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eccentric contraction, a type of muscle contraction that occurs as the muscle fibers lengthen, such as when a weight is lowered through a range of motion.The contractile force generated by the muscle is weaker than an opposing force, which causes the muscle to stretch.Compare concentric contraction. type of muscle contraction that occurs as the muscle fibers lengthen, such as when a weight is lowered through a range of motion. The contractile force generated by the muscle is weaker than an opposing force, which causes the muscle to stretch. Compare concentric contraction.
Eccentric Defined. An eccentric motion is one in which a muscle is lengthened during contraction. In terms of a squat, the eccentric movement occurs in the downward phase of the squat motion as you control the movement. During that phase, the muscles in the legs are lengthening to slow the pace of descent. An analogy is lowering a bucket attached to a rope through a pulley.