Why is oxygen necessary for muscle contraction?

During period of time of heavy lifting or extreme muscleman air, sinew do not get oxygen quickly enough to provide vitality. In these face, the body must convert a substance called pyruvate into a substance called lactate, reports Scientific American language. Too much reliance on lactate can confidential information to high levels of acidulousness in muscles and disruption of metabolites. When muscles have adequate oxygen, a person performs aerobic physical exercise for extended periods without trouble. Production of lactate only generates enough energy for one to three moment of anaerobic activity.