2022 Volume 20 Pages 127-135
It is important to reduce the vertical bar reaction force (BRF) by utilizing the vertical velocity and angular momentum acquired through the takeoff to make kicking pullovers successful. This study formulated the mechanical condition of success in kicking pullovers as the effects of the vertical velocity and movement time on the required vertical BRF in the arm support phase by modeling the vertical movement of the center of mass (CoM). In addition, kinematics of successful kicking pullovers by 13 adult men were measured under various bar-height conditions (ratio to the body height: 65-105%). The modeling suggested that increasing the vertical velocity “v” or moderately shortening the movement time “T” reduces the required vertical BRF, and in particular, satisfies the relationship vT = 2h (“h” is the upward distance moved by the CoM through the arm support phase), which efficiently reduces the BRF. In the measurement, the parameters were close to the optimal relationship, except for the 65% condition. When using a bar height of 75% or more, increasing the vertical velocity and angular momentum around the CoM at takeoff while satisfying the optimal relationship would be effective for successful kicking pullovers. When using lower bars, increasing the angular momentum would be the main task.
