We studied three-dimensional motion analysis of trunk rotation in baseball pitching. Six male baseball players (two experienced pitchers and four experienced field players) and an inexperienced player were studied. The subjects were filmed pitching from six directions with six motion cameras, and synchronized with each other. The angle, angle velocity of trunk rotation, duration of LFC (lead foot contact), MinR (minimum rotation), MAV (maximum angular velocity), BR (ball release), and MaxR (maximum rotation) were calculated.
