PNF and Movement

Korea Proprioceptive Neuromuscular Facilitation Association (대한고유수용성신경근촉진법학회)
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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

팔꿉관절 굽힘 작용 배제 유무에 따른 뒤침 동작시 위팔두갈래근의 근수축 개시시간 분석

  • Jeong-Wook Kim (Department of Physical Therapy, College of Health Sciences, Graduated School, Catholic University of Pusan ) ;
  • Sang-Jae Moon (Department of Physical Therapy, Jinju Gyeongsang National University Hospital ) ;
  • Min-Chull Park (Department of Physical Therapy, College of Health Sciences, Catholic University of Pusan)
  • 김정욱 (부산가톨릭대학교 대학원 물리치료학과) ;
  • 문상재 (진주경상대학교병원 재활치료실) ;
  • 박민철 (부산가톨릭대학교 물리치료학과)
  • Received : 2022.12.29
  • Accepted : 2023.02.13
  • Published : 2023.04.30
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Abstract

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.

Keywords

Acknowledgement

This research was supported by Cathoric University of Pusan Research Grants in 2021.

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