Scientists from Duke University said that they managed to find the boundary of human endurance, analyzing the race of almost 5 thousand kilometers, according to BBC.
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According to researchers, the limit of endurance is calorie intake, which is 2.5 times the metabolic rate of the body at rest, that is, 4,000 calories per day for the average person. Anything higher than this will not allow a person to maintain such a regime in the long run.
A person can consume 4 thousand calories per day
Moreover, the study shows that pregnant women are champions in endurance, because they live almost on the verge of what the body can cope with.
The study began with a study of "Run through the USA", in which athletes ran about five thousand kilometers from California to Washington for 140 days. The competitors ran six marathons a week for several months, and the scientists investigated the effect of such loads on their bodies.
At the same time, scientists recorded the level of calorie consumption at rest (when the body relaxes) before and after the race. In addition, recorded the number of calories that were burned during the race. As a result, it turned out that at first the calorie intake was high, but in the end it was leveled at a level about 2.5 times higher than at rest.
The researchers also managed to find a relationship between the duration of the race and energy consumption. The longer the race, the harder the calories burned. Scientists emphasize that a person can easily go beyond his daily calorie expenditure in the short term and this will not be a big problem for the body, but in the long term such a regime is impossible.
Scientists also note that the limit is 2.5 times the average norm is the limit primarily for the human digestive system, and not the heart, lungs or muscles. It turned out that the body can not absorb, consume and absorb enough calories to constantly maintain a high level of energy consumption.
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