ACTIVITY OF SCAPULAR MUSCLES: COMPARISON OF OPEN AND CLOSED KINETIC CHAIN EXERCISES
DOI:
https://doi.org/10.17770/sie2017vol3.2422Keywords:
exercises, muscle activity, motor control, scapula, stabilityAbstract
The function of the shoulder region and cervical spine are regulated by the motor control of the scapula. It is important to selectively activate weak muscles and minimally involve tense muscles to improve scapular motor control. The objective of this study was to compare the activity of scapular muscles and the intramuscular balance during various open and closed kinetic chain exercises. Methods: This study included 20 female sedentary office workers. A surface electromyography was used to analyze the activity of the scapular muscle in the correct exercise starting position and during 6 different exercises. Additionally, the optimal intramuscular balance was examined. Results and conclusions: Open kinetic chain exercises is more suitable than closed kinetic chain exercises for training scapular active stability. Horizontal shoulder abduction with external rotation (scapula retraction and internal rotation) while in the prone position was optimal and could be recommended (as well as its modifications with a resistance band) for training programs to improve scapula active stability.Downloads
References
Cools, A.M., Declercq, G.A., Cambier, D.C., Mahieu, N.N., Witvrouw E.E. (2007). Trapezius activity and intramuscular balance during isokinetic exercise in overhead athletes with impingement symptoms. Scand J Med Sci Sports, 17, 25–33
De Mey, K., Cagnie, B., Danneels, L.A., Cools, A.M., Van de Velde A. (2009). Trapezius muscle timing during selected shoulder rehabilitation exercises. J Orthop Sports Phys Ther, 39, 743 –52
De Mey, K., Danneels, L., Cagnie, B., Borms, D., TʼJonck, Z., Van Damme, E., Cools A.M. (2014). Shoulder muscle activation levels during four closed kinetic chain exercises with and without Redcord slings. J Strength Cond Res, 28(6), 1626-35
De Mey, K., Danneels, L., Cagnie, B., Van den Bosch, L., Flier, J., Cools A.M. (2013). Kinetic chain influences on upper and lower trapezius muscle activation during eight variations of a scapular retraction exercise in overhead athletes. J Sci Med Sport,16, 65–70
Gaffney, B.M., Maluf, K.S., Curran-Everett, D., Davidson B.S. (2014). Associations between cervical and scapular posture and the spatial distribution of trapezius muscle activity. J Electromyogr Kinesiol, 24(4), 542-9.
Kalantari, K.K., Ardestani B.S. (2014). The effect of base of support stability on shoulder muscle activity during closed kinematic chain exercises. Journal of Bodywork and Movement Therapies, 18(2), 233-8.
Kendall, F.P., McCreary, E.K., Provance, P.G. (1993). Muscles testing and function. Williams and Wilkins. Baltimore.
Kisner, C., Colby L.A. (2007). Therapeutic exercise: Foundations and Techniques. Philadelphia: Davis Company.
Park, S.Y., Yoo W.G. (2013). Effect of sustained typing work on changes in scapular position, pressure pain sensitivity and upper trapezius activity. J Occup Health, 55(3), 167-72.
Ratcliffe, E., Pickering, S., McLean, S., Lewis J. (2014). Is there a relationship between subacromial impingement syndrome and scapular orientation? A systematic review. Br J Sports Med, 48(16), 1251-6.
Sella G.E. (2000). Guidelines for neuromuscular re-education with sEMG biofeedback. Volume I. GENMED Publishing, Martins Ferry, OH, USA.
Timmons, M.K., Thigpen, C.A., Seitz, A.L., Karduna, A.R., Arnold, B.L., Michener L.A. (2012). Scapular kinematics and subacromial-impingement syndrome: a meta-analysis. J Sport Rehabili, 21(4), 354-70.
