Su Shen started to explode.
This time.
Faster than everyone imagines.
After the above set is done, Su Shenqu’s arm is activated.
First.
Reduce moment of inertia.
The moment of inertia is related to the mass distribution of the object and the position of the axis of rotation.
When the bent arm starts, the arm bends to make part of the mass close to the body's rotation axis, reducing the moment of inertia of the upper limbs.
According to the law of conservation of angular momentum L = Iw (angle moment of inertia = moment of inertia x angular velocity), when the angular momentum is constant, the moment of inertia I decreases, and the angular velocity w will increase, that is, the arm can swing faster.
Provide more help for body forward movement.
second.
Utilize angular momentum transmission.
At the beginning, the movements of various parts of Su Shen's body are related to each other. The angular momentum generated by the swing of the arm can be transmitted to the lower limbs and trunk through the movement chain of the body, so that the whole body can gain forward momentum.
In addition, the extension of the shoulder joint power arm can transmit the angular momentum of the arm swing more effectively, converting it into the body's forward translation kinetic energy, and also improve the starting acceleration effect of starting.
This is done for the next key.
Su Shen should prepare for the breakthrough application of angular momentum conservation.
Gunshot.
start up.
Step out!
Moment of inertia adjustment!
In the state of curved arm 2.0, the mass distribution of the upper limb is closer to the central axis of the body, and the moment of inertia is reduced by 37%.
This is derived from the rotational moment of inertia formula I = Σmr², that is, the value of r decreases. When the arm is bent, the distance between each part of the upper limb to the rotation axis, that is, the shoulder decreases, and the rotational moment of inertia I decreases accordingly.
According to the angular momentum formula L = Iw, it can be seen that when the angular momentum is certain, the athlete can be regarded as a roughly stable demand at the start to ensure an efficient start. Then, the moment of inertia I decreases and its angular velocity w can increase.
This means that athletes can swing their upper limbs at higher frequency.
Up to 5.8Hz.
The increase in the swing frequency of upper limbs can drive the body's rhythm more quickly and coordinate the movements of lower limbs, thereby gaining greater forward momentum during the starting stage.
Next is the time to go out.
Su Shen did swing phase adjustment.
At the moment of striking off the starting device, the reverse swing arm is activated, which utilizes the vector nature of angular momentum.
But this is not unusual, the key is how you should make good use of this vectorism.
Angular momentum is a vector, and its direction follows the right-hand spiral rule. Then when an athlete kicks off the starting device, the lower limbs will produce a forward impulse to make the body obtain forward speed, and at the same time, it will also produce a tendency to rotate the body around the center of mass, corresponding to an angular momentum.
At this time, the reverse swing arm is activated, and the angular momentum generated by the swing arm is opposite to the angular momentum generated by the lower limbs pushing the ground to make the body rotate.
The law of conservation of angular momentum is written.
These two angular momentums with the same magnitude and opposite directions cancel each other out, which can play a role in angular momentum compensation.
This will enable the athlete's body to maintain better balance and move forward in a straight line at the moment of starting.
Reduce energy lost due to body rotation and improve starting efficiency.
Of course, the premise is.
You have done the moment of inertia adjustment first.
Before adjusting the moment of inertia, the core muscle group coupling, upper limb stiffness adjustment, shoulder joint dynamic arm extension, etc.
Otherwise, it will be useless.
This is why the subsequent improvements require athletes to have relevant knowledge themselves.
Because there are more and more interdisciplinary knowledge.
Not everyone is Bolt.
If you don’t understand, you can rely on your physical talent to understand.
Su Shen is truly using multidisciplinary intersections to make its own technical modifications and breakthroughs.
The moment of starting.
Plus upper limb swing control.
This is also to better utilize angular momentum, moment of inertia and angular velocity. It is known that in physics, the magnitude of angular momentum is related to moment of inertia and angular velocity, and angular momentum L = Iw, where I is moment of inertia and w is angular velocity.
When an athlete swings his upper limbs, angular momentum will be generated. If the range of motion of the shoulder joint is too large, it means that the radius of the swing arm increases. According to the formula I = Σmr², r is the vertical distance from the particle to the rotation axis. If r increases, the moment of inertia increases. When the swing angular velocity remains unchanged, the angular momentum generated will increase.
this.
It's what Su Shen did now.
Relying on the law of conservation of angular momentum shows that the total angular momentum of an isolated system remains unchanged.
In the short-term starting system, if the upper limbs produce too much angular momentum, in order to maintain the conservation of the total angular momentum, it may interfere with the force of the lower limbs and forward movement, resulting in energy dispersion, which is not conducive to athletes' rapid start.
This is why Su Shen weakens the non-special muscles of the upper limbs.
Anyway, it's now.
That is definitely linked.
Not like the beginning, a simple change.
You can make progress.
later.
Becoming more and more refined.
More and more scientific.
More and more cross.
Will be the norm.
Su Shen limits the shoulder joint movement range to ±25° here to effectively control the angular momentum generated by swinging of the upper limbs.
Avoid excessive consumption of angular momentum and allow more energy to be concentrated on the lower limbs to push the body forward.
All of these can be done, which can make the contraction and relaxation of upper limb muscles more efficient when the arms are bent, and the recruitment and force mode of muscle fibers are more conducive to rapid swing.
For example now.
Sushen biceps, triceps, etc. can work better together in the bent arm state, and the power generated can be converted into the swinging kinetic energy of the upper limbs more directly.
Then, the muscles are connected through the shoulders, back, core to hips, and lower limbs. The energy generated by swinging of the upper limbs can assist the lower limbs in better completing the ground-pushing movement.
This improves the efficiency of energy utilization and makes the overall startup performance better.
So it's also a step forward.
The first step is that Su Shen relies on the high frequency swing of the bent arms to help him quickly adjust his body posture and center of gravity during the starting stage.
This is because during the acceleration of the starting and the stability of the body's posture and center of gravity are very important to maintain linear acceleration. The swing of the upper limbs can be used as a balance adjustment mechanism to help athletes cope with various power changes at the beginning.
This scene.
Su Shen this year.
Excellently done.
Completely surpassed before.
Totally surpassed last year.
Bang!
Level component increase!
In the decomposition of force, according to F_x = Fxcosθ, the rear pedal force F can be decomposed into horizontal component force F_x and vertical component force F_y. When the rear pedal angle θ drops from 50° to 42°, the value of cosθ increases, which means that the proportion of horizontal component force in the total rear pedal force increases, which can provide athletes with greater horizontal forward momentum, so that the body can obtain greater horizontal acceleration at the moment of starting, and is more conducive to rapid forward sprinting.
Vertical component loss and compensation!
Although the current reduction in the rear pedal angle will cause a loss of the vertical component F_y = Fxsinθ, don't forget that the running gait of the human body is a continuous process.
In subsequent gaits, Su Shen can appropriately adjust and supplement the vertical force through other stages of movement, such as the active forward swing of the swing legs, the buffering and thrusting when landing, etc., to maintain the body's balance and forward motion trajectory, and ensure the stability and efficiency of the overall movement.
Connect the four points after landing!
ankle, knee, hip, shoulder.
All in the same frequency!
This way you can...
Maximize impulse integral score!
The impulse J =∫Fdt, which represents the accumulation effect of force in time. According to Sushen’s experiment, the maximum impulse integral value at the 42° rear pedal angle is about 230N·s, because at this angle, factors such as the increase of horizontal component force and the action time of force have reached an optimal equilibrium state.
This 42-degree rear pedal angle.
This is the new changes that Su Shen has made this year!
Because.
Maximizing the impulse integral point value can make the four-point connection of Su Shen more powerful.
The four-point connection line is stronger, which means...
The output of the hip extensor group will be improved!
At this angle, Su Shen released power of 2800W in the pedal and extension stage, and the hip extensor groups such as the gluteus maximus, biceps femoris, etc. within 50ms, which is due to the contraction characteristics of the muscles and the regulation of the nervous system.
Its nervous system will quickly recruit a large number of motor units, causing the muscle fibers of the hip extensor group to contract rapidly in a synchronous manner, generating huge power in a short period of time, thereby outputting high power and providing powerful power for the rear pedal.
Not finished yet, then...
It can release the elastic energy storage of tendons explosively!
Tendons such as Achilles tendon have good elasticity. In the early stage of stretching, part of the energy generated by muscle contraction will cause the Achilles tendon to undergo elastic deformation and store it.
When the rear pedal reaches a certain stage, the Achilles tendon will rebound quickly, release the stored elastic potential energy explosively, superimpose it with the force generated by the active contraction of the muscles, further increase the rear pedal force, increase the power output of the hip joint, and help athletes obtain greater acceleration at the moment of starting and achieve faster start.
The above changes.
It is to better release the elastic energy storage of the tendon!
This step is actually outrageous.
Although Su Shen’s reaction was not the fastest, it was not slower now, 0.137s, steadily.
So what if Bolt was created by Mills for a new bipedal pressure center migration trajectory?
So what if Mills arranged better joint torque power for Bolt?
Even if Bolt's hamstring centrifugal-centripe contraction conversion efficiency reaches 0.85-0.92, which is significantly higher than that of ordinary athletes...
So what?
All of this was expected by Su Shen.
Nothing beyond expectations.
Besides, Bolt is still too tall and cannot exceed the body's straight arm drive limit without a bent arm start.
Then that is.
Although it has improved, it still cannot even compare to Carter's start after the breakthrough.
That's the case.
How could it be possible to fight Su Shen?
Because even if the four-point asymmetric support of both knees and hands is used to reduce the center of mass of Carter.
Now.
They are all completely inferior to Su Shen.
Even if the pressure center is preset, it is still blown by Su Shen’s swinging phase adjustment.
So.
What else can I fight with Su Shen?
Precise joint angle control?
Can you withstand the adjustment of Su Shen’s moment of inertia?
Yes Yes.
Carter has taken all these steps very well.
What is the front leg knee angle of 105°-110° to avoid excessive flexion and delayed centrifugal contraction of the quadriceps femoris.
What is the hind leg knee angle of 130°-135° to maximize the elastic potential energy reserve of Achilles tendon.
What is the dorsiflexion angle of the ankle joint, 25°±2° for the forefoot and 15°±2° for the rear foot, and "preloading" is achieved through precontraction of the plantar flexor muscle group.
All are very good.
It has indeed greatly improved its startup ability.
that is……
There are different levels between people.
Then between technology and technological changes.
Of course there will be grading.
Carter and Bolt both made good changes.
They also took the path of scientific optimization of their own activation.
They are all on a new path of scientificization.
that is……
When they just started riding their bikes on this road.
Su Shen.
Already on this road.
Started a supercar.
No.
Now it's racing.
Bang!
Step 2.
Su Shen strongly suppressed Bolt and Carter!
The long-awaited startup burst.
That's now.
All the previous ones lay the foundation for this place.
Of course, this is just a node.
But this node.
It's a big node.
Su Shen’s plateau competition optimizes its horizontal component and vertical force.
It's all for this big node.
Make your body feel this way in advance.
certainly.
It is not easy to display it on the plain.
It doesn't matter.
It is not easy to do well on the plains.
Aerodynamics is also harder to control than plateaus.
but.
There are also times when it is easy to display on the plains.
For example.
Big wind gun.
Especially for games like this one.
After the wind speed reaches a limit.
Some operations that are not that easy to do in plains.
Not so easy to accumulate experience.
It's OK, too.
Show it.
This is why Su Shen chose this game.
It's because.
He had known about this shot for a long time.
A group of winds are very high.
This chapter is not over, please click on the next page to continue reading! Bang!
Step 3.
After Su took out, his three golden steps were over.
At this time, Carter and Walter are still in the startup stage.
Su Shen used the help of a large wind gun to exert scientific wind control technology.
Put some of the startup feelings you found on the plateau.
Includes the feeling of horizontal component and vertical force.
They all spread directly on the plain.
Under the strong wind.
impossible.
Become possible.
Explosive output of hip extensor group!
Positive elastic energy storage explosive release!
Su Shen quickly.
At a much faster speed than before.
He lifted his body into the acceleration position.
It just seems a little bit changed.
But Su Shen paid so much technical research price.
This is why Su Shen said again and again in his previous life that the future sprinting is a technical exercise.
Because I want to make a breakthrough in the future.
It just needs more breakthroughs in combining science and technology.
The possibility of breakthroughs based on experience and talent alone.
Getting lower and lower.
There is less and less space.
This is the right way for Su Shen.
After Su Shen entered the acceleration position faster than before.
Whole person.
Leverage the wind.
At a nearly crazy speed.
Rush out.
Bang bang bang bang bang bang.
Four consecutive steps.
Every step.
They are all visible at a speed that is visible to the naked eye.
promote!
promote!!
promote!!!
Every step.
Everyone is pulling Carter away.
Every step.
They are all pulling out Bolt.
Even these two guys who claim to have made a big breakthrough this year.
They are proud of starting a breakthrough.
It's here.
All are here.
At Hayward Stadium.
Being this fiery red figure.
It was easily torn in half.
Su Shen rushed out of the middle of the two of them easily.
This speed.
It's almost to an unimaginable level.
Even Powell was watching the game.
They almost fell in front of them.
Stand up immediately.
Powell started this year.
In fact, it has also made certain breakthroughs.
He himself was quite proud and proud.
But what about now?
Under this fiery red figure.
Become so ordinary.
It seemed as if everything was boring.
horrible……
This shot starts.
want……
Super amazing.
ps: The update is still a big chapter, hehe.
Dear guys, I've had a rest.
Chapter completed!