Throwing


Throwing is the launching of a ballistic projectile by hand. This action is only possible for animals with the ability to grasp objects with their hands.
Humans, being bipedal, have a wide variety of throwing techniques and abilities. These have been employed in warfare – first through rock-throwing, then refined weapon-throwing, and into modern day with hand grenades and tear gas canisters. Throwing is used in many sports and games, particularly ball games, and in throwing sports the action is the main determiner of the outcome. These serve as forms of recreation and exercise in society.

Evolutionary history

Evidence of hominid throwing dates back 2 million years to Homo erectus.
Development of the offensive throwing of projectiles is mostly a development of the human lineage, although the aimed throwing of sticks and rocks by male chimpanzees during agonistic displays has been observed, first described by Jane Goodall in 1964.
"Accumulative throwing", that is, the targeted throwing of rocks at a specific target, leading to the gradual accumulation of a stone pile, has also been described for chimpanzees.
Wooden darts were used for hunting at least from the Middle Paleolithic, by Homo heidelbergensis. The spear-thrower is a development of the Upper Paleolithic, certainly in use by the Solutrean.
Human athletes can achieve throwing speeds close to ,
far in excess of the maximal speed attainable by chimpanzees, at about . This ability reflects the ability of the human shoulder muscles and tendons to store elasticity until it is needed to propel an object.

Types

Types of throws include overhand throws, underhand throws and using both hands. Overhand throws are thrown predominantly above the shoulder, underhand throws below. Overhand throws are usually significantly faster, and ball speeds of have been recorded in baseball. Thrown objects can often be intentionally spun for stability or aerodynamic effects.

Overhand throwing motion

The overhand throwing motion 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.

Uses

Thrown weapons

Throwing is used for propelling weapons such as stones or spears at enemies, predators, or prey.
Track and field contains four major throwing events: discus throw, hammer throw, javelin throw and shot put. The weight throw is the fifth most common field throwing event, while the club throw is unique to disability athletics.

Sexual differences

Research by MythBusters found that men and women throw almost equally well with their non-dominant hand, suggesting that the sexual differences were probably due to differences in training.