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The overhand (or overhead) throwing motion is a single-handed throw of a projectile where the object is thrown above the shoulder. The overhand throw is a complex motor skill that involves the entire body in a series of linked movements starting from the legs, progressing up through the pelvis and trunk, and culminating in a ballistic motion in the arm that propels a projectile forward. It is used almost exclusively in athletic events. The throwing motion can be broken down into three basic steps: cocking, accelerating, and releasing. Desired qualities in the action produce a fast, accurate throw. These qualities are affected by the physical attributes of the thrower like height, strength, and flexibility. However it is mainly the throwing motion mechanics and the thrower's ability to coordinate them that determines the quality of the throw. Determining the desired qualities of the throwing motion is difficult to assess due to the extremely short amount of time that it takes professionals to perform the motion. ==The motion== In the overhead throwing motion the body is a kinetic chain, and the efficiency of the kinetic chain determines the quality of the throw (velocity and accuracy of the projectile). The thrower uses muscle segments throughout the whole body to transfer potential energy from the lower extremities to the upper extremities where it is then transformed into kinetic energy as the projectile is released.〔Seroyer, Shane. ("The Kinetic Chain in Overhand Pitching" ), ''Sports Health'' March/April 2010〕 This throwing motion is described based on the analysis of professional athletes, mainly baseball pitchers, as they are recognized as having mastered this skill. There are variations in the throwing motion unique to the thrower, but generally the throwing motion is performed as follows. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「overhand throwing motion」の詳細全文を読む スポンサード リンク
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