Effects of horizontal shoulder abduction and adduction on the activity and strength of the scapular protractors |
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| Institution: | 1. R & D Department, Biomechanical Unit, Podoactiva Headquarters, Cuarte de Huesca, Spain;2. Family Medicine Chair, Clinical Medicine Department, Miguel Hernandez University, San Juan de Alicante, Spain;1. Human Health Sciences, Graduate School of Medicine, Kyoto University, Kyoto, Japan;2. Rehabilitation Unit, Kyoto University Hospital, Kyoto, Japan;3. Institute for Human Movement and Medical Sciences, Niigata University of Health and Welfare, Niigata, Japan;4. Rehabilitation Group, Department of Medical Technique, Nagoya University, Nagoya, Japan;5. Department of Rehabilitation, Sapporo Tokushukai Hospital, Sapporo, Japan |
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| Abstract: | Increased activity of the serratus anterior (SA) muscle combined with decreased activity of the pectoralis major (PM) muscle during scapular protraction exercise is a widely used method for selective strengthening of the former muscle. However, the role played by the PM during maximal scapular protraction remains unclear. The objective of our study was to investigate the effects of horizontal shoulder abduction (decreasing PM activity) and adduction (increasing activity) on the strength and activity of the scapular protractors (the SA and PM) during maximal protraction. Twenty-nine healthy males performed maximal scapular protraction combined with horizontal shoulder abduction or adduction. The strength and activity of the PM and SA decreased significantly (both p < 0.01) during maximal scapular protraction combined with horizontal shoulder abduction, compared with maximal scapular protraction alone, but increased significantly (both p < 0.01) when maximal scapular protraction was combined with horizontal shoulder adduction. We thus conclude that the PM stabilizes the activated SA during maximal scapular protraction, which effectively increases SA activity and scapular protraction strength in the serratus punch posture. |
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| Keywords: | Scapular protraction Strength Pectoralis major Serratus anterior |
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