ANATOMY

Detailed explanation-1: -Introduction. An eccentric (lengthening) muscle contraction occurs when a force applied to the muscle exceeds the momentary force produced by the muscle itself, resulting in the forced lengthening of the muscle-tendon system while contracting (Lindstedt et al., 2001).

Detailed explanation-2: -Eccentric muscle contraction is muscle lengthening as the muscle produces tension and the insertion moves away from the origin. The net muscle movement is in the opposite direction of the force of the muscle because the contractile force is less than the resistive force.

Detailed explanation-3: -It is important to understand that a muscle can lengthen and be active (an eccentric contraction), can lengthen and be inactive (a relaxed muscle), or can lengthen and gradually change from active to inactive or vice versa.

Detailed explanation-4: -During eccentric contraction, the muscle lengthens as the resistance becomes greater than the force the muscle is producing.