Athletic performance depends upon the ability to properly coordinate movement, endurance, and strength. These functions are all controlled by the nervous system. The brain generates the intent and sends the signals to the individual muscles to perform the activity intended.
It is essential that the signals generated in the brain are transmitted clearly and cleanly to the intended muscles. Only then can those muscles perform the complex and exact movements necessary for athletic performance. Any interference with nerve signals will decrease the athlete's ability to perform at the highest competitive level.