The Su God of the Reopening of the Sports Arena

Chapter 2452 What's Lost, It's Time for Me to Take It Back
After Bolt completed the initial 10-meter seven-step phase.

The body officially enters the 10-30 meter acceleration zone.

This range is a crucial transition from "starting and accelerating" to "high-speed cruising during the journey," and it is also the "golden period" for speed increases.

At this point, his torso had largely broken free from the large forward lean at the start and was gradually approaching an upright position. However, the bent-arm technique was not weakened by the posture adjustment. Instead, through the optimization of muscle coordination and the strengthening of energy transfer pathways, the technical advantage was further amplified, propelling the speed from 9.0 m/s to the peak range of over 11.0 m/s.

In this process, "dynamic balance" and "efficient exertion" become the core logic, with the contraction of each muscle and the extension of each joint under the precise control of biomechanics.

This achieves both "maximum force output" and "minimum energy loss".

Bolt...

That was fast this time.

Su established an advantage in the startup process.

Not much.

Su Shen naturally sensed it as well.

However, his previous advantage remains solid and he won't let anyone surpass it.

Accelerate the battle.

In the 10-30 meter acceleration zone.

Bolt's torso angle with the ground gradually increased from 80°-85° to about 90°.

Complete the posture transition from "forward tilt assistance" to "upright drag reduction".

This adjustment does not happen suddenly, but is achieved through "progressive tension control" of the core muscle groups.

Using the erector spinae muscles as the core muscle group for trunk stability, the activation level slowly decreases from 40% at the end of the activation phase to 30%.

The muscle fiber contraction pattern changes from "mainly isometric contraction" to "alternating between isotonic and isometric contraction", which avoids the center of gravity fluctuation caused by the sudden uprighting of the trunk when the acceleration switch is initiated.

It also counteracts the impact of the reaction force generated by the lower limbs pushing off the ground during running through slight "dynamic fine-tuning".

At this time, Bolt's rectus abdominis and external oblique muscles maintain a 25%-30% activation level. The former prevents excessive extension of the lumbar spine through concentric contraction, while the latter maintains the body's balance in the coronal plane through unilateral alternating contraction, in conjunction with the lower limb's pushing and swinging movements.

Avoid swaying from side to side due to increased speed.

This enhances Bolt's already terrifying acceleration ability.

It implies a further promotion.

It is worth noting that even when his torso is nearly upright, Bolt's head remains in a straight line with his torso.

The lower jaw is slightly retracted.

Look straight ahead.

This seemingly minor detail reduces energy loss from head shaking through "low activation control of neck muscles".

The activation level of the sternocleidomastoid and upper trapezius muscles is always controlled at 15%-20%, which only maintains the basic stability of the head and avoids uneven stress on the cervical spine caused by raising or lowering the head, thereby affecting the energy transfer efficiency of the trunk.

This integrated "trunk-head" stabilization mode allows the forward force generated by the lower limbs pushing off the ground to travel directly along the spine to the trunk, and then be transmitted to the whole body through the upper limbs swinging. The energy transfer loss rate is further reduced from 6%-8% in the initiation phase to 4%-5%.

It became an "invisible booster" for Bolt's continuous acceleration.

Accelerate.

Bang bang bang bang bang.

Bolt's lower limb push-off pattern has upgraded from "mainly pushing off backward" in the starting phase to a "full push-off pattern" that coordinates "pushing forward, pushing off backward, and pulling on the ground". Although the "time window" for muscle power is still short, the "breadth" and "intensity" of power generation have been significantly improved, forming a power generation system of "synchronous burst of multiple muscle groups and coordinated extension of multiple joints".

well.

Watch Bolt's performance.

Mills finally got a little excited.

This.

It's what he wants in his mind but can't realize.

I never expected this.

Successful.

Bolt's hip joint began its functional progression from "rapid extension" to "powerful drive".

Using the hip joint as the "core hub" for lower limb power generation, the function in this range shifts from "rapid hip extension" in the initiation phase to "powerful drive".

Although the activation level of the gluteus maximus decreased slightly from 70% at the end of the activation phase to 65%, the "peak explosive force" of the contraction increased.

This is because the muscle shifts from "rapid contraction" to "maximum force contraction," increasing the number of muscle fibers recruited from 75% to 85%, especially with a further increase in the activation rate of type IIb fibers in fast-twitch muscle fibers.

This increases the hip extension torque from 120 N·m during the initial stage to 140 N·m.

At the same time, the activation of his gluteus medius and gluteus minimus increased from 20% to 30%. Through concentric contraction, he controlled the abduction and internal rotation of the hip joint, avoiding hip joint displacement caused by excessive force of pushing off the ground, ensuring that the force line of the lower limb is always transmitted in the forward direction, and reducing the loss of force efficiency.

15 m.

As the hip joint extends, the activation pattern of the iliopsoas muscle also changes.

During the initial phase, the iliopsoas muscle primarily controls the flexion speed of the hip joint through eccentric contraction. In the acceleration zone of 10-30 meters, it switches to alternating concentric and eccentric contractions. After the hip joint completes extension, it quickly pulls the thigh forward through concentric contraction, shortening the "swing cycle" of the lower limb and buying time for the next push-off. This seamless transition between hip extension and leg swing increases the "working efficiency" of the hip joint by 20%.

This will be key to Bolt's steady improvement in stride frequency.

20 m.

Knee joint adjustment.

In contrast to Bolt's initial acceleration phase, where the knee joint primarily serves as an "auxiliary extension" joint, it gradually transitions to a core role of "active power generation" in the 10-30 meter acceleration zone.

The activation rate of the quadriceps increased significantly from 60% at the end of the activation phase to 75%, with the rectus femoris, a biarticular muscle that spans the hip and knee joints, showing the highest activation rate.

By generating a powerful knee extension torque through concentric contraction, the knee joint can be quickly extended from a bent state to near straight, around 175°, providing the body with forward "propulsion".

The activation rate of the biceps femoris and semitendinosus muscles increased from 30% to 40%. While the knee joint was extending, the extension speed was controlled by eccentric contraction to avoid damage to the knee joint caused by overextension, forming a synergistic protection mechanism of "knee extension-knee protection".

More importantly, Bolt further reduced the "torque coordination time difference" between his knee and hip joints.

For example, during the start-up phase, the peak torque time difference between the two is 0.005 seconds, while in this range, the time difference is reduced to 0.003 seconds.

this means……

Bolt's hip extension torque now reaches its peak almost simultaneously with his knee extension torque.

This creates a "superposition effect of forces".

This synergistic effect increases the "total propulsion" of the lower limbs by 25%, and the direction of propulsion is closer to the direction of forward movement.

The angle with the ground decreased from 18° in the initial stage to 15°.

The horizontal force component increased from 60% to 70%, directly contributing to Bolt's rapid acceleration breakthrough.

25 m.

Ankle joint movement within the three joints.

In Bolt's case, the function of his ankle joint in the 10-30 meter acceleration zone has expanded from "transmitting the reaction force of pushing off the ground" in the starting phase to "actively pulling on the ground to accelerate".

This is what the labs in the US want.

Hopefully, this place will become a "terminal booster" for Bolt's lower limb power.

When Bolt ran to this point, the activation level of his calf muscles was maintained at around 80%, and the contraction mode changed from "rapid concentric contraction" to a compound mode of "eccentric contraction-concentric contraction-isometric contraction".

When the foot contacts the ground, the calf muscles first buffer the ground reaction force through eccentric contraction, and the muscle fibers slowly lengthen to absorb the impact energy.

It then quickly transitions to concentric contraction, causing the ankle joint to rapidly extend from a flexed position to near straightness.

It generates a powerful reaction force from pushing off the ground.

Just as the ball of the foot is about to leave the ground.

The muscle then transitioned to a brief isometric contraction.

Ensure that the reaction force from pushing off the ground is fully transferred to the body to avoid wasting energy.

At the same time, the activation rate of the tibialis anterior muscle increased from 30% in the initiation phase to 40%.

Before Bolt's foot lands, he lifts his toes by concentric contraction, so that the ball of his foot contacts the ground first, reducing the impact and energy loss from landing on his heel.

Meanwhile, the small muscle groups in the arch of the foot, such as the adductor hallucis and flexor digitorum brevis, are also moderately activated, maintaining the elasticity of the arch by contracting and further amplifying the "ground-gripping effect" of the forefoot.

This "forefoot landing first + arch cushioning" pattern increases Bolt's ankle push-off efficiency by 15%, and the horizontal support reaction force is always maintained at 1.6-1.7 times his body weight, providing stable "end-of-line power" for the continuous increase in speed.

These are the details.

This has never happened before.

It's fair to say that Bolt has never been this meticulous before.

That's why I always feel there's a lot of room for improvement in his running form.

Green always felt that his technique was a bit rough.

This is mainly due to Jamaica's technological productivity.

It's not feasible to make it that detailed.

So you can see that Jamaican athletes, overall, have a more rugged running style.

American athletes, on the other hand, use a more scientific and meticulous running style.

Both of them actually follow the North American running style.

But there are also fundamental differences. The biggest difference lies here.

It's not that Jamaica wanted to be this rugged.

Rather, it's their existing conditions and technological level.

This is the only option we can support.

The more sophisticated ones have already exceeded the limits of domestic technology.

That kind of progress is beyond what one person's brain can handle.

Even if you are one of the greatest coaches of all time, Mills.

the same alsp.

Without the aid of these advanced instruments and technologies.

You can no longer help Bolt go any further.

30 m.

In the 10-30 meter acceleration zone, Bolt's upper limb swing did not change with the increase in speed. Instead, through "precise control of the arm swing trajectory" and "dynamic adjustment of muscle activation", he achieved a functional upgrade from "assisted stability" to "active boost".

At this moment, the flexion angle of his elbow joint was stable at 100°-105°.

This "small-angle bend" posture can still effectively shorten the rotational inertia of the upper limbs, allowing his arm swing speed to maintain a high degree of coordination with his stride frequency.

This is to...

The "aerodynamic effect" and "torso balance effect" generated by the swinging arms provide additional propulsion to the body.

To break it down further, it's the front swing arm phase.

Bolt maintained an activation level of 75%-80% in his anterior deltoid and pectoralis major muscles, but the "point of force" for muscle contraction became more precise.

The anterior deltoid is mainly responsible for the forward swing of the upper arm, while the pectoralis major pulls the upper arm inward by contracting, keeping the distance between the arm swing trajectory and the torso at 5-8cm, thus avoiding increased air resistance due to excessive arm swing amplitude.

Bang bang bang bang bang.

The activation level of the biceps brachii is dynamically adjusted according to the arm swing position. In the initial stage of the arm swing, the activation level increases to 35% when the upper arm starts from back to front, and the arm swing speed is accelerated through concentric contraction.

During the middle of the arm swing, when the upper arm is close to the chest, the activation level drops to 25%, maintaining the flexion angle of the elbow joint.

At the end of the arm swing, when the upper arm is about to reach the peak of the forward swing, the activation level increases again to 30%, which reserves power for the start of the backward swing.

This "dynamic adjustment" activation mode increases the proportion of "effective propulsion force" of the front swing arm from 98% in the start-up phase to 99%, with almost no excess force loss.

In addition, wrist and hand posture control is more precise.

The activation levels of the radial and ulnar flexor carpi radialis muscles are maintained at around 20%, ensuring that Bolt's wrist remains in a neutral position and his palm is naturally relaxed, avoiding the dispersion of power caused by wrist flexion or tension.

This relaxed "wrist-hand" state not only reduces energy consumption in the upper limbs, but also optimizes the aerodynamics of the arm swing.

To reduce the impact of air resistance on speed, biomechanical simulation data shows that this relaxed posture can reduce air resistance in the upper limbs by 10%-12%.

That's how we won the battle.

Is this still Usain Bolt?
Is this still the Bolt we remember?

If Bolt in Moscow is Bolt giving it his all.

Now, let's talk about Bolt.

That's Usain Bolt giving it his all.

In addition, a new term has been added.

Usain Bolt giving his all with the support of advanced scientific technology.

In addition, during the backswing phase, the activation of the posterior deltoid and latissimus dorsi muscles increases to 70%-75%, further enhancing their synergy.

The posterior deltoid is responsible for the backward swing of the upper arm, while the latissimus dorsi pulls the upper arm backward and downward by contraction, so that the amplitude of the backward swing is consistent with that of the forward swing, forming a "symmetrical" arm swing rhythm.

The activation rate of the triceps increases from 25% to 30% during the initial swing phase. In the later stages of the arm swing, just as the upper arm is about to reach the peak of the backswing, the concentric contraction accelerates the backswing speed of the upper arm, providing "rebound force" for the next forward swing. This "backswing acceleration - forward swing leverage" pattern...

Bolt really showed his true colors here.

He intends to intercept Su Shen here.

The most obvious feeling after he ran like that was...

The gap in the acceleration zone has been gradually closed by Su Shen.

suddenly.

Bolt is catching up to him again.

It feels a bit like we're back to where we were before London.

The entire acceleration phase.

From the hip joint, the function progresses from "rapid extension" to "powerful drive".

The role of the knee joint shifts from "assisted extension" to "active force generation".

The function of the ankle joint has expanded from "push-off reaction force" to "pushing-off acceleration".

The three-joint technique was perfectly integrated into the bent-arm start.

In other words, this is not a simple startup.

It is not a sample.

It is a mature technique that has been completely tailored to his physiological characteristics and features.

It was created by Su Shen for Zhao Haohuan.

There's not much difference anymore.

Combined with the optimization of upper limb arm swing efficiency, the function has been upgraded from "high-frequency coordination" to "high-efficiency boost".

The forward arm swing improves power efficiency by moving from "close to the torso" to "precise force application".

The rear swing arm has been enhanced in function, moving from "symmetrical swing" to "coordinated force exertion".

Usain Bolt.

They delivered an amazing performance here.

Not only did he start behind, but Su Shen's performance also drastically decreased.

It's already very difficult to catch up in those few dozen meters during the acceleration zone.

There was a slight sense of suppression again.

The average viewer might not be able to see many clues.

But as a professional.

Mills was excited.

Francis was surprised.

The lab in the US that collaborated with Bolt met the requirements.

Even Su Shen's team.

Professionals from Ersha Island.

All of this was achieved through Boltl's performance.

I was deeply shocked.

This completely exceeded their pre-match expectations.

This is no longer a simple bent-arm start.

This is already a completely customized technology.

and.

It's already 100% complete.

It is not a semi-finished product.

It is a mature product.

This is where Bolt is.

Although he is still behind Su Shen.

However, this gap remains significant.

It was completely under Bolt's control.

It was a gap that was completely acceptable to him.

Sue.

Just wait and see.

What we've lost over the past few years.

I want them all back.

(End of this chapter)