Anaerobic metabolism is responsible for the majority of energy production in all-out efforts lasting approximately 1 to 10 minutes. A critical point needs to be made regarding the anaerobic threshold. The closer you can get your anaerobic threshold to your Max VO2, the faster you will become. Simply having a high Max VO2 does not necessarily make you fast. Being able to sustain an effort close to your Max VO2 is what will determine whether you are fast or not.
Lactic acid interferes with the muscles ability to contract.
The burning sensation experienced with the accumulation of lactic acid is the result of a change in muscular acidity. The ability to tolerate and buffer the effects of this changing acidic environment is what anaerobic training is all about. This is the energy stored in muscles and available immediately for use by the muscles in contraction and relaxation. A limited amount of ATP can be stored in muscles. When the intensity of effort is maximal, this energy source is depleted in 20-30 seconds.