Ersha Island.
In fact, Liu Xiang really wants to hear how the best sprinters in the world conduct daily winter training.
But as he listened, he felt...
Still slipped away.
In the mouths of these people...
There is no "human talk" at all.
What is "the late stage of landing buffer", what is "the projection point of the human body's center of gravity", what is "the hip joint muscles are restrained contractions", what is "the horizontal component of the support reaction force generated by the contraction force acting on the ground through the support foot is increased"... this and this He knew what each word meant when taken apart, but when combined, he became more and more confused.
Moreover, their discussion was in full swing, and Liu Xiang didn't even notice Liu Xiang sneaking past him again and again.
"It's still the impact of the landing distance on human body movement." Su Shen pointed to an angle of the screen and said: "The landing distance refers to the distance between the foot landing point and the vertical line of the body's center of gravity. The traditional model in our country was due to the front pedaling. The support reacts with a kind of resistance. To reduce the resistance, you can achieve running speed. In other words, you must increase the angle of the front pedal angle and shorten the distance between the foot landing point and the vertical line of the body's center of gravity. But now this has been proven There is a problem." Su Shen drew a big cross on the whiteboard next to him and continued: "From the technical perspective of landing buffering, the increase in landing distance prolongs the deceleration stage in the early stage of landing buffering, which should be detrimental to Give full play to running speed. But sprinting is a whole. If you consider the short term, this is indeed the case, but if you consider the entire 100 meters, are there other discoveries?"
"So the answer is?" Randy and Su Shen no longer have the previous model of teachers teaching disciples, but have now become the same one-on-one equal communication model as Su Shen.
This change in the identity of both parties is enough to prove a lot of things.
"Yes." Su Shen nodded: "The research from our Su Shen laboratory is as follows. Although it seems to be damaged in the short term, from the perspective of the entire running cycle, the increase in the landing distance of elite athletes not only increases the stress on the hip joint Restraining the degree of contraction also increases the degree of concession and contraction of the knee and ankle joints, increases the range of motion of the knee and ankle joints, and reserves energy for the back pedal, which is most conducive to the development of favorable stride frequency and stride length."
"This is some landing data of American athletes in the 1990s. Although it is analyzed through old videos and is a bit blurry, it can still be roughly restored using modern technology. This is the landing data of us Asians. Did you see it? Our landing data is obvious It is much different than the comparison. The reason for this is not only the backward concept and technological level, but also the physical fitness that I have been talking about. Without physical fitness as a guarantee, you cannot be in the technical cycle of running. Properly increasing the landing distance during the front pedaling phase will not easily extend the landing buffer time.”
"I see, we are completely going the wrong way in this regard." Zhao Haohuan nodded after hearing this. He was no longer so surprised by Su Shen's various knowledge accumulation abilities, and it even gradually became a matter of course.
If Su Shen knows, it's not strange. If Su Shen doesn't know, that's strange.
"But we have tried, but the results are not particularly good. Is it because you Asians can do Asian squats, but Omi people can't do Asian squats? Is it a physiological problem?" Randy also touched his chin and said expressed his own opinion.
Omi people don't know that Asian squats are easy, but for ordinary people, if athletes are flexible and have sufficient joint mobility, Asian squats are still not a problem. To put it bluntly, these are all things that can be put into use after the body's door is further opened through training. It does not mean that Omi people can't do it no matter how hard they train throughout their lives. But Su Shen doesn't think this issue lies here, saying: "I think the structural, functional characteristics and strength of the ankle joint have a greater impact on ground cushioning."
"Modern science has proven that the structural and functional characteristics of the ankle joint are of great significance to running ability. Because the structural and functional characteristics of the ankle joint include: the role of the size of the talus, the elastic deformation ability of the triceps surae, etc., and at the moment of landing on the ground to cushion the , when the forefoot of the swinging leg touches the ground in a scraping manner, due to the forward and downward inertia, the forefoot quickly transitions to the full sole. When the instep bends to a certain extent, if the athlete's talus is relatively large or the talus is If the position is relatively high from the sole of the foot, or the elastic deformation ability of the triceps calf tendon is relatively strong, it should theoretically be able to reduce the dorsiflexion of the ankle joint, forcing the sole of the foot to begin to transition from a full sole to a 'credit card' when landing. After all, on the premise of ensuring sufficient buffering action, shortening the buffering time and speeding up the buffering speed is one of the functions of the 'credit card landing technique'. At the same time, the elastic deformation of the triceps surae can store energy and use non-metabolic energy for the ankle joint to work. , it is of great significance to improve the efficiency of pushing off the ground and improving the efficiency of running. Then I think our subsequent training focus must be on conquering this technology, and we must first focus on the ankles and triceps calves."
"Because of the contraction force of the ankle joint, it is also very important for the correct completion of the grounding technique. At the moment of landing, the swing leg actively swings backward and downward, forming the forefoot of the swinging leg to quickly land on the ground. If the muscle contraction force of the ankle joint is large, you can increase the force of the forefoot to push the ground backward, reduce the horizontal speed of the foot at the moment of landing, increase the angle of the front pedaling angle, and buffer the horizontal braking force of the ground facing the human body. The supporting leg's foot can quickly switch from full-foot support to 'credit card support', which can definitely shorten the buffering time while ensuring sufficient cushioning."
"There is also this aspect that I think has reference significance." Su Shen clicked on another computer screen and said: "The latest research report from our laboratory, as we all know, in muscle mechanics, muscles are divided into three parts: contraction elements , series elastic element, parallel elastic element. When the muscle contracts, the contraction element first contracts to generate tension. At this time, no increase in force can be measured at the outer end of the muscle. Then, the shortened contraction element pulls the series elastic element. Long. Only when the series elastic element is stretched to a sufficient length can the change in force be measured at the end of the muscle. In that case... look at this."
"Leg flexor muscles become electrically active 15-20 ms before foot strike."
"What does this suggest? It suggests that the motor neuron sends a pulse to the muscle earlier than the moment of landing, before the muscle has time to contract, and the length of the muscle that is activated is less than the equilibrium length."
"When it comes to landing, the reaction force on the ground that the foot receives at the moment of landing is resistance, but this process plays a positive role in completing the entire movement. And because the back pedal is the foundation of the forward movement, the force of the back pedal should be the forward swing. The continuation of landing force, and cushioning is the prelude to kicking off. Cushioning is essentially the braking of the body's movement in the direction of support, and cushioning can pre-stretch the muscles to the optimal initial length, thereby storing elastic energy and preparing for the back kick. According to the traditional analysis of the biomechanical characteristics of ground cushioning, starting from the time when the foot touches the ground and ending when the projection point of the body's center of gravity moves to the top of the landing point, it is not noticed that the human body is in rapid motion during sprinting, and the foot supporting the leg is in front of the ground. The sole of the foot turns to full foot support, and then the heel turns to forefoot support, etc. Therefore, it is impossible to further understand the phenomenon of deceleration and acceleration of the human body during landing cushioning.”
"I didn't pay too much attention to what you said." Randy seemed to have realized something. Something that still bothered him had been "tickled" by Su Shen, and he immediately asked: "So what can we do to further realize this?" Woolen cloth."
It’s no wonder that Randy is not clear about it, mainly because at this time, there is not much research on landing cushioning, and it has not been broken down yet.
But after 2020, the breakdown has begun to become clearer.
"Furthermore, in order to reveal this problem, our laboratory divided the sprint landing buffering process into the early buffering period and the late buffering period. They are based on the position phase of the projection point of the body's center of gravity and the heel as the criterion."
"Divide the early and late stages?" Randy continued to ask: "Then, how to divide."
"From the moment the foot touches the ground to the time when the body's center of gravity moves vertically above the heel, this is called the early buffering stage. At this time, the body's center of gravity is behind the support surface, and the horizontal component of the support reaction force is opposite to the direction of human body movement, and affects the forward direction of the human body. The movement acts as resistance, and the human body decelerates. From the point where the center of gravity of the human body is vertically above the heel to the vertical position above the landing point, it is called the buffering period. The main driving force for the human body to accelerate in the buffering period after landing comes from the action of swinging legs. Swing upward in advance and the supporting leg move in opposite directions, and the supporting leg acts on the ground, so that the human body obtains the maximum support reaction force."
"Can it still be like this? Damn it, why didn't I think of it?" Randy's eyes seemed to light up after hearing this, and he wished he could slap his forehead and slap him to death: "It's a pity that Ralph Mann is taking care of Liu Fajian, otherwise, this would have happened A new wave of conceptual divisions will definitely make him, a biomechanics expert, ecstatic."
"Then let's build a new chain model for the lower limb landing link." Randy said: "The existing one has serious shortcomings and needs to be modified."
"This model needs to be calculated and sufficient. It may take a week or two..." As soon as Randy finished speaking, Su Shen waved his hand and said, "No, I will just sort it out during my lunch break. I will bring it when I come over in the afternoon." .”
Randy:…
What the hell.
Although he knows that Su Shen is a "research monster", but relying on the current high-tech system requires several weeks, he said that he can do it in one lunch break... Is this really a human being?
However, he is the "thesis output machine" in the sports field of this era and the "absolute pioneer of technological innovation" in this era. Thinking of this, Randy can only feel his heart and have to calm down a little.
Because there is absolutely no need to compare.
After Su Shen has created countless theoretical innovations, he is already one of the true gods of track and field theory in this era.
He had seen with his own eyes that Marlon Burke, an arrogant old guy, almost recognized his "godson" when he faced Su Shen.
However, I came to Ersha Island for more than a year and less than two years, and I actually learned things faster, more, and more systematically than I did during my previous growth period. Thinking about it, I don’t know whether it was earned by others or by myself. .
"But it's still difficult to use it in curves." Su Shen also thought for a moment, frowned slightly and said: "Because when running in a curve, the human body moves relatively slowly and the movement posture is in the direction of the curve. The inside of the tunnel is tilted, forming a curve where the foot of the inside leg is supported by the outside of the forefoot, and the foot of the outside leg of the curve is supported by the inside of the forefoot. If the entire foot touches the ground or a credit card lands on the ground, it will inevitably cause the talus and support of the foot of the supporting leg. The morphological characteristics of the tibial contact surface of the leg change. Therefore, when the human body is running on the ground to cushion the curve, athletes with good ankle joint strength have relatively more forefoot support; while athletes with poor ankle joint strength have limited support ability. There are relatively many situations where the whole foot is on the ground for support. If I can optimize this aspect in the future so that it can also be used in corners, then my overall strength in corners will definitely improve again."
"When the time comes to face that Zenith star, I will have more confidence."
Randy:…
Zhao Haohuan:......
Randy was once again shocked that Su Shen didn't just want to understand this "credit card technology". He wanted to optimize and innovate again based on the original foundation.
Just saying.
How could this kid be so idle? Every technology in his hands would be either upgraded or optimized.
Even the latest "credit card landing" is still in the research stage by the Americans themselves, and they have already begun to work hard towards version 3.0 or even 4.0 and 5.0.
It's simply a perversion.
When I'm with him, I don't even dare to say that I'm a "sports research coach."
And Zhao Haohuan was shocked.
This guy Su Shen actually...
Still thinking about having a showdown with that monster Bolt.
and.
Still on the most unlikely bend.
After seeing Bolt's terror, he still felt that he wanted to challenge him from the bottom of his heart. He was not a talkative person. Zhao Haohuan felt...it was really terrifying.
Anyway, I, or the entire track and field world, were "shaken" because of Bolt's emergence.
Only him.
The heart of Tao is stable.
Nothing has changed at all.
With this kind of mind, the further he goes, the more Zhao Haohuan feels that Su Shen is "exaggerating". This is an understanding that cannot be achieved when the strength is not strong enough.
"Okay, let's get started and solve the ankle energy problem first."
"Step by step, you try to understand it as soon as possible."
Um? Isn’t that right, you guys? Isn't it us?
"Then, when are you going to get it done?" Zhao Haohuan asked cautiously, although he regretted it as soon as he asked it.
"Ah? I'll see if I can get it done next month. If it's done, just use me to do research on the human model. I'll definitely get twice the result with half the effort."
Next, next month...
Zhao Haohuan really wanted to slap himself.
Why don't you learn to make pancakes? You're so damn curious.
Time passed in the blink of an eye, and soon 2008 came to the New Year.
The bell of 2009 is coming.
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