A novel detection technique for detecting sports motion based on electrostatic induction

In this study, we propose a technique for detecting sports motion by measuring the current generated because of a change in the capacitance between a given electrode and the human body by using wireless portable sensor. A theoretical model is proposed for the electrostatic induction current generated because of a change in the electric potential of the subject´s body due to foot motions. We apply the proposed technique to determine the time for which an athlete´s foot remains in contact with the ground and off the ground during pitching motion while playing baseball. Thus, we can quantitatively estimate the time for which an athlete´s foot is in contact with the ground and off the ground on the basis of the time at which peaks were observed in the waveforms of the electrostatic induction current.