Estimates of functional muscle strength from a novel progressive lateral step-up test are feasible, reliable, and related to physical activity in children with cerebral palsy.

Number of repetitions performed at 20 cm and the LSUT composite score were significantly related to hip physical activity counts in children with CP ( r = 0.33 and 0.31, respectively, both p < 0.05), but the relationship between repetitions at 10 and 15 cm did not reach statistical significance ( r = 0.26 and 0.29, respectively, p = 0.076 and 0.056).

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