Reliability of inversion and eversion peak- and average-torque measurements from the Biodex System 3 dynamometer

Objective: To determine the reliability of inversion and eversion concentri c isokinetic-strength measurements from the Biodex System 3 isokinetic dyna mometer. Setting. University biomechanics research laboratory. Subjects: Thirty-five volunteers free from any lower leg and ankle injuries within the preceding year. Measurements: Peak (PT) and average (AT) isokinetic torque at 30 degrees /s and 120 degrees /s for subtalar-joint inversion and eversion. Results: PT intraclass correlation coefficients (ICC2,1) ranged from .54 to .92. AT ICC2,1 ranged from .55 to .91. These ICCs were good to excellent f or both PT and AT at each speed and motion tested, except for fair ICCs pro duced from right-foot-eversion measurements at 30 degrees /s. Conclusions: Inversion and eversion subtalar-joint strength measurements fr om the Biodex System 3 isokinetic dynamometer are reliable.