A Comparison of EMG Activity for Long and Lateral Heads of Triceps Brachii Muscles According to Exercise and Forearm Positions During Triceps Strengthening Exercises

삼두근 근력 운동 시 운동 자세와 전완 자세에 따른 삼두근 장두와 외측두의 근 활성도 비교

  • Kim, Si-Hyun (Dept of Rehabilitation Therapy, The Graduate School, Yonsei University) ;
  • Lee, Won-Hwee (Dept of Rehabilitation Therapy, The Graduate School, Yonsei University) ;
  • Ha, Sung-Min (Dept of Rehabilitation Therapy, The Graduate School, Yonsei University) ;
  • Park, Kyue-Nam (Dept of Rehabilitation Therapy, The Graduate School, Yonsei University) ;
  • Kwon, Oh-Yun (Dept of Physical Therapy, College of Health Science, Yonsei University, Dept. of Ergonomic Therapy, The Graduate School of Health and Environment, Yonsei University)
  • 김시현 (연세대학교 대학원 재활학과) ;
  • 이원휘 (연세대학교 대학원 재활학과) ;
  • 하성민 (연세대학교 대학원 재활학과) ;
  • 박규남 (연세대학교 대학원 재활학과) ;
  • 권오윤 (연세대학교 보건과학대학 물리치료학과, 보건환경대학원 인간공학치료학과)
  • Received : 2010.12.20
  • Accepted : 2011.01.25
  • Published : 2011.02.19


The aim of this study was to compare electromyography activity for long and lateral heads of triceps brachii muscle according to forearm positions during different triceps strengthening exercises. The muscle activities for long and lateral head of triceps brachii were measured by surface electromyography. Fifteen healthy volunteers participated for this study and performed elbow extension in three different elbow extension exercises (elbow extension in a supine position; EES, elbow extension with shoulder abduction at 90 degrees in a prone position; EESA, and elbow extension with one arm at the side of the trunk in a prone position; EESP) and forearm positions (supination, neutral, and pronation). A two-way repeated measures ANOVA was used to compare the effects of the exercise positions and forearm positions. The EMG activities of the long head of the triceps brachii increased significantly during EESP with forearm supination, whereas the activity of the lateral head of the triceps brachii increased significantly during EESA with the forearm in a neutral position (p<.05). The results of this study suggest that exercise positions and forearm positions should be considered for selectively strengthening the long and lateral heads of triceps brachii muscles.



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