Other than phosphocreatine breakdown, the fastest way to resupply ATP to a muscle is: anaerobic glycolysis.
When there is a shortage of oxygen (O2), glucose is converted to lactate by anaerobic glycolysis. Only during brief, intensive exercise, lasting between 10 seconds and 2 minutes, is anaerobic glycolysis a viable method of generating energy. Compared to aerobic metabolism, this is substantially quicker.
During a maximum exertion, the anaerobic glycolysis (lactic acid) system predominates for roughly 10 to 30 seconds. Over this time, it refills incredibly fast, producing 2 ATP molecules per glucose molecule, or around 5% of the energy potential of glucose (38 ATP molecules). The rate of ATP synthesis is approximately 100 times faster than that of oxidative phosphorylation.
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