A moderate-intensity activity lasting for which duration uses the aerobic system is called Lactic Acid System.
The anaerobic lactic short-term (lactic acid, no oxygen) system starts to provide more energy to power the muscle.
Blood glucose and muscle glycogen reserves serve as the system's fuel sources. This mechanism also generates lactic acid as a byproduct in addition to energy (ATP).
The aerobic energy system refers to the oxygen-aided burning of lipids and carbohydrates.
The quantity of energy that may be expended during a single bout of vigorous exercise restricts the anaerobic pathways' ability to regenerate ATP at high rates.
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