THE STUDY OF TEAM RESULTANT FORCE VANISHING PERCENTAGE IN ELITE TUG OF WAR PLAYERS

Abstract

This study was to analyze the factor of team pulling force vanishing percentage between groups with different numbers players and the largest pUlling force with unsteady motion in tug of war after sitting posture between players. The motion of nine female senior high school players(age =16.9 ± 0.6 years, height =163.8 ± 2.7 cm, mass =58.7 ± 4.3 kg) in tug of war was synchronized with a high-speed camera(JVC9800, 60 Hz)and a tensile (TEDEA, 900 Hz). The pulling force was gained by DASYlab6.0. The variance of the angle between the rope and ground was analyzed by Silicon Coach from the film, consisted by two to eight players. Results: The team pUlling resultant was smaller than the sum of individual players. The vanishing percentage of pulling force was increase with the number of players. The factor of force vanishing was the coordination between players. The larger numbers players are, the 'lower coordination was. This is so called Ringlemann effect; the factor was timing of the maximal pulling force with each player, therefore coordination was decreasing with the numbers of players, so was force.