The evolution of easier births means slower walking and pelvis issues

The width of the hips seems to be the result of complex bodies between development One of the greater brains and walking in a straight position, according to the largest study of its kind so far.

He says: “If your mind becomes larger and greater during the same evolutionary time because your sink is narrow, then this, of course, results in conflict.” Vagheesh Narasimhan At the University of Texas in Austin.

This idea, which was proposed for the first time in the 1960s, is known as the obstetric dilemma. Recently, the risk of pelvic floor conditions has also been suggested in factors. The pelvic floor is a layer of muscles that keep our organs in place. If he weakens or tears, it may lead to smooth and During birth problems.

“The dilemma of the obstetrics has been scattered,” says Narasimhan. There were many previous studies that tried to connect the pelvic structure quickly walking and efficiently, for example, but these studies usually involve small numbers of people and produced conflicting results.

Now, Narasimhan and his colleagues used data from the UK biological bank to consider 31,000 men and women. The team measured various aspects of the sink based on a type of examination called the absorption of X -rays with dual energy and searched for links with genetic differences and people’s aspects healthLike the emergency request.

The results indicate that the presence of the broader basin reduces the risk of complications during childbirth, but it leads to a slower walk and a higher risk than the conditions associated with the pelvic floor and the bone hip arthritis. Meanwhile, the narrower pelvis may accelerate walking, but it increases the risk of complications from birth, back pain and knee arthritis.

I have already suggested that there is a link between the presence of narrower hips and previous births, to reduce the risk of complications of birth, but the team did not find any connection between the pelvic width and the length of pregnancy. “This is in line with other studies that shows that human children are not born [relatively] “Urgently what it was in the other great monkeys,” says Narasimhan.

The team noted a relationship between the pelvic width and the size of the children’s head at birth. “Individuals who may generate children who have a broader head often have a broader basin,” says Narasimhan. “This happens due to natural selection, as we constantly choose for individuals who have this association.” This choice Maybe it is over now Because of the sections C, he claimed a 2016 study.

Another discovery is that most people have a somewhat asymmetric sink connected to their hand. Narasimahn says that the left or the right hand usually determines the dominant leg, which affects walking and developing the pelvis, and this may lead to a slight inconsistency with our growth.

“This is an extraordinary contribution to an essential aspect of human evolutionary biology,” he says, “he says. Scott Simpson At the University of Western Reserve in Cleveland, Ohio. “By integrating anatomical, genetic, clinical and behavioral data, the authors provided great visions in this unique human adaptation.”

“It is good to be able to exploit large data collections,” he says. Nicole Web At Zurich University in Switzerland, which showed this The birth channels of chimpanzee are not much broader than the people of the people. Webb notes that all people in the data group were over 40 years old and from the United Kingdom. “If this work is carried out on the younger and more diverse population, the results may be more surprising,” she says.