אימונים Muscle Activation of Selected Shoulder Muscles During Unilateral Wall Bench Press Tas

[Mike Bikov]

J Orthop Sports Phys Ther. 2011 Feb 2. [Epub ahead of print]
Muscle Activation of Selected Shoulder Muscles During Unilateral Wall Bench Press Tasks Under Submaximal Isometric Effort.

Tucci HT, Ciol MA, Araã Jo RC, de Andrade R, Martins J, McQuade KJ, Oliveira AS.
Abstract

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STUDY DESIGN: Controlled laboratory study.

OBJECTIVE: To assess the activation of 7 shoulder muscles under 2 closed kinetic chain (CKC) tasks for the upper extremity using submaximal isometric effort; to provide a relative quantification of muscular isometric effort for those muscles across the exercises; and to use those findings within the context of relative efforts in order to design rehabilitation protocols for individuals with shoulder weaknesses.

BACKGROUND: CKC exercises favor joint congruence, reduce shear load, and promote joint dynamic stability. Additionally, knowledge about glenohumeral and periscapular muscle activity elicited during CKC exercises may help clinicians to design protocols for shoulder rehabilitation.

METHODS: Using surface electromyography, activation level was measured for 7 shoulder muscles in 20 healthy males during the performance of submaximal isometric wall press and bench press. Signals were normalized by the maximal voluntary isometric contraction (MVIC) and data were analyzed using paired t-tests between the exercises for each muscle.

RESULTS: Compared to wall press, bench press elicited higher activity for most muscles, except for upper trapezius. Level of activity were usually low, but were above 20% MVIC for the serratus anterior on both tasks, and for the long head triceps brachii on the bench press.

CONCLUSIONS: Both the bench press and wall press as performed in this study lead to relatively low EMG activation level for the muscles measured and might be considered in early phases of rehabilitation. J Orthop Sports Phys Ther, Epub 2 February 2011. doi:10.2519/jospt.2011.3418.​

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