From the Ironman triathlon to the Tour de France, some competitions test the limits of even the toughest endurance athletes. Now, a new 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—a maximum possible level of exertion that humans can sustain in the long term.
Click here for original story, Is there a limit to human endurance? Science says yes
Source: Phys.org