The purpose of this study was to establish guidelines for proper selection of soccer balls for elementary school students. Ten youth soccer team players aged 8-11 years, who all kicked using their right foot, were included in this study. The participants were asked to perform an instep kick with full strength to hit a stationary soccer ball toward a target 8 m away. Two types of balls (with different masses) were used in the experiment. A size 4 ball weighing 360 g and a size 3 ball weighing 300 g. For data collection, a Vicon optical three-dimensional motion analysis system was used. For kinematic calculations, ball velocity, toe velocity, and rebound ratio (ball velocity / toe velocity right before impact) were calculated. A significant difference was observed in velocities in both kicks (p
"Kinematic analysis of the instep kick action of elementary school students in soccer ―focus on ball speed and rebound ratio－,"
ISBS Proceedings Archive: Vol. 39:
1, Article 83.
Available at: https://commons.nmu.edu/isbs/vol39/iss1/83