EXTRA CREDIT:  Your patient is in the standard testing posit…

EXTRA CREDIT:  Your patient is in the standard testing position for goniometric measurement (ROM) for shoulder internal and external rotation.  The patient starts with the shoulder in neutral rotation, and in order to test the external rotation range of motion, you ask them to externally rotate.  When you demonstrate the motion that you want them to do, you keep your wrist in neutral the entire time. As the patient moves the shoulder into the requested position, what type of muscle contraction is occurring in the wrist flexors?