This study evaluates the reliability of isokinetic testing of the knee flexors and extensors
in children with cerebral palsy (CP). Twelve children (seven girls, five boys), aged 9 to 15 years,
participated in this study. The children's strength was measured bilaterally, using a
dynamometer. Each participant was tested twice at an interval of 1 week. During each session,
the participant performed five consecutive cycles of knee extension and flexion. Testing velocity
was set at 90°/s, and the range of motion was 80°, starting with the knee flexed at
80° and ending in full extension. The measured variable was the peak torque. Reliabilities were
determined using intraclass coefficient (ICC) with two-way ANOVA model. The ICCs for individual
sessions range from 0.90 to 0.99. ICCs for the eight repetitions over the two sessions range from
0.95 to 0.98. The findings indicate that measuring isokinetic strength in the tested population is
highly reliable and should be considered in rehabilitation protocols.