What would be the result of a disease that causes excessive lactic acid accumulation in the muscles?

Muscles would fatigue easily.

Muscle fibers would use excess oxygen during cellular respiration.

Mitochondria numbers would decrease.

Blood supply within muscle fibers would increase.

Muscles would fatigue easily.

Explanation:

The disease is called Lactic Acidosis.

Your body needs oxygen in order to break down glucose for energy during exercises, however, during intense exercise, there may not be enough oxygen available to complete the process which results in a substance called lactate being made. This lactate is converted to energy without using oxygen, but it builds up in your bloodstream faster than you can burn it off causing your muscles to fatigue