It occurs with a weakening of energy stores, a decrease in the amount of glycogen, an accumulation of metabolic residual products.
1-)Residual products lower pH, which reduces ATP production through glycolysis.
2-)In addition, the accumulated H+ ions replace calcium, which weakens the formation of actomyosin bridges and reduces the contraction force of the November muscle.
3-) Accumulation of lactic acid at the end of providing energy by an aneorobic way