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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.
Even if no one knows how it works, itâs easy to understand why you need eccentric contraction: we regularly need to control, slow-down the lengthening of a muscle, a âbrakingâ contraction. The simplest example of an eccentric contraction is lowering a barbell in a biceps curl. Obviously the biceps muscle contracts to lift the barbell up. But itâs also contracting as you lower the weight â if it werenât, you would drop it pretty fast!