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The eccentric phase is the first phase of a plyometric exercise. It is described as a rapid eccentric contraction that evokes a stretch reflex. The main mechanism of the stretch reflex is the muscle spindle. Muscle spindles are sensory mechanisms located within muscle fibers. They are sensitive to the rate and magnitude of a stretch. When a muscle fiber is quickly stretched eccentrically, the muscle spindle will be activated. The activation of a muscle spindle will result in a more powerful concentric contraction in the opposite direction (1).
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