What is meant by "concentric tension" of muscles?

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In concentric tension,increased muscle contraction causes muscle shortening,resulting in movement.Eccentric tension helps control the speed and direction of movement.Concentric and eccentric muscle actions are necessary for active movement and are referred to as dynamic or isotonic contraction.Isometric contraction (static contraction)causes an increase in muscle tension or muscle work but no shortening or active movement of the muscle.

What Is Meant by "Concentric Tension" of Muscles