Shintaro Toyoshima

Contribution of the body parts to throwing performance

The human body, mechanically speaking, comprises a system of levers capable only of rotary motions. Most human movement consists of a series of rotations of many segments of the body. The more rotations that are brought into the action, if they are timed in sequence, the higher the final speed of the action.

Force-Velocity Relation in Throwing

Abstract The relationship between load and maximum velocity in throwing a ball was investigated. A velocity measurement was constructed making use of cadmium sulfide. The subjects were seven adults and six boys. They threw hand rubber balls of different weights in a horizontal plane, using their best efforts. Ball velocity decreased as ball weight increased. The experimental equation was obtained by a least squares method. Energy of the thrown ball was calculated. There was a great difference in performance among ages.