A VIDEO ANALYSIS MEASUREMENT TECHNIQUE FOR THE ESTIMATION OF LEG POWER DURING THE PERFORMANCE OF THE HORIZONTAL JUMP

Abstract

A valid power measurement from video analyses provides a valuable method for kinetic evaluation. This research utilizes kinematic velocity data from the Peak 2D video analysis system to calculate power produced from the lower extremity during take off Force, Velocity, and Power measures calculated using commercial software packages (AMTI) on a force plate are used to validate the video analysis data. 20 subjects performed 3 maximal horizontal jumps using controlled arm and leg motion. The best of the jumps were analyzed from video images to provide Velocity of the Centre of Mass (C of M) data which is utilized to produce force and power measures using specialized software. The power measures are conelated to the force plate results to provide correlations of r = .82. A Prediction formulae is derived to adjust for error margins. The Power Measurement method provides an accurate prediction of muscle power produced during the horizontal jump.