Korean Journal of Applied Biomechanics (한국운동역학회지)

Korean Society of Applied Biomechanics (한국운동역학회)
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The Comparison of Electromyographic Ratio of Serratus Anterior and Upper Trapezius According to Exercise Position and Shoulder Flexion Angle during Scapular Protraction Exercises

어깨뼈 내밈 운동 시 운동 자세와 어깨관절 굽힘각도에 따른 앞 톱니근과 위 등세모근의 근 활성도 비의 비교

  • Koh, Eun-Kyung (Department of Physical Therapy, Masan University) ;
  • Weon, Jong-Hyuck (Department of Physical Therapy, College of Tourism & Health, Joongbu University) ;
  • Jung, Do-Young (Department of Physical Therapy, College of Tourism & Health, Joongbu University)
  • 고은경 (마산대학교 물리치료과) ;
  • 원종혁 (중부대학교 관광보건대학 물리치료학과) ;
  • 정도영 (중부대학교 관광보건대학 물리치료학과)
  • Received : 2012.04.30
  • Accepted : 2012.06.22
  • Published : 2012.06.30
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Abstract

The purpose of this study was to investigate the activities of the serratus anterior (SA) and upper trapezius (UT) muscles during scapular protraction exercise with a dumbbell. Twenty-one healthy subjects with no medial history of shoulder pain or upper extremity disorders were recruited for this study. Subjects performed scapular protraction at $90^{\circ}$ and $130^{\circ}$ shoulder flexion with a dumbbell in supine and standing positions. The activities of the SA and UT were measured via surface electromyography (EMG) during 4 scapular protraction exercises. A 2 (angle) ${\times}$ 2 (position) repeated-measures analysis of variance (ANOVA) was used to compare the normalized activities of the SA and UT and the UT/SA ratio. The results showed that activities of both the SA and UT were the highest for the scapular protraction exercise at $130^{\circ}$ shoulder flexion in the standing position. However, the UT/SA ratio was the lowest for the exercise at $90^{\circ}$ shoulder flexion in supine position. Therefore, for selective activation of the SA muscle, we recommend performing the scapular protraction exercise with a dumbbell in the supine position at $90^{\circ}$ shoulder flexion.

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References

  1. Bagg, S. D., & Forrest, W. J.(1988). A biomechanical analysis of scapular rotation during arm abduction in the scapular plane. The American Journal of Sports Medicine, 67(6), 238-245.
  2. Cools, A. M., Witvrouw, E. E., Declercq, G., Vanderstraeten, G., & Cambier, D.(2004). Evaluation of isokinetic force production and associated muscle activity in the scapular rotators during a production-retraction movement in overhead athletes with impingement syndromes. The British Journal of Sports Medicine, 38, 64-68. https://doi.org/10.1136/bjsm.2003.004952
  3. Cools, A. M., Witvrouw, E. E., Mahieu, N. N., & Danneels, L. A.(2005). Isokinetic scapular muscle performance in overhead athletes with and without impingement symptoms. Journal of Athletic Training, 40(2), 104-110.
  4. Cools, A. M., Dewitte, V., Lanszweert, F., Notebaert, D., Roets, A., Soetens, B., Cagnie, B., & Witvrouw, E. E.(2007). Rehabilitation of scapular muscle balance: which exercises to prescribe?. The American Journal of Sports Medicine, 35(10), 1744-1751. https://doi.org/10.1177/0363546507303560
  5. Cram, J. R., Kasman, G. S., & Holtz, J.(1998). Introduction to surface electromyography. Gaithersburg: Apsen.
  6. Decker, M. J., Hintermeister, R. A., Faber, K. J., & Hawkins, R. J.(1999). Serratus anterior muscle activity during selected rehabilitation exercises. The American Journal of Sports Medicine, 27(6), 784-791.
  7. Ekstrom, R. A., Donatelli, R. A., & Soderberg, G. L.(2003). Surface electromyographic analysis of exercises for the trapezius and serratus anterior muscle. The Journal of Orthopaedic & Sports Physical Therapy, 33(5), 247-258. https://doi.org/10.2519/jospt.2003.33.5.247
  8. Glousman, R., Jobe, F., Tibone, J., Moynes D., Antonelli D., & Perry J.(1988). Dynamic electromyographic analysis of the throwing shoulder with glenohumeral instability. Journal of Bone & Joint Surgery, 70(2), 220-226.
  9. Inman, V. T., Saunders, J. B., & Abbott, L. C.(1996). Observations of the function of the shoulder joint. 1944. Clinical Orthopaedics & Related Research, 330, 3-12. https://doi.org/10.1097/00003086-199609000-00002
  10. Kamkar, A., Irrgang, J. J., & Whitney, S. L.(1993). Nonoperative management of secondary shoulder impingement syndrome. The Journal of Orthopaedic & Sports Physical Therapy, 17(5), 212-224. https://doi.org/10.2519/jospt.1993.17.5.212
  11. Kendall, F. P., McCreary E. K., Provance, P. G., Rodgers, M. M., & Romani, W. A.(2005). Muscle: Testing & function, with posture and pain. 5th edition. Baltimore: Williams and Wilkins.
  12. Lear, L. J., & Gross, M. T.(1998). An electromyographical analysis of the scapular stabilizing synergists during a push-up progression. The Journal of Orthopaedic & Sports Physical Therapy, 28(3), 146-157. https://doi.org/10.2519/jospt.1998.28.3.146
  13. Levangie, P., & Norkin, C.(2011). Joint structure and function: A comprehensive analysis. 5th edition. Philadelphia: F. A. Davis Company.
  14. Liu, J., Hughes, R. E., Smutz, W. P., Niebur, G., & Nan-An, K.(1997). Roles of deltoid and rotator cuff muscles in shoulder elevation. Clinical Biomechanics, 12(1), 32-38. https://doi.org/10.1016/S0268-0033(96)00047-2
  15. Ludewig, P. M., Cook, T. M., & Nawoczenski, D. A.(1996). Three-dimensional scapular orientation and muscle activity at selected positions of humeral elevation. The Journal of Orthopaedic & Sports Physical Therapy, 24(2), 57-65. https://doi.org/10.2519/jospt.1996.24.2.57
  16. Ludewig, P. M., & Cook, T. M.(2000). Alterations in shoulder kinematics and associated muscle activity in people with symptoms of shoulder impingement. Physical Therapy, 80(3), 276-291.
  17. Ludewig, P. M., Hoff, M. S., Osowski, E. E., Meschke, S. A., & Rundquist, P. J.(2004). Relative balance of serratus anterior and upper trapezius muscle activity during push-up exercises. The American Journal of Sports Medicine, 32(2), 484-493. https://doi.org/10.1177/0363546503258911
  18. Lukasiewicz, A. C., McClure, P., Michener, L., Pratt, N., & Sennett, B.(1999). Comparison of 3-dimensional scapular position and orientation between subjects with and without shoulder impingement. The American Journal of Sports Medicine, 29(10), 574-583.
  19. Martins, J., Tucci, H. T., Andrade, R., Araújo, R. C., Bevilaqua-Grossi, D., & Oliveira, A. S.(2008). Electromyographic amplitude ratio of serratus anterior and upper trapezius muscles during modified push-ups and bench press exercises. The Journal of Strength & Conditioning Research, 22(2), 477-484. https://doi.org/10.1519/JSC.0b013e3181660748
  20. McClure, P. W., Bialker, J., Neff, N., Williams, G., & Karduna, A.(2004). Shoulder function and 3-dimensional kinematics in people with shoulder impingement syndrome before and after a 6-week exercise program. Physical Therapy, 84(9), 832-848.
  21. Moseley, J. B., Jobe, F. W., Pink, M., Perry, J., & Tibone, J. (1992). EMG analysis of the scapular muscles during a shoulder rehabilitation program. The American Journal of Sports Medicine, 20(2), 128-134. https://doi.org/10.1177/036354659202000206
  22. Scovazzo, M. L., Browne, A., Pink, M., Jobe, F. W., & Kerrigan J.(1991). The painful shoulder during freestyle swimming. An electromyographic cinematographic analysis of twelve muscles. The American Journal of Sports Medicine, 19(6), 577-582. https://doi.org/10.1177/036354659101900604