리치료학과)
  • Received : 2020.02.11
  • Accepted : 2020.03.04
  • Published : 2020.04.30
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Abstract

Purpose: This study aimed to investigate the impact of resistance on the muscle activities of the long and short heads of the biceps brachii, according to the elbow angle in supination, and the difference in muscle activity between the long and the short heads. Methods: This study was conducted with 22 men in their 20s who voluntarily agreed to participate. With the glenohumeral joint neutral in a position of supination, the elbow angle was randomly moved to 0°, 30°, 60°, and 90°. Using an 8-channel surface EMG while the participants held a 2-kg. dumbbell, the muscle activities of the long and the short heads of the biceps brachii were measured. The measured data were statistically processed using SPSS for Windows 12.0. For the activities of the short and the long heads according to the angle, a one-way ANOVA was conducted, and subsequently, to check the results of an analysis of the difference between groups, an LSD post-hoc test was conducted. An independent t-test was used to compare the activities of the long head and the short head according to the angles. Results: The analysis of the impact of the load of the dumbbell at each elbow angle on the muscle activities of the long and short heads of the biceps brachii revealed significant differences in both heads (p < 0.05). The result of the post-hoc analysis showed significant differences in both heads at angles between 0° and 30°, between 0° and 60°, and between 0° and 90°. Analysis of the impact of the load of the dumbbell in supination on the muscle activities of the long and short heads showed a significant difference at the angle between 0° and 30° (p < 0.05). Conclusion: The long head of the biceps brachii mainly acts in supination; however, in supination at elbow-bending angles of 60° and 90°, there was no difference in muscle activity between the short head and the long head.

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References

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