Effectiveness of a Home-Based Eccentric-Exercise Program on the Torque-Angle Relationship of the Shoulder External Rotators: A Pilot Study.

The study included only 10 healthy volunteers, so the findings cannot be generalized to patients with shoulder pain or injury. It was a pre-post case-series pilot in which all participants received the same program, so changes could reflect natural variation, testing familiarization, or other factors. A single unblinded investigator performed all testing. Exercise and testing positions differed from the throwing motion, so the magnitude of functional carryover is uncertain. Isometric torque was measured only at five angles 15 degrees apart, so changes between those points could have been missed. The training load and duration may have been too low to produce isometric torque-angle changes, as the authors suggest. Participants continued normal exercise and daily activities, so other activity could have influenced results.

Do not read the improved terminal internal-rotation eccentric impulse as proof that this home program prevents shoulder injury or improves isometric strength. The study had 10 healthy participants, used a pre-post design, and isometric torque changes were not significant (P = .56).