Energy production is fueled by carbs, unaffected by inhaled oxygen. Takeaway : Anaerobic exercise is short and intense physical activity. This way you can keep up the intensity high and burn predominantly carbs. Taking breaks after maxing out your anaerobic capacity helps those systems recover. And after a minute you experience another sharp drop in performance. That’s why you can’t sustain max effort for more than 20-30 seconds. However, if ATP demands remain high those systems fatigue quickly. Carbs are broken down faster without the need for oxygen. The anaerobic systems can provide rapid energy output. Max effort and high-intensity exercises require a lot of ATP per unit of time. The anaerobic systems kick in – the phosphagen and lactic acid pathways. That’s still an aerobic process as you use oxygen to break down the carbs.īut if the intensity raises too much oxygen becomes the limiting factor. ![]() When you reach your max O2 uptake, called VO2 max, the aerobic system starts using more carbs. However, as the intensity rises you need more oxygen. Also because it uses mostly fats, which take longer to convert into ATP. But at a much slower rate as it requires oxygen. The aerobic system has the greatest ATP production capacity. When Do You Switch from Burning Fats to Carbs? However, here we group it together with the phosphagen system. Note : when people talk about the “anaerobic system” they usually mean the lactic acid pathway. Though their contribution to energy production depends on the type of activity. These 3 systems often work at the same time.
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