From the Ironman to the Tour de France, some competitions test even the toughest endurance athletes. A study of energy expenditure during some of the world's longest, most grueling sporting events suggests that no matter what the activity, everyone hits the same metabolic limit, likely due to constraints on the digestive tract's ability to break down food.
Is there a limit to human endurance? Science says yes
From the Ironman to the Tour de France, some competitions test even the toughest endurance athletes. A study of energy expenditure during some of the world's longest, most grueling sporting event..
