The releasing of the muscles slowly to become longer under the effect of a load is known as eccentric contraction
An example of eccentric contraction is the elongation of the curl biceps as the load of the dumbbell is lowered down after lifting, such that while in the process of lowering rather than dropping the dumbbell down the biceps remain in contraction so as to maintain control of the descent
Along with eccentric contraction, isometric contraction and concentric contraction make up the three phases of muscles and tendon movement.
