PREDICTION OF LET POWER IN THE HORIZONTAL JUMP USING HORIZONTAL DISPLACEMENT AT THE CENTRE OF MASS

Abstract

The purpose of the research was to measure the relationship between resultant force, velocity and pressure from the legs and the horizontal distance jumped. The objective is to predict leg power from simple horizontal displacement of the centre of mass of the body. The application provides a simplistic method of evaluating jumping performances from a testing and evaluation perspective. A typical example might be the measurement of leg power during the pre or off season training of ski jumpers where a maximal jump effort is required from a pre flexed knee position. Prediction equations are developed for force, velocity and power resulting from the leg extension motion. Variables for body mass and distance jumped are calculated into equations including constant measures. The equations are based on the results of 22 subjects each performing 3 maximal jumps, with the greatest jump displacement used. The equations include the following: Resultant Force FR = 16.097 (Mass) + 1.701 1 (Distance (cm)) + 70.874 Resultant Velocity VR = .010571 (Distance (cm)) - 0.013 189 (Mass) + 2.4186 Resultant Power PR = 18.461 (Mass) + 7.34 (Distance (cm)) - 70.684