The present study developed a 50 m-forceplate system and examined relationships between the impulse calculated from ground reaction force (GRF) from start to 50m and the maximum running velocity (Vfmax). Thirty five male sprinters performed maximal sprint on the system, using starting block. The forward and vertical components of impulses (IMPf and IMPv. respectively) were computed far each support phase by integrating the GRF. The highest correlation coefficients for both IMPf(~0.736)a nd IMPv(r=-0.729) were found at the distance of 10 m from the start. These results indlcate the ability to keep lMPv low and lMPf high seems to be important for achieving greater Vfmax, notably in the initial stage of acceleration phase.
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