Fig. 1From: The preferable shoulder position can isolate supraspinatus activity superior to the classic empty can test: an electromyographic studyWireless Myon 320 Surface Electromyography System®; Schwarzenberg, Switzerland. The system consists of transmitters (A) and receivers (B). Surface electrode placement on seven muscles identified by different-colored electrodes for the anterior side (C) and posterior side (D)Back to article page