Affiliations: [a] University of Virginia, Charlottesville | [b] Georgia State University, Atlanta | [c] Cedarville College, Cedarville, OH | [d] George Fox College, Salem, OR
Note: [*] University of Virginia, Charlottesville, VA 22903.
Note: [**] Address reprint requests to David H. Perrin, PhD, ATC, Memorial Gymnasium, University of Virginia, Charlottesville, VA 22903.
Note: [***] Georgia State University, Atlanta, GA 30303.
Note: [*****] George Fox College, Salem, OR 97305.
Abstract: This study examined the relationship between concentric and eccentric average force, peak force, average torque, and peak torque of the shoulder internal and external rotator muscle groups in 33 male subjects. Testing of the nondominant side was accomplished with the shoulder at 90 degrees of abduction and the arm in the frontal plane. Peak values for both force and torque were obtained from the highest point in the strength curves, whereas average values were obtained across the entire curve. Correlation matrices found a relationship between the isokinetic parameters of r = 0.86 to 0.97 for concentric external rotation, r = 0.94 to 0.99 for eccentric external rotation, r = 0.86 to 0.96 for concentric internal rotation, and r = 0.55 to 0.97 for eccentric internal rotation. The strong relationship between average and peak force and torque suggests any of these isokinetic parameters may be used for assessment of human muscular performance. Factors that potentially confound the interchangeable use of these parameters include damp, ramp, preload, and the range of motion through which isokinetic assessment occurs.
Keywords: Average force, peak force, average torque, peak torque, shoulder rotators
