AIM To investigate the test–retest reproducibility of the Muscle Power Sprint Test (MPST), the 10 9 5-m sprint test, and the arm-cranking Wingate Anaerobic Test (WAnT) in children and adolescents with cerebral palsy (CP). A secondary objective was to assess the construct validity of the MPST. METHOD Twenty-three participants with spastic CP (mean age 13y 3mo, range 7-18y, SD 3.6y; 18 males, five females, two classified as having spastic unilateral CP, 21 as having spastic bilateral CP) using a manual wheelchair for at least part of the day were recruited and tested in different rehabilitation settings in the Netherlands. Participants were classified as in Gross Motor Function Classification System Expanded and Revised (GMFCS-E&R) levels III and IV. RESULTS Intraclass correlation coefficients (range 0.93–0.99; 95% confidence interval 0.82–1.0)