Why are blacks in East Africa so different from blacks in West Africa?

East African countries, even though immigrants have been integrated into African blacks in recent hundreds of years, are still very different from the constitutions of African blacks.

1, people in hot areas are more explosive than those in cold areas. For example, people in the Middle East and southern Europe are more talented in sprint events than people in western Europe, northern Europe and eastern Europe. Southeast Asians are more talented in sprinting than East Asians. It seems that all the sprinters in China are from the south, especially Guangdong, Guangxi and Fujian are better than the north. However, this gap is not very big, and there are many exceptions.

2. The East African Plateau is not so hot. Moderate plateau, sparse vegetation and flat and open terrain seem to be conducive to the evolution of endurance. White people and yellow people often get good results in long-distance running events. It shows that the advantage of black people in East Africa in long-distance running is not so absolute.

3. Although sub-Saharan Africa has traditionally been a black area, the main black tribes began to expand eastward and southward from Nigeria and Cameroon in West Africa around the14th century. That is to say, the typical black people in our eyes only bypassed or crossed the rain forest in the Congo River basin more than 600 years ago and spread eastward and southward.

In fact, these typical blacks arrived in southern Africa (such as South Africa) at the same time as whites, and even in some places, they arrived later than whites.

Most of the blacks trafficked to the United States come from West Africa, because West Africa is closer to the United States. Black people who lived in southern Africa and central Africa earlier do not look typical.

Extended data:

West Africans are explosive. Physiologically, they secrete more androgens. Androgen can promote the growth of muscles and bones, which is equivalent to producing stimulants by itself. Therefore, West Africans have higher bone and muscle density than other races, and their sprint ability is particularly strong.

From the perspective of natural selection, West Africa has always maintained a nomadic life, and frequent wars have made it possible for the strongest talents to survive.

East Africans are generally thin, but they have good endurance. You see, in the international arena, Kenya and Ethiopia, two East African countries, have always taken turns in the long-distance running events of 800 meters and more. Long-distance running is the strength of East Africans for several reasons.

First of all, the topography of East Africa is plateau, and people who live here for a long time have a large lung capacity.

Secondly, a black calf in East Africa is 400g lighter than a white calf in Europe, which can save 8% energy consumption when running.

Third, they live near the equator, with developed sweat glands, rapid heat dissipation and low cardiopulmonary pressure when running.

These factors have brought greater endurance to East Africans. Some researchers believe that the physique of East Africans suitable for long-distance running is also related to evolution. In fact, many long-distance runners in Kenya come from a nomadic tribe called Kalenjin, which has a long tradition of stealing cattle legally.

As long as the thief is not caught by the owner of the cow, he can own the cow. In this way, both cattle thieves and cattle owners often have to run for dozens of kilometers. According to this tradition, some scholars say that it also gives people who are good at long-distance running a very strong evolutionary advantage.

Physiologically, human skeletal muscle is composed of different muscle fibers. These muscle fibers can be divided into two categories, slow muscle fibers and fast muscle fibers. Slow muscle fiber has strong anti-fatigue ability and is suitable for sports with low strength and long time, such as long-distance running.

Fast muscle fibers have great contractility, but are easy to fatigue, which is suitable for sprints that need explosive force. Top athletes can only train one of them, and the proportion of slow muscle fibers in marathon athletes is over 90%; The muscles of the former 100 meter athletes are mainly fast muscle fibers, and the proportion of slow muscle fibers is less than 5%.

They are also black, but they are not the same people who won the championship in long-distance running and dominated the sprint. Different natural environments and evolutionary choices lead to different physical qualities of West Africans and East Africans, which leads to such a result.

References:

Black race _ Baidu Encyclopedia

Long-distance running hero out of Africa? African Legion Won Gold-Olympic Games-People's Network