This will also provide insight into how a change in one GRF component might affect the others. Further research is required to see if braking, propulsive, and vertical impulses can be modified with specific training. Although there was a weak trend for faster athletes to produce lower magnitudes of braking, the possibility of braking having some advantages could not be ruled out. In conclusion, it is likely that high magnitudes of propulsion are required to achieve high acceleration. Also, greater magnitudes of relative propulsive impulse were associated with a high mean hip extension velocity of the stance limb (p < 0.05). Paired t-tests revealed that lower magnitudes of relative braking impulse were associated with a smaller touchdown distance (p < 0.01) and a more active touchdown (p < 0.001). In addition, the faster athletes tended to produce only moderate magnitudes of relative vertical impulse. Relative braking impulse accounted for only 7% of variance in sprint velocity. The regression results showed that relative propulsive impulse accounted for 57% of variance in sprint velocity. Associations between GRF impulse (expressed relative to body mass) and various kinematic measures were explored with simple and multiple linear regressions and paired t-tests. Thirty-six athletes performed maximal-effort sprints from which video and GRF data were collected at the 16-m mark. The Hunting Ground is helping define the problem of campus sexual assault for policymakers, college administrators, students, and their parents. This study tested the relevance of these hypotheses to the acceleration phase of a sprint, using GRF impulse as the GRF variable of interest. The literature contains some hypotheses regarding the most favorable ground reaction force (GRF) for sprint running and how it might be achieved.
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