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http://dx.doi.org/10.21598/JKPNFA.2020.18.1.127

An Analysis of Muscular Activity of the Long and Short Heads of Biceps Brachii Muscle According to the Elbow Flexion Angle  

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)
Publication Information
PNF and Movement / v.18, no.1, 2020 , pp. 127-132 More about this Journal
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.
Keywords
Muscle activity; Biceps brachii; Short head; Long head; Supnation;
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1 Itoi E, Newman SR, Kuechle DK, et al. Dynamic anterior stabiliser of the shoulder with the arm in abduction. The Journal of Bone and Joint Surgery. British volume. 1994;76(5):834-836.
2 Jamison JC, Caldwell GE. Muscle synergies and isometric torque production: influence of supination and pronation level on elbow flexion. Journal of Neurophysiology. 1993;70(3):947-960.   DOI
3 Kido T, Itoi E, Lee SB, Neale PG, et al. Dynamic stabilizing function of the deltoid muscle in shoulders with anterior instability. The American Journal of Sports Medicine. 2003;31(3):399-403.   DOI
4 Kim TW. The analysis of muscle activation about wrist joint flexion & extension during elbow joint extension movement. Han-Yang University. Dissertation of Doctorate Degree. 2010.
5 Lehmkuhl LD, Smith LK. Brunnstrom's clinical kinesiology, 4th ed. Philadelphia. FA Davis.1983.
6 Neumann DA. Kinegiology of the musculoskeletal system: foundations for rehabilitation, 2th ed. Seoul. Beommoon-education. 2011.
7 Pagnani MJ, Deng XH, Warren RF, et al. Role of the long head of the biceps brachii in glenohumeral stability: a biomechanical study in cavavera. Journal of Shoulder and Elbow Surgery. 1996;5(4):255-262.   DOI
8 Poppen NK, Walker PS. Foreces at the glenohumeral joint in abduction. Clinical Orthopaedics and Related Research. 1978;(135):165-170.
9 Xue Q, Huang G. Dynamic stability of glenohumeral joint during scapular plane elevation. Chinese Medical Journal. 1998;115(5):447-449.
10 Athwal GS, Steinmann SP, Rispoli DM. The distal biceps tendon: footprint and relevant clinical anatomy. The Journal of Hand Surgery. 2007;32(8):1225-1229.   DOI
11 Brown JM, Solomon C, Paton M. Further evidence of functional differentiation within biceps brachii. Electromyography Clin Neurophysiology Journal. 1993;33(5):301-309.
12 Howard JD. Relative activation of two human elbow flexor under isometric condition. Experimental Brain Research. 1986;62(1):199-202.   DOI
13 Choi HN, Kwak CS, Lee DH. A quantitative analysis of the activation pattern of elbow flexors using autoregressive model. The Korean Journal of Physical Education. 1996;35(4):299-308.
14 Eames MH, Bain GI, Fogg QA, et al. Distal biceps tendon anatomy: a cadaveric study. The Journal of Bone & Joint Surgery. 2007;89(5):1044-1049.   DOI
15 Hermens HJ, Freriks B, Disselhorst-Klug C, et al. Development of recommendations for SEMG sensors and sensor placement procedures. Journal of Electromyography and Kinesiology. 2000;10(5):361-374.   DOI