As the velocity of contraction increases, the force that can be developed decreases despite maximal effort. The difficulty is to have the training movement patterns replicate those of the contest activity. Type of Contraction Muscles are strongest when contracting eccentrically and weakest when performing concentrically. The reason for the greater eccentric strength resides within the contractile mechanism of the muscle, NOT an energy system. Emphasizing the same type of contraction in training as occurs in a competitive performance could facilitate event-specific neural adaptation to occur.
Concentric force is increased when preceded by high velocity eccentric contractions.
The type of contraction must duplicate that of an event to have carry-over value. To stimulate muscle growth, eccentric contractions have a greater potential for effect than concentric contractions. Beginners' training does not have to be as specific as that for elite athletes. The movement pattern and contraction speed, type, and force should replicate the intended activity. Any departure from one of these factors will result in inappropriate adaptations.