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Clinical Trial

The Association between Humeral Retroversion and Shoulder Strength on Throwing Velocity and Elbow Varus Torque in Recreational Overhead Athletes

One of the fastest human movements to occur in all of sport is the overhead throw.25 During the execution of the throw, the upper limb is subjected to extremely large forces and torques that are needed to maintain control and stability. Over time, these athletes (e.g., baseball players) develop bony and soft tissue adaptations of the arm and shoulder that include alterations in shoulder motion and strength. It is thought that these adaptations are necessary to enhance performance while decreasing injury risk. However, researchers have demonstrated that these adaptations may progress, and lead to injury development. Therefore, we are looking to develop a better understanding of the relationships between a bony adaptation (an adapation that changes the amount of twist in the upper arm bone) to how fast a person can throw a ball and the strength of the shoulder muscles.

Eligibility Criteria

  • To be eligible to participate in this study, participants will be required to meet the following inclusion criteria: male or female 18 ? 40 years of age must be physically active as defined as exercising at least 30 minutes per day, three times per week; and have participated in recreational overhead throwing sporting activities (e.g., participates in baseball, handball, softball, etc.) within the previous two years. Participants will be excluded if they: report any conditions that may result in muscle weakness or changes in normal motion have previously fractured their upper arm bone (humerus) have suffered a significant injury in the previous 3 months, or surgery to the shoulder or elbow in the previous year

Contact Information

    Daniel Hannah, PhD, ATC