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Though energy is needed for all cellular function, the focus vegan diet of this article is muscle vegan diet contraction and body composition. All muscle contraction derives 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 activity ( resistance training vegan diet ) can use glycogen directly to form ATP. The process is anaerobic glycolysis, meaning it can use the glucose as energy with very little oxygen ( 90% glucose, 5% oxygen and 5% fatty acid ). Our muscles only store enough ATP for short periods of muscle contraction, when depleted leads to muscle failure. The rest period between weight training sets allows additional ATP to be produced. During early stages of aerobic exercise, ATP is again created primarily 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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