Aerobic exercise can promote catabolic metabolism, and then interfere with the growth of fast muscle fibers. Although protein will not easily participate in energy metabolism, protein will also participate in energy supply during long-term aerobic exercise.

Studies have found that two hours of moderate aerobic exercise can exhaust 90% of leucine pairs (an amino acid that is very important for muscle growth) in the body. Under normal circumstances, normal leucine levels can prevent muscle decomposition caused by excessive exercise.

Extended data Aerobic exercise refers to the physical exercise carried out by the human body under the condition of adequate oxygen supply. That is, in the process of exercise, the oxygen inhaled by the human body is equal to the demand, achieving physiological balance.

Simply put, aerobic exercise refers to low-intensity, rhythmic exercise, which lasts for a long time (about 30 minutes or more) and has moderate or upper-middle intensity (60% to 80% of the maximum heart rate).

References:

Baidu encyclopedia-there is muscle decomposition