{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,1]],"date-time":"2026-08-01T07:57:26Z","timestamp":1785571046970,"version":"3.56.0"},"reference-count":34,"publisher":"Journal of Orthopaedic & Sports Physical Therapy (JOSPT)","issue":"8","content-domain":{"domain":["www.jospt.org"],"crossmark-restriction":true},"short-container-title":["Journal of Orthopaedic &amp; Sports Physical Therapy"],"published-print":{"date-parts":[[2026,8]]},"abstract":"<jats:p>OBJECTIVE: To determine the trajectory of (1) change in pain-related fear and catastrophizing factors, (2) changes in pain-related fear and catastrophizing by treatment satisfaction groups, and (3) the relationship between pain-related fear trajectories, and catastrophizing factors and shoulder disability during an 8-week resistance exercise program.<\/jats:p>\n                  <jats:p>DESIGN: Prospective longitudinal observational study.<\/jats:p>\n                  <jats:p>METHODS: Sixty-four people with rotator cuff tendinopathy completed the exercise protocol. Outcomes of Penn Shoulder Score (Penn) shoulder disability and pain-related fear and catastrophizing via the Optimal Screening for Prediction of Referral and Outcome-Yellow Flag (OSPRO-YF) were assessed at baseline and at 2, 4, and 8 weeks. Patient Acceptable Symptom State (PASS) defined satisfaction with treatment at 8 weeks.<\/jats:p>\n                  <jats:p>RESULTS: All pain-related fear and catastrophizing measures changed over time during resistance exercise ( P &lt; .01) but differed by PASS-defined responder and nonresponder groups. For the Fear-Avoidance Beliefs Questionnaire\u2013Work subscale (FABQ-W), nonresponders had an increase (0.63 pt) while responders had a decrease (\u22123.5 pt) (mean difference, 4.2 pt; 95% confidence interval [CI]: \u22127.6, \u22120.7; P = .02). For TSK-11, nonresponders had less of a decrease (\u22120.1) than responders (\u22123.2 pt) (mean difference, 3.1 pt; 95% CI: \u22125.9, \u22120.3; P = .03). Reduced shoulder disability was related to less pain-related fear and catastrophizing ( P &lt; .01), and differed by responder group. Nonresponders had no relationship between change in pain-related fear and catastrophizing and disability ( P&gt;.05); responders had an overall negative relationship ( P &lt; .04).<\/jats:p>\n                  <jats:p>CONCLUSION: Pain-related fear and catastrophizing changed over time for individuals with rotator cuff tendinopathy, and changes varied by participant. Those who were not satisfied at 8 weeks had higher levels of pain-related fear and catastrophizing, while those who were satisfied had reduced pain-related fear and catastrophizing. Less pain-related fear and catastrophizing was related to decreased disability. J Orthop Sports Phys Ther 2026;56(8):546-554. 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