Relationship between preparation to take off and ground reaction force characteristics in male long jumpers

Document Type : Original Article

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Department of Athletics Training, Faculty of physical education for men, Alexandria University

Abstract

Subjects: Six national level male long jumpers (age: 22.30±2.20, height:1.84±0.027, weight :73.5±6.65, personal best:6.54± 0.42  ) were participated in the current study ,aftar an appropriate warm up every jumper had three trails. The best trial of each of the six  subjects was analyzed in obtaining kinematic and kinetic data. Data were obtained only when the performer was in contact with the force platform. The study was conducted in an outdoor track in the faculty of physical education, Alexandria University .The study procedures began when all jumpers declared themselves ready to begin, the participants performed without spikes on their shoes in order to protect their feet from the shock of hitting a hard metal take off plate located beneath the covering. Conclusion  Although the importance of takeoff phase for generating the appropriate force in long jump, the preparation to takeoff phase also plays an important role at the same moment .the adjustment of final steps obviously serves him to bring his foot in a position that facilitates the development of vertical force and velocity at takeoff his final steps before takeoff to reach the optimum position for force production. Longer ground contact time during takeoff is necessary to develop a large amount of vertical force which is needed to maximize the magnitude of vertical velocity. As a consequence of applying the vertical loading force over a longer duration is that the rate at which the force is developed is small. So training programs should include technical exercises to optimize the preparation phase of takeoff, also coaches should design special exercises to maximize leg stiffness during takeoff.

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