For Pliometry (from Greek pleos = more and metros = measure) is meant physical activity characterized by the rapid succession of an eccentric contraction and a concentric. There are several training programs based on plyometric exercises that allow you to develop an increase in power, speed, explosiveness and maximum strength of the muscle. The term was introduced by Fred Wilt, athlete and later US coach, to define exercises that were previously generally termed "jump training."

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The biomechanical bases of plyometric action are still being studied. The most used mechanical model for muscle contains elastic components in series, and others in parallel, to the contractile component. The phenomenon mainly concerned is the so-called elongation-shortening cycle, in which an elongation of the muscle beyond its resting length (eccentric contraction) is followed by an active shortening thereof (concentric contraction). The serial components to the contractile unit, ie the tendons and cross-bridges, are capable of storing elastic energy due to elongation. If this first stage takes place in a sufficiently short time, that energy can be used along with that generated by the concentric contraction due to protein fibers within the sarcomars. The total expressed power is higher than that of the stimulated muscle without a previous stretch, and this type of exercise is therefore used in the technique and training of sports that need explosive movements such as jumps. Notemodify wikitesto Bibliografiamodifica wikitesto Voices correlateemodify wikitesto Links externalize the wikitesto

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