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An investigation into EMG activity in the upper and lower portions of the subscapularis muscle during normal shoulder motion by Neil E O'Connell; Joseph Cowan; Tony Christopher is a Medicine article available to read on EtoBox.

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## Abstract **Background and Purpose**. The subscapularis (SSc) muscle is considered to perform a variety of roles during normal shoulder movement. The SSc is innervated by two or more discrete motor nerves and previous studies have indicated some difference in electromyographic (EMG) activity between the upper and lower portions of the muscle. The purpose of the present study was to compare EMG activity between the upper and lower portions of the SSc muscle during voluntary shoulder movements in normal healthy subjects. **Method**. Eight subjects were evaluated. A pair of intramuscular electrodes was inserted into each portion of the muscle. EMG data were recorded during the following movements: sagittal flexion; abduction in the coronal plane; and abduction in the scapular plane. **Results**. EMG onset of the upper portion of subscapularis occurred significantly earlier compared to the lower portion. Differences were also seen in the level and pattern of activation between the two portions, with upper SSc demonstrating higher levels of activation than the lower portion. **Conclusions**. These findings suggest that the upper and lower portions of SSc are differentially active duri

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Author

Neil E O'Connell; Joseph Cowan; Tony Christopher

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); Wiley-Blackwell; Wiley; Research Square (ISSN 1358-2267)

Published

2006

Language

EN

Field

Medicine (Health Sciences)