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Though energy is needed for all cellular work, the focus depression of this article is muscle contraction and body composition. All muscle contraction draws energy from adenosine triphosphate or ATP. The primary source of ATP comes from glucose, which is stored in the muscles and liver as glycogen (glucose and water). Muscle contraction during anaerobic( resistance training ) can use glycogen directly to form ATP. The process is anaerobic glycolysis, meaning it can use the glucose as energy with little oxygen depression ( 90% glucose, 5% depression oxygen and 5% fatty acid ). Our muscles store enough ATP for short periods of muscle contraction, when ATP is exhausted it leads to muscle failure. The rest period between weight training sets allows added ATP to be produced and used for muscle contraction. During early stages of aerobic exercise, ATP is again created mainly from glucose until the heart and lungs provide enough oxygen to the muscles to allow fatty acids to be used to create ATP.
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