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Lower limb vertical velocity at instant of touchdown (Ankle Vztd) for all subjects and trials (n=154). Best-fit equations and P-values listed here, with R2 values presented in accompanying panels. (A) Ankle Vztd versus running speed (Ankle Vztd=0.27x−0.02, P<0.0001). (B) Ankle Vztd versus average thigh angular velocity during entire gait cycle (Ankle Vztd=0.33x+0.01 where x is ωavg, P<0.001).
