Hamstrings Contraction Regulates the Magnitude and Timing of the Peak ACL Loading During the Drop Vertical Jump in Female Athletes.

The hamstrings activation presented an increasing trend throughout the landing (see Ueno et al 53 ), whereas the time of peak vertical GRF, knee abduction, internal tibial rotation, and anterior tibial translation, which induce higher ACL strain, were observed from 50 to 90 milliseconds (see Ueno et al 54 for more detailed knee kinematics).

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