RESISTED ISOMETRIC TESTING IN THE SHOULDER To get a quick idea about the strength of different muscles in different directions of movement and to detect possible weakness, you can perform resisted isometric testing. You can either use the make (hold, like we did it in the video) or break method (break the patients resistance). While strength testing especially in the ranges of MRC 4-5 is very unreliable, pain provocation can give you valuable information. The most common reason to use resisted i