Short, fast sprint
Explanation:
During the short period of the fast sprint, the muscles are demanded to act really fast and are therefore exerted because there is little time for oxygen to diffuse into the tissue and satisfy the energy needs of the muscles. The energy demand is higher than the oxygen supply. Therefore cellular respiration of the cells of the tissue incline towards anaerobic respiration (glycolysis in the cytoplasm). This fast pace can't be sustained because glycolysis is an inefficient way of generating energy by cells. Pyruvate, the end product is converted into lactic acid. Accumulation of lactic acid causes muscle spasms.
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