Repeated sprints alter mechanical work done by hip and knee, but not ankle, sagittal moments

Objectives To quantify the changes in work done by lower limb joint moments during maximal speed running following a sports-specific repeated protocol. Design Observational with repeated-measures. Methods Recreational athletes (n = 18 (9 females), aged 26.2 ± 6.2 years) performed 12 30-m sprints on non-motorised treadmill. Three-dimensional kinematics and ground reaction forces were subsequently recorded 10-m overground sprint before immediately after protocol, from which we calculated sagittal plane hip, knee, ankle moments. Relative (J/kg) was reported as percentage of positive negative sum Results Following decreased 19% accompanied reductions total (−1.47 J/kg) (−0.92 work, addition to hip (−0.43 −0.82 knee (−0.28 swing. Compared less relative (−9%) (−3%) extension Reductions swing significantly correlated maximum (r 0.61−0.89, p < 0.05). Conclusions A protocol resulted mechanical sprinting. Interventions focused maintaining flexors/extensors phase may help prevent