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To fully appreciate the importance of the two part movements, you must understand the effect it has on the muscles. The muscles are made up of millions of fibers called myofibrils. During the positive phase the myofibrils contract and use ATP bmi (adenosine triphosphate) as energy for their contraction. The bmi amount of ATP is depleted with the completion of each repetition. When the myofibrils reach a state of ATP exhaustion the muscle experiences momentary muscle failure. The effect the positive movement has on the muscle fibers is to increase the bmi strength and endurance of the fibers ability to contract. However, it plays a secondary role in the growth of the muscle. The myofibrils lack the ability to increase in numbers, which would lead to an increase in muscle size. During the negative phase movement most of the damage to the myofibrils occurs, especially if the muscle is worked to momentary muscle failure. This damage activates surface cells on the myofibrils called satellite cells.
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