Inclusion Criteria:  Those with shoulder pain of recent onset (<3 months) Those with supraspinatus tendonitis only (see exclusion criteria below)  Those whose physical examination meets either criteria below:  Positive impingement tests  At least two of:  Jobe Modified Jobe Hawkins-Kennedy Neer Painful arc: Painful arc at 70-120 degrees abduction and/or Painful arc at 70-120 degrees flexion Pain with resisted abduction and/or external rotation Those between the ages of 18 and 65 Those willing and able to sign consent  Exclusion Criteria:  Those who have had ipsilateral shoulder surgery involving the supraspinatus muscle Those who have experienced a fracture or avulsion fracture of any element of the shoulder or forequarter area (rib cage, clavicle, or humerus) Those with full-thickness rotator cuff tear Those with a long head of biceps rupture Those with shoulder pathology other than SST (ex: glenohumeral joint (GHJ) arthritis, adhesive capsulitis, labral tear). However, ACJ arthritis can be admitted since this is a very common comorbidity.  Those with comorbidities that may confound the outcome, such as:  Diabetes (either type I or type II) Auto-inflammatory diseases Auto-immune diseases Connective tissue disorders (Ehlers Danlos Syndrome) Those with demand type pacemakers Pregnancy