KINETIC ANALYSIS OF EACH HAND IN BASEBALL BATTING MOTION AT DIFFERENT HITTING POINT HEIGHTS

  • Kazumichi Ae
  • Sekiya Koike
Keywords: closed loop, instrumented bat, tee-batting

Abstract

The purpose of this study was to clarify the kinetic features of each hand under conditions of different hitting-point heights in the baseball tee-batting by using a bat with instrumented grip-handle. Twenty-three collegiate male baseball players’ motion were captured with a VICON MX system (12-cameras, 250Hz), and kinetic data at each hand were measured by using the instrumented bat equipped with 28 strain gauges (1000Hz). The vertical displacement of the hitting-point on the bat was mostly dominated by translational movement of the bat. The work of the force of vertical component showed that the positive work of knob-side hand was significantly larger at down swing and level swing phases. These results indicate that the knob-side hand is a great contributor to adjust the bat into the different hitting-point height in each phase.