The limit on a person’s running speed may not be due to the strength of his bones and tendons. A 2010 study found that this limit lies in stride, namely the speed at which we can retract our feet and move forward while still having time to kick our feet down to the ground.
Dr. Peter G. Weyand, a biomedical researcher and physiologist at Southern Methodist University in the United States, and one of the authors of the aforementioned study, said our running speed is limited because most of our stride is in the air. In the moments when our feet touch the ground, we must use too much force.
"If there is a mechanical limitation of two-legged animals, it is the minimum time for the feet to come into contact with the ground," he said. A person who runs very fast like athlete Usain Bolt, touches the ground about 42 or 3% of the time of stride. But four-legged animals, like a horse or a cheetah, two-thirds of the time on the stride is on foot.
During landing, our feet must push forward and push our bodies upwards to resist gravity, which is too much force to use in a short time and that’s why I People can slide faster than running. When sliding, most of the time we are on the ground instead of in the air. Keeping the sliding table always on the ground helps lift the body during the slide, so that the legs can support a part of the burden.
Dr. Weyand said that if given four options "redesign" the human body to run faster: longer legs, wider hip bones, more legs or legs with more kink points, then he gives that the leg has more kink points, or the extra knee is the least effective way. Having more knees helps us spread our legs wider for longer contact with the ground. But if the legs are too far from the lower body, it is difficult to generate enough thrust against gravity. This option and the broader hip bone approach are both ineffective.
Longer legs will work. That is why ostriches run much faster than us. But the most effective solution is probably to have more legs. If we have more legs, we may have one or two feet that always touch the ground, like 4-legged animals when running.
"The bottom line is that there is more total time to touch," Dr. Weyand said. All of the group’s experiments have shown that this physical principle holds true for all devices, whether devices, four-legged animals, two-legged animals, or artificial limbs. So if you want to run fast, you can use magic to turn yourself into a centaur.
Of course, humans can run with both hands and feet without any miracles. The world record for running 100 meters with both hands and feet in 2008 was 18.58 seconds and 2015 was 15.71 seconds.
From such a pace of speed over time, the researchers extrapolated and made predictions in a scientific paper that by 2048, people who run on both hands and feet will run faster than humans. run only by 2 feet. What a daring prediction. If you can’t find any magic, you can still try running with both your hands and both hands.
