The mouth is dry. The ears begin to hum. A V10 at maximum acceleration can produce 140 decibeles. Less fit drivers begin to get tired. The dehydration and muscular fatigue begin to cause problems.
Cramps appear in the spine, legs and forearms.
They are the cause of mistakes, increase of the time to make a corner, spins and crashes. The problems of vision are now added. The muscles of the eye also get tired and vision is upset, it becomes blurred, caused by the transmitted vibrations from the tires and the bumps on the track. Sometimes the driver ends up losing color vision. Eric Bernard admitted that on certain occasions he passed a car without recognizing who it was.