In the human body, sugar oxidation and combustion, although not the most heat-producing, can be considered the body is the cleanest and highest quality functional substances. The vast majority of the energy used during any short period of intense exercise is provided by sugar oxidation. Sugar can provide the body with all the energy needed for exercise.
When exercising at 90-95% of the maximum oxygen uptake above the intensity, sugar provides 95% of the energy for the body, and a long time of small-intensity exercise, the body is also the first use of sugar oxidation to supply energy, only when the available sugar depletion, only to use to fat or protein for energy, sugar is also the main fuel for medium-intensity exercise, in general, the amount of sugar ingested by the muscles during exercise can be quiet 20 In general, muscle sugar intake during exercise can be 20 times or more than during quiet time.
Sugar is the most easily oxidized and completely oxidized, the end products of sugar metabolism are carbon dioxide and water, so as not to increase the acidity of body fluids, and sugar oxidation of oxygen consumption is small, compared with fat, in the conditions of consumption of equal amounts of oxygen, sugar is 4.5% more efficient than fat production, this advantage is especially in the case of oxygen deficiency of the body is more important, and sugar is the only one of the three major production nutrients can both Sugar is the only one of the three energy-producing nutrients that can undergo both anaerobic and aerobic oxidation. Sugar can be used in anaerobic conditions for glycolysis in human cytosol and in aerobic conditions for complete oxidation in human cytosol and mitochondria, so sugar can provide energy to human muscles under different exercise conditions.
Sports people should supplement sugar in the right amount before, during and after exercise. Both can provide sufficient energy for the body, increase sports performance, but also to speed up the recovery of fatigue of the body after exercise.