Age-related trajectories of muscle strength and power in individuals with cerebral palsy and the relationship to walking capacity.

The study is cross-sectional, so it cannot measure true longitudinal change in an individual's muscle performance over time. Only the knee extensors were tested; other muscle groups may show different trajectories. There were significant demographic differences between groups, including age, height, body mass, and sex distribution, though body mass normalization was used to mitigate this. The quantity and type of prior rehabilitative or medical interventions were not reported. Only two participants were at GMFCS level IV, so they were excluded from the GMFCS sub-analysis.

The authors have no conflicts of interest to disclose.

Do not interpret the stronger correlation between power and walking as proof that power training causes better walking outcomes. This is a cross-sectional association, not an intervention trial, so it does not demonstrate that increasing power will directly improve walking capacity.