A group of experts has identified the limit of human endurance by examining the strenuous effects on the body during the Tour de France and other epic events.
Examination of energy consumption in some of the longest sporting events in the world has shown that every person reaches the same metabolic limit – the maximum load that the body can endure in the long term.
Duke University researchers found that when we were training for days, weeks, or months, we could only achieve 2.5 times our calorie burning energy. Energy when resting – also known as rest.
Not even winners of the Tour de France can exceed this limit.
>>> Cyclists have a lower risk of cardiovascular disease, according to the study
"This defines the empire" What is possible for humans, "said co-author of the study, Herman Pontzer, an associate professor for evolutionary anthropology.
Beyond 2.5 times our metabolism, the body begins to break up its own tissue to make up for the long-term unsustainable calorie deficit.
The explanation for this is believed to be the body's own digestive system, which is unable to break down food and absorb calories fast enough to energize the body beyond 2.5 times the metabolic rate.
Researchers measured the daily calorie consumption of athletes from various disciplines, including runners who completed six marathons per week The US 201
The energy expenditure of the athletes started high, but then dropped to 2.5 times their calorie consumption when they later rest.
The runners in the race The Race Across the USA consumed 600 calories less a day after a 20-week marathon, suggesting that the body was reducing its metabolism to sustainable levels.
>>> How to Reduce the Effects of Hay Fever on Cycling
Co-author Catlin Thurber, who analyzed urine samples collected during the first and last leg of the race in the US, said, "It is a great example of limited energy expenditure, where the body is located. In all disciplines, energy consumption is later degraded, which challenges the notion that human endurance is associated with the ability to regulate the body temperature.
The study also found that the maximum energy consumption of endurance athletes at the highest level was only slightly higher than that of women during pregnancy in the womb.
Pontzer added, "I think that's a challenge for endurance athletes.
"Science works when proven wrong. Maybe someday somebody will break that blanket and show us what we miss. "