Acute effects of prolonged physical exercise: evaluation after a twenty-four-hour ultramarathon.

Background: The consequences and risks of prolonged physical exercise are not well established.

Objective: To evaluate the effects of prolonged physical exercise on the participants of a 24-hour ultramarathon race.

Methods: Twenty male runners were selected for evaluation a day before and immediately after the race, where the athletes had to cover the most distance in 24 hours.