Acute Effects of Handheld Vibration Massage on Posterior Shoulder Soft Tissues.

Only 15 healthy men were studied, so results may not apply to women, older adults, athletes, or people with shoulder pain, tightness, frozen shoulder, impingement, rotator cuff tear, instability, or internal rotation deficit. The study measured only immediate effects after one session, so it does not show how long the range-of-motion change lasts or whether it improves symptoms, function, or performance. The paper reports that examiners were blinded, but it does not report that participants were blinded. The massage was given by one physical therapist, but the paper suggests the device is intended for self-care, which was not tested. Pressure was set by participant report on a numerical rating scale, so actual pressure may have varied between participants. Vibration was applied to the whole infraspinatus fossa, so the effect cannot be assigned to one tissue such as the infraspinatus, teres minor, or posterior capsule.

Do not read this as evidence that vibration massage treats shoulder pain or tightness in patients. The participants were healthy men with no neck or upper extremity pain or injury, and the study measured only immediate range of motion and strength.