If the same leg pedal force acts on the ground, the elasticity of blacks is 3-4 times higher than that of whites. So black people are invincible in track and field, especially in sprint. In addition, the black heel is longer. According to the test, the average length of heel key of Cuban black women's volleyball players is 25.9 cm and the longest is 29 cm.
Among the black muscle fibers, there are more white muscles and less red muscles than other races. Muscle fibers are divided into red muscle and white muscle according to different colors. White muscle cells have more mitochondria and more energy supply, so white muscle or people who are mainly white muscle belong to explosive players. Red muscle cells can provide energy evenly and continuously, so people with red muscles or mainly red muscles have stronger endurance and belong to endurance athletes. The muscles of black athletes are mainly white muscles, which are suitable for sprint events. Europeans and Americans have more red muscles, which are suitable for endurance and antagonistic sports. Some people say that Tai Sen is an explosive player by nature. Doctors in the former Soviet Union thought that the outbreak of Tai Sen was far worse than others, because Tai Sen's white muscle was far worse than others, but with more white muscle, there were fewer red muscles, so Tai Sen's innate endurance was insufficient.
Black athletes recover quickly after muscle fatigue: the content of red blood cells in black blood per cubic millimeter is higher than that of other races. Black people have more than 6 million red blood cells per cubic millimeter, which is higher than other races 1 0,000-10.5 million. The more red blood cells, the higher the hemoglobin content. The main function of hemoglobin is to carry oxygen to tissues to oxidize energy substances and release energy for physical activities. When the human body is exercising, hemoglobin can increase the oxygen supply and expel the metabolites lactic acid and carbon dioxide in the body.