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The stretch-shortening cycle is a combination of eccentric-concentric contractions which functions by integration of the golgi tendon organ (GTO) and the muscle spindle. There are three phases in a plyometric sequence: the eccentric phase, or landing phase; the amortization phase, or transition phase; and the concentric phase, or take-off phase. 
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- Donche, Dan (2008). FF Trainer Certification Guide. USA: Fatal Fitness.