Muscle activation of selected shoulder muscles during unilateral wall and bench press tasks under submaximal isometric effort
journal of orthopaedic & sports physical therapy, 2011•jospt.org
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, thus providing relative quantification of muscular isometric effort for these
muscles across the CKC exercises, which may be applied to rehabilitation protocols for
individuals with shoulder weakness. Background CKC exercises favor joint congruence,
reduce shear load, and promote joint dynamic stability. Additionally, knowledge about …
muscles under 2 closed kinetic chain (CKC) tasks for the upper extremity using submaximal
isometric effort, thus providing relative quantification of muscular isometric effort for these
muscles across the CKC exercises, which may be applied to rehabilitation protocols for
individuals with shoulder weakness. Background CKC exercises favor joint congruence,
reduce shear load, and promote joint dynamic stability. Additionally, knowledge about …
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, thus providing relative quantification of muscular isometric effort for these muscles across the CKC exercises, which may be applied to rehabilitation protocols for individuals with shoulder weakness.
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 across 7 shoulder muscles in 20 healthy males, during the performance of a submaximal isometric wall press and bench press. Signals were normalized to the maximal voluntary isometric contraction, and, using paired t tests, data were analyzed between the exercises for each muscle.
Results
Compared to the wall press, the bench press elicited higher activity for most muscles, except for the upper trapezius. Levels of activity were usually low but were above 20% maximal voluntary isometric contraction 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, led to relatively low EMG activation levels for the muscles measured and may be considered for use in the early phases of rehabilitation. J Orthop Sports Phys Ther 2011;41(7):520–525, Epub 2 February 2011. doi:10.2519/jospt.2011.3418
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