FULL CAN TEST FOR SAPS AND TO ISOLATE THE SUPRASPINATUS MUSCLE? If the empty can test is not able to isolate the supraspinatus, can the full can test do the job then? Again, Boettcher et al. (2009) also examined the EMG activity of 13 muscles in 15 normal subjects and found that the full can test activated 8 other shoulder muscles to the same degree. At the same time, the study of Jain et al. (2017) also evaluated the full can test regarding its ability to detect tears of the supaspinatus. They