Isokinetic muscle torque during glenohumeral rotation in dominant and nondominant limbs.

The purpose of this study was to evaluate the side-to-side differences of isokinetic muscle torque during shoulder rotation in healthy nonathletic subjects. The strength was examined at two angles of glenohumeral abduction in the scapular plane (45 degrees and 90 degrees, respectively) and at three velocities (180 degrees/s, 120 degrees/s, 60 degrees/s) using Biodex System 3Pro dynamometer. The maximal torques were achieved on dominant side in 45-degree abduction at 60 degrees/s velocity, both for external and internal rotation. A general pattern was observed: abduction angle and velocity increase provoked a decrease in torque values, but each antagonistic muscle group was sensitive to a different factor. Significant differences between dominant and non-dominant limb were not observed in nonathletic male.