Which acid accumulates in the muscles to cause fatigue ?

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Lactic acid. Lactic acid buildup occurs when there's not enough oxygen in the muscles to break down glucose and glycogen. This is called anaerobic metabolism Lactic acid is formed and accumulated in the muscle under conditions of high energy demand, rapid fluctuations of the energy requirement and insufficient supply of O2. During intense exercise sustained to fatigue muscle pH decreases to about 6.4-6.6. Energy is obtained from a substance called glycogen for the performance of work in the body. This substance is converted into glucose. Working longer, various types of toxic substances are collected in the muscles, that is, the continuation of the work starts converting an element called glycogen into lactic acid due to which the muscles start shrinking. Lactic acid is converted to glycogen once oxygen is replenished, but due to lack of oxygen, muscles start feeling fatigue and breathing speed increases.

Which acid accumulates in the muscles to cause fatigue ?

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