An investigation into EMG activity in the upper and lower portions of the subscapularis muscle during normal shoulder motion

Neil E O'Connell, Joseph Cowan, Tony Christopher

The purpose of the study was to compare EMG activity between the upper and lower portions of the suscapularis muscle during voluntary shoulder movements in normal healthy subjects.  The results show that 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 subscapularis demonstrating higher levels of activation than the lower portion. The authors conclude that these findings suggest that the upper and lower portions of subscapularis are differentially active during voluntary shoulder movements.

Physiotherapy Research International, Volume 11, Issue 3, Pages 148 – 151

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