The Su God of the Reopening of the Sports Arena

Chapter 2155 Anyway! No one is faster than me!!! (Add more to ask for votes!!!)

Su Shen started to explode.

This time.

Faster than anyone imagined.

After completing the above set, Su Shen bent his arms and started.

the first.

Reduce the 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 starting with a bent arm, the bent arms bring part of the mass closer to the body's axis of rotation, reducing the moment of inertia of the upper limbs.

According to the law of conservation of angular momentum L = Iω (angular momentum = moment of inertia × angular velocity), when the angular momentum is constant, the moment of inertia I decreases and the angular velocity ω increases, which means that the arm can swing faster.

Provide more assistance for moving the body forward.

second.

Utilize angular momentum transfer.

When starting to run, the movements of various parts of Su Shen's body are interconnected. The angular momentum generated by the swing of his arms can be transferred to his lower limbs and trunk through the body's kinematic chain, giving the whole body forward momentum.

In addition, by extending the power arm of the shoulder joint, the angular momentum of the arm swing can be transmitted more effectively and converted into forward translational kinetic energy of the body, which also improves the starting acceleration effect.

Doing this is for the key that follows.

Su Shen needs to make preparations for the breakthrough application of the conservation of angular momentum.

Gunshots.

start up.

Take a step forward!

Moment of inertia adjustment!

In the bent arm 2.0 state, the mass distribution of the upper limbs is closer to the central axis of the body, and the moment of inertia is reduced by 37%.

This is derived from the moment of inertia formula I = Σmr, that is, as the r value decreases, the distance from the various parts of the upper limbs to the rotation axis, i.e. the shoulder, decreases when the arms are bent, and the moment of inertia I decreases accordingly.

According to the angular momentum formula L = Iω, we can know that when the angular momentum is constant, the athlete can be regarded as having a roughly stable requirement for the total angular momentum when starting to ensure an efficient start. Then, if the moment of inertia I decreases, the angular velocity ω can be increased.

This means that athletes are able to swing their upper limbs at a higher frequency.

The highest can exceed 5.8Hz.

The increase in the swing frequency of the upper limbs can drive the body's rhythm faster and coordinate the movements of the lower limbs, thereby obtaining greater forward momentum at the starting stage.

The second time I went out.

Su Shen made a swing phase adjustment.

At the moment of pushing off the starting blocks, start the reverse arm swing, which utilizes the vector nature of angular momentum.

But this is not surprising. The key is how you make good use of this vector property.

Angular momentum is a vector quantity, and its direction follows the right-hand screw rule. So when the athlete pushes off the starting blocks, the lower limbs will generate a forward impulse that makes the body gain forward speed, and at the same time, it will also generate a tendency to rotate the body around the center of mass, corresponding to an angular momentum.

At this time, start the reverse arm swing, and the direction of the angular momentum generated by the arm swing is opposite to the direction of the angular momentum generated by the lower limbs pushing off the ground to rotate the body.

The law of conservation of angular momentum is written here.

These two angular momentas of equal magnitude and opposite direction cancel each other out, thus achieving the effect of angular momentum compensation.

This allows the athlete's body to maintain a better balance and move forward in a straight line at the moment of starting.

Reduce the energy lost due to body rotation and improve starting efficiency.

Of course, the premise is.

You first make the moment of inertia adjustment.

Before completing the moment of inertia adjustment, we also completed the core muscle coupling, upper limb stiffness adjustment, shoulder joint power arm extension, etc.

Otherwise, it will be in vain.

This is why subsequent improvements require athletes to have relevant knowledge themselves.

Because there are more and more interdisciplinary subjects.

Not everyone is Bolt.

Even if you don’t understand, you can rely on your physical talents to comprehend.

Su Shen is truly utilizing multidisciplinary cross-disciplinary approaches to make his own technical modifications and breakthroughs.

The moment of starting.

Plus upper limb swing control.

This is also to make better use of angular momentum, moment of inertia and angular velocity. It is known in physics that the magnitude of angular momentum is related to moment of inertia and angular velocity, angular momentum L = Iω, where I is moment of inertia and ω is angular velocity.

When an athlete swings his upper limbs, angular momentum is 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 moment of inertia formula I = Σmr, r is the vertical distance from the particle to the axis of rotation. If r increases, the moment of inertia increases. If the swing angular velocity remains unchanged, the angular momentum generated will increase.

This.

That’s what Su Shen is doing now.

The law of conservation of angular momentum shows that the total angular momentum of an isolated system remains constant.

In the sprint start system, if the upper limbs generate too much angular momentum, in order to maintain the conservation of total angular momentum, it may interfere with the force and forward movement of the lower limbs, resulting in energy dispersion, which is not conducive to the athlete's quick start.

This brings us back to the reason why Su Shen wants to weaken the non-specialized muscles in the upper limbs.

Anyway, until now.

It's definitely interconnected.

Not like at the beginning, a simple change.

You can make progress.

Behind.

More and more refined.

More and more scientific.

More and more crossover.

Will be the norm.

Here, Su Shen limits the range of motion of the shoulder joint to ±25° in order to effectively control the angular momentum generated by the swing of the upper limbs.

Avoid excessive consumption of angular momentum and concentrate more energy on the lower limbs to push the body forward.

Once all of these are done, the contraction and relaxation of the upper limb muscles when bending the arms can be more efficient, and the recruitment and force generation patterns of the muscle fibers can be more conducive to rapid swinging.

Such as now.

Su Shen's biceps, triceps, etc. can work together better when the arms are bent, and the force they generate can be more directly converted into swinging kinetic energy of the upper limbs.

Then through the shoulders, back, core, hips, and lower limb muscles, the energy generated by the upper limb swing can assist the lower limbs in completing the ground-pushing action better.

This improves energy utilization efficiency and makes the overall startup performance better.

So it’s also a step forward.

In the first step, Su Shen relied on high-frequency swinging of his arms to help himself quickly adjust his body posture and center of gravity during the starting phase.

This is because during the starting acceleration process, the body posture and center of gravity stability are very important to maintaining linear acceleration. The swing of the upper limbs can be used as a balance adjustment mechanism to help athletes cope with various force changes during the start.

This scene.

Su Shen this year.

Excellent job.

Completely surpassed the previous one.

Completely surpassed last year.

boom!

Horizontal force increased!

In the force decomposition, according to F_x = F×cosθ, the back-pedal force F can be decomposed into the horizontal component F_x and the vertical component F_y. When the back-pedal angle θ decreases from 50° to 42°, the cosθ value increases, which means that the proportion of the horizontal component in the total back-pedal force increases, which can provide athletes with greater horizontal forward power, so that the body can obtain greater horizontal acceleration at the moment of starting, which is more conducive to sprinting forward quickly.

Vertical force loss and compensation!

Although the reduction in the back-pedal angle will cause some loss of the vertical force F_y = F×sinθ, don't forget that the running gait of the human body is a continuous process.

In the subsequent gait, Su Shen can appropriately adjust and supplement the vertical force through actions in other stages, such as the active forward swing of the swinging leg, cushioning and extension when landing, etc., to maintain the balance of the body and forward movement trajectory, and ensure the stability and efficiency of the overall movement.

Connect the four points after landing!

Ankle, knee, hip, shoulder.

All on the same frequency!

This way you can...

Maximize the impulse integral value!

Impulse J = ∫Fdt, which represents the accumulated effect of force over time. According to Su Shen's experiment, the maximum value of the impulse integral at a 42° back-pedaling angle is about 230N·s, because at this angle, the increase in the horizontal component force and the time of force action have reached an optimal balance.

This is a 42-degree kickback angle.

This is Su Shen’s new change this year!

Because.

Maximizing the impulse integral value can make Su Shen's four-point connection more powerful.

The four-point connection is stronger, which means...

The output of the hip extensors increases accordingly!

At this angle, during the extension phase of Su Shen's push-up, the gluteus maximus, biceps femoris and other hip extensor muscles release a power of 50W within 2800ms. This 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 and synchronously, generating huge force in a short period of time, thereby outputting high power and providing strong power for the back kick.

It’s not over yet, next is…

It can release the elastic energy stored in the tendon explosively!

Tendons such as the Achilles tendon have good elasticity. In the early stage of extension, part of the energy generated by muscle contraction will cause the Achilles tendon to undergo elastic deformation and be stored.

When the back-pedaling reaches a certain stage, the Achilles tendon will rebound quickly, releasing the stored elastic potential energy explosively, which is superimposed with the force generated by the active contraction of the muscles, further increasing the back-pedaling force and improving the power output of the hip joint, helping athletes to achieve greater acceleration at the start and a faster start.

The above changes.

It is to allow the tendon's elastic energy to be better released!

This step is actually outrageous.

Although Su Shen’s reaction was not the fastest, it was not slow now, 0.137s, keeping the pedal steady.

So what if Mills created a new migration trajectory for Bolt's foot pressure center?

So what if Mills gave Bolt better joint torque power?

Even if Bolt's hamstring eccentric-concentric contraction conversion efficiency is 0.85-0.92 at this time, which is significantly higher than that of ordinary athletes...

so what?

All this was within Su Shen's expectations.

Nothing beyond the expected.

Besides, Bolt is too tall after all, and without bent-arm starting, it is impossible for him to exceed the straight-arm drive limit of his body.

So that is to say.

Although it has improved, it is still not as good as Carter's start after the breakthrough.

That being the case.

How is it possible to fight against Su Shen?

Because even if Carter adopts the asymmetric four-point support start with both knees and hands, his body center of mass is lowered.

just now.

They are all completely inferior to Su Shen.

Even the pressure center preset was destroyed by Su Shen's swing phase adjustment.

Then.

What else can I use to compete with Su Shen?

Precise control of joint angles? Can it withstand Su Shen's moment of inertia adjustment?

Yes Yes.

Carter has made good progress in these steps.

The front leg knee angle is 105°-110° to avoid excessive flexion which leads to delayed eccentric contraction of the quadriceps.

The hind leg knee joint angle is 130°-135° to maximize the elastic potential energy reserve of the Achilles tendon.

What is the ankle dorsiflexion angle? The forefoot is 25°±2°, and the hindfoot is 15°±2°. The "preload" is achieved by pre-contracting the plantar flexor muscles.

They are all good.

It has indeed greatly improved its startup ability.

Just ...

People are divided into different classes.

So between technology and technological changes.

Of course there will be grading.

The changes to Carter and Bolt are both very good.

They have also taken the path of scientifically optimizing their own startup.

They are all on a new scientific path.

Just ...

When they just started riding their bikes on this road.

Su Shen.

Already on this path.

Driving a supercar.

No.

Now it's time to race.

boom!

The second step.

Su Shen strongly suppressed Bolt and Carter!

The long-awaited start-up outbreak.

It's now.

The above are all laying the foundation for here.

Of course, this is just a node.

But this node.

It’s a big node.

In the plateau competition, Su Shen optimizes his horizontal force and vertical force.

It’s all for this big node.

Let your body feel this way in advance.

of course.

It is not easy to perform it on the plains.

It's ok.

It is not easy to do well on the plains.

Aerodynamics are also more difficult to control than on plateaus.

but.

There are also good times to show your abilities on the plains.

For example.

Big air gun.

Especially a game like this one.

After the wind speed reaches a limit.

Some operations that are not so easy to do in plain areas.

An operation that is not so easy to accumulate experience in.

Also can.

Show it off.

This is why Su Shen chose this game.

that's because.

He had known about this shot.

The wind speed is quite high.

boom!

third step.

After Su Mai went out, his three golden steps were over.

At this time, Carter and Walter were still in the start-up phase.

Su Shen uses a large wind gun to display scientific wind-controlling techniques.

Give yourself some of that kick-start feeling you found on the plateau.

Includes the feeling of horizontal force and vertical force.

All unfold directly on the plain.

In strong winds.

impossible.

It became possible.

Explosive output of the hip extensors!

The elastic energy stored in the tendon is released explosively!

Su Shen is fast.

At a much faster rate than before.

He lifted his body and entered the acceleration position.

It just seems like a slight change.

Su Shen paid so much price for technical research.

This is why Su Shen said again and again in his previous life that sprinting in the future will be a technical sport.

Because I want to make a breakthrough in the future.

We need more breakthroughs combining science and technology.

The possibility of breakthrough through experience and talent alone.

lower and lower.

There is less and less space.

This is the right way for Su Shen.

Su Shen entered the acceleration position faster than before.

whole person.

With the help of wind.

At an almost crazy speed.

Rushed out.

Bang bang bang.

Another four steps in a row.

Each step.

All at a speed visible to the naked eye.

promote!

promote!!

promote!!!

Each step.

They are all pulling Carter away.

Each step.

They are all pulling away from Bolt.

Even these two guys claimed that they had made great breakthroughs in this year's launch.

A startup breakthrough they are proud of.

right here.

all here.

at Hayward Stadium.

Being this fiery red figure.

It tore in half easily.

Su Shen easily rushed out from between the two of them.

this speed.

It's almost reached an unimaginable level.

Even Powell who was watching the game.

There was almost a TV in front of me.

He stood up immediately.

Powell started this year.

In fact, some breakthroughs have been achieved.

He himself is also quite proud and proud.

But now?

Under this fiery red figure.

It has become so ordinary.

It seemed as if everything had become dull.

horrible……

This shot started.

want……

Amazing.

ps: Added more content, and it’s a long chapter, hehe.

Hey guys, I'm taking a break.

Let’s continue the conversation tomorrow…