Sports physiologists at an Olympic training center could do this by checking for lactic acid buildup.
Lactic fermentation in muscle cells is a process that occurs, alternatively, in situations in which the body does not perform aerobic respiration. Considered a short-term metabolic device, activated when the body is subjected to intense physical effort in conditions of low muscle oxygenation.
With this information, we can conclude that the muscle cells start to contain a very high concentration of lactic acid, harming the cell's functioning.
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