Journal of Athletic Training
To determine the reliability of concentric quadriceps muscle torque at 30°, 60°, and 75° of knee extension, 25 female university students were studied. Each subject was tested on the Kin-Com isokinetic dynamometer on 2 separate days, 7 days apart. The dynamometer's speed was set at 60°ls. Intraclass correlation coefficients for 30°, 60°, and 75° were 0.84 (p<.01), 0.87 (p<.01), and 0.83(p<.01), respectively. The standard errors of the measure were 5.92 N·m, 7.65 N·m, and 7.35 N·m, respectively. Based on the instrumentation and protocol used in this study, we believe angle-specific torques have good reliability. Because of the error size, clinicians using similar methodology to determine angle-specific torques should be cautious when comparing differences between angle-specific torques of less than 12 to 16 N·m.
Arnold, B. L.; Perrin, D. H.; and Hellwig, Evan V., "The Reliability of Three Isokinetic Knee-extension Angle-specific Torques" (1993). Kinesiology and Allied Health Faculty Publications. 30.