What occurs when the production rate of lactic acid exceeds the removal rate during intense exercise?

When the production rate of lactic acid exceeds the removal rate during intense exercise, muscle soreness develops due to the accumulation of lactic acid in the muscles. This condition, often referred to as lactic acidosis, occurs when the body relies on anaerobic metabolism for energy, especially during high-intensity exercise, where oxygen supply is inadequate for the energy demands placed on the muscles.

As lactic acid accumulates, it can lead to a drop in pH within the muscle cells, causing discomfort and contributing to the sensation of fatigue. This state of elevated lactic acid often correlates with the burning feeling athletes sometimes experience during strenuous activity. Effective removal of lactic acid occurs through various recovery methods, but when production outpaces removal, it creates an environment that promotes muscle soreness and limits performance.

The other choices do not apply in this context, as fatigue continues rather than ceases, strength capacity does not immediately increase, and aerobic capacity does not enhance when lactic acid accumulates excessively; instead, it may impair performance and recovery.