Relationship Between Tendon Tissue and Shoulder Disability Change During an 8-Week Exercise Intervention for Rotator Cuff Tendinopathy: An Observational Study.

Importance: Understanding how tendon structure relates to disability improvement during exercise interventions in rotator cuff tendinopathy is essential for optimizing individualized treatment strategies.

Objective: The objectives of this study were to characterize changes in supraspinatus tendon thickness and internal architecture over an 8-week resistive exercise intervention and evaluate the relationship between these changes and patient-reported shoulder disability.

Design: This was a prospective longitudinal observational study.