"Aye, the starting moment of the 100-meter track contains the key technology that determines victory or defeat. There is a huge difference between the bent-arm start and the straight-arm start. There are complex and profound scientific principles behind this."
"From a biomechanical point of view, the cranked arm start is a highly optimized starting method. When you use the cranked arm start, the bending angle of your arms is determined based on the best mechanical model of muscle force generation. The arm bending forms
The short moment arm structure is like a set of efficient levers installed on both sides of the body. When starting, the force generated by muscle contraction can be transmitted to the body with higher efficiency through this short lever, driving the body forward."
"From the analysis of muscle kinematics, in this posture, the contraction direction of the shoulder deltoid, biceps and triceps muscles that are mainly involved in arm swinging is more consistent with the arm swinging direction, reducing the strength
Decomposition during the conduction process. At the same time, due to the short moment arm, the muscles only need a smaller contraction amplitude to produce a larger angular velocity, thereby making the arm swing faster. This series of muscles work together to make the arm swing
The force can explode in an instant, providing strong initial acceleration for starting."
"Looking at the transfer of the body's center of gravity, the cranked-arm start allows the center of gravity to move forward more quickly and stably. During the starting process, the movement trajectory of the body's center of gravity is one of the key factors that determine the efficiency of speed improvement. The cranked-arm start shortens the swing
The arm radius enables the body to gain acceleration along a vector direction closer to the horizontal direction at the moment of starting, which is like paving a high-speed channel for the movement of the center of gravity. This way of moving the center of gravity not only reduces unnecessary vertical movement
Energy loss, and the body can enter a high-speed running posture more quickly, just like a rocket quickly adjusts its posture in the early stages of launch to obtain the best flight trajectory."
"In stark contrast, the straight-arm start. When the straight-arm start is made, the arm is straightened, resulting in the moment arm being too long. According to the principle of torque, under the action of the same muscle force, the longer the moment arm, the greater the torque generated.
But this requires more energy to overcome the resistance torque, and the force transmission efficiency will be significantly reduced. In this case, the shoulder muscles need to spend more energy to initiate the arm swing, and during the arm swing process
, the force will be dispersed on the long arms and cannot be concentrated and exploded like a curved arm. From the perspective of movement trajectory, when starting with straight arms, the arm swinging action will cause the body's center of gravity to fluctuate greatly in the vertical direction. This
This is because the action of the straight-arm swing arm will produce an upward component, causing unnecessary displacement of the center of gravity in the up and down direction, increasing energy loss. This waste of energy is like frequent braking and braking of a car while driving.
It's the same as starting, which seriously affects the improvement of starting speed."
"So the movement pattern of cranked-arm starting is more conducive to the rapid coordination of the nervous system. Since the rhythm of muscle contraction and relaxation in the cranked-arm movement is relatively simple and efficient, the nervous system can more accurately control the sequence and intensity of muscle force exertion. And directly
Due to the complex movements of the arm start and the indirect force transmission, the nervous system needs more time and energy to adjust when controlling the muscles to work together, which will lead to obvious disadvantages at the start moment when every second counts."
"In short, there are significant differences between bent-arm starts and straight-arm starts in multiple scientific dimensions such as biomechanics, muscle kinematics, body weight transfer, and neuromuscular control. These differences determine the key link of the 100-meter start.
The crank-arm start has unparalleled advantages and is an inevitable choice when pursuing extreme speed."
"Of course...this prerequisite is..."
"You need to be able to really master that starting technique."
"It is very difficult to master this technique thoroughly. This is why among many black players, not many people have mastered this technique. Its technical difficulties are quite complicated."
"So if you can't master this technology, it's better not to use it until you are proficient."
This was what Su Shen had said before when he explained the concept of crank start to him. In fact, at that time, Su Shen was already looking forward to when he could master this technique.
With this younger body now.
A more scientific body.
Build a better body.
A healthier body.
Wanted to see if he could do it.
Unexpectedly, I am not even 20 years old yet.
He has already transformed this technology into actual combat. This was more than 10 years earlier than in his previous life.
very good.
let me see.
Have you really mastered it or are you pretending to have mastered it?
Aye.
Su Shen looked forward.
Stare at the starting position.
His eyes are like torches.
Bang--------
Xie Zhengye started.
Located on the front of the upper arm, it is the key muscle for starting with a bent arm.
When starting to run, the biceps brachii contracts strongly, pulling the forearm to bend inward, causing the arm to complete the arm flexion action, providing the traction force of the arm to start the body forward.
The moment Xie Zhengye started running, through the rapid contraction of his biceps, his arms quickly entered a flexed state, preparing for subsequent acceleration movements.
Secondly, it is located on the deep surface of the biceps. It works together with the biceps to strengthen the strength of elbow flexion. During the starting process, it assists the biceps to complete the arm flexion action, increasing the strength and stability of arm bending.
, ensuring that the arms can bend quickly and powerfully to provide better support for the body's start.
Then go to the brachioradialis, which is located on the outside of the forearm and is also one of the main flexors of the forearm. Its contraction helps the forearm to bend better, and when starting, it cooperates with the biceps brachii and brachialis muscles to control the bending angle of the forearm.
and speed, making arm movements more coordinated and efficient.
Then go to the anterior deltoid muscle, which connects the shoulder and upper arm. When starting with bent arms, it will contract moderately to help stabilize the shoulder joint and assist in lifting the arm forward and upward. This not only helps the arm enter the bent state faster
, it can also increase the amplitude and strength of the arm swing, providing additional power for the acceleration of the body.
This chapter is not over, please click the next page to continue reading! Let’s go to the supraspinatus muscle. This muscle is located above the shoulder and is mainly responsible for the abduction and lifting of the shoulder joint. When starting with bent arms, the contraction of the supraspinatus muscle can help
Maintain the stability of the shoulder joint and ensure that when the arm is raised and bent, the shoulder joint will not be unstable such as shaking or dislocation, so that the arm can move smoothly.
Coupled with other muscles of the forearm, such as pronator teres, wrist flexors, digital flexors, etc., although they play a relatively small role in the bent-arm start, they will also participate in the movement. The contraction of these muscles can help adjust
The hand posture allows the palm of the hand to better hold the starting block, increases the friction between the hand and the starting block, and provides better support for the forward start of the body.
Finally come together to activate the core.
Including abdominal, back and pelvic floor muscles.
When starting with bent arms, the core muscles will contract to maintain the stability of the body, effectively transmitting the power of the legs to the upper body, so that the power of the upper and lower bodies can work better together.
And because the contraction of the abdominal muscles can help maintain the body's upright posture and prevent the body from falling forward when starting, the contraction of the back muscles can help keep the body straight and increase the body's explosive power.
Then.
A full crank start.
It’s done.
Get off the starting line.
Compared with straight-arm starting, the latissimus dorsi muscle is connected to the upper arm from the lower back. When starting, its contraction can pull the arm backward and downward, while the contraction of the pectoralis major muscle can pull the arm forward and downward. These two muscles work together to make
The arm swings back and forth in a straightened state. In this way of swinging, the force generated by muscle contraction needs to be transmitted through a longer moment arm, resulting in dispersion of force, and in order to generate sufficient swing torque, the muscle needs to contract at a larger scale
, consume more energy.
Now……
Starting with a bent arm mainly relies on the contraction of flexor muscles such as the biceps brachii, brachialis and brachioradialis to complete the arm curling action. When these muscles contract, the direction of the force acts more concentratedly on the bending of the arm, allowing the arm to move quickly and powerfully
The ground swings.
Moreover, due to the bending of the arm, the muscle contraction distance is relatively short to generate sufficient angular velocity to drive the body forward. The anterior deltoid and supraspinatus muscles of the shoulder mainly assist in stabilizing the shoulder joint and moderately pulling upward and forward.
The role of the arms makes the transmission of power more direct and efficient.
Take a step forward.
Xie Zhengye could feel that the contraction of the rectus abdominis, external oblique muscles and erector spinae muscles in his abdomen can maintain the normal physiological curvature of the spine, effectively transmit the force generated by the legs upward, and at the same time ensure that the upper body is in the arms.
The stability during rapid swing enables the body to accelerate in a relatively stable direction. Compared with straight-arm starting, the contraction of the rectus abdominis can prevent the body from leaning forward excessively and allow the body's center of gravity to shift more smoothly in the horizontal direction.
Similar to a straight-arm start, the arm swing makes it easier for the body's center of gravity to fluctuate up and down, and the core muscles need to spend more energy to control this instability.
It is now greatly reduced.
For example, when the arms swing backward, the center of gravity of the body may move backward and upward. At this time, the abdominal muscles need to contract more strongly to prevent the body from leaning back, and the back muscles must work together to ensure the overall balance of the body.
I feel much more comfortable now.
Outside spectators looked on and saw that Xie Zhengye started instantly and showed his advantage in the bent-arm start.
His arms are bent at precise angles, and his elbows are close to his sides, like powerful pistons.
When swinging the arm, power explodes rapidly from the shoulder along the muscle chain. The short-radius swing arm allows the power to be transmitted more directly and quickly drives the body's center of gravity forward.
This is completely different from the ordinary straight-arm start, which has a long moment arm, dispersed power and slow conduction, and weak starting explosive power.
Now this problem has been greatly solved.
Xie Zhengye's leg muscles exploded powerfully, kicking off the ground quickly, and his stride reached its best at the moment of starting. Every step seemed to be propelled by an explosion. The force generated by the friction between the soles and the track propelled him like an arrow.
Bang, bang, bang, bang, bang, bang, bang.
Ten meters later.
Enter the acceleration zone.
Xie Zhengye continued to accelerate, and the swinging rhythm of his curved arms accelerated, like a high-frequency drum beat.
At this time, his head remains stable and the neck muscles are as stable as steel cables to ensure the balance of the head and avoid energy loss.
The shoulder muscles rise and fall rhythmically, like undulating mountains, continuously delivering power to the arms. His spine maintains optimal physiological curvature, like a fully drawn bow, providing stable support and elastic potential energy for the body.
The kicking and stretching movements of the legs are more powerful, the hip movement is perfectly coordinated, the thighs drive the calves to swing forward quickly, the calf muscles show amazing explosive power between contraction and relaxation, the step frequency is accelerated, and each step is precisely at the power explosion point.
The force generated by the arm swing and the force of the leg kicking form a combined force to push him forward. His ankles show good rigidity when kicking the ground, effectively transmitting the force to the ground while maintaining stability to avoid energy loss.
In order to cooperate with the explosion of the curved arms, Xie Zhengye's feet scraped the ground quickly and powerfully, getting the maximum reaction force every time he came into contact with the ground. As the acceleration became faster and faster, Xie Zhengye's body leaned forward slightly to reduce air resistance.
The impact on speed is like a discharged cannonball whizzing through the air.
Gradually raised his head.
Run on the way.
Xie Zhengye's speed further improved and entered a new stage.
At this time, his core muscles play a key role, acting like a stable central hub to integrate the strength of the upper and lower body.
His stride has reached a new balance at this stage, which ensures speed without excessive consumption of energy.
At this stage, his body coordination has reached its peak, and the cooperation of various joints and muscle groups is like a well-choreographed dance. The knee bending and knee extension movements of the legs are smooth and natural, and the back and front swing of the calves are just right.
To put it simply -
The action of running is enjoyable to watch.
Higher.
It looks better.
Bang!
Extremely fast explosion.
This chapter is not finished yet, please click the next page to continue reading the exciting content! Xie Zhengye entered the core area of running, and his speed continued to rise like a rocket taking off. It can be seen that his technical movements are more delicate than last year
And precision. The influence of the bent-arm start allows the body angle and swing range to be fine-tuned according to the speed to adapt to a higher rhythm.
The leg muscles still maintain excellent elasticity under high-intensity running, and each push can produce powerful explosive force.
Bang, bang, bang, bang, bang.
Bang, bang, bang, bang, bang.
Xie Zhengye began to prepare for the final sprint.
The body posture is slightly adjusted, the hip extension is increased, and the stride length is further increased.
His leg muscles have shown super endurance and explosive power after years of training. Every time he steps on the ground, it seems to leave a deep mark on the ground.
The last twenty meters.
Xie Zhengye is getting closer and closer to the finish line, but his speed has not slowed down at all. His body is like a high-speed machine, and every part is working crazily for the final sprint.
This is the benefit of 200-meter athletes running 100 meters.
His leg muscles have entered a super-intensity working state, and the impact of lactic acid accumulation on him is much less than that of ordinary 100-meter athletes.
Xie Zhengye didn’t slow down too much.
It's like the natural speed attenuation of the human body.
The impact on him is smaller.
Here he is taking big strides.
Cross the finish line straight.
others feel.
It seems.
It's like I didn't let go of much in the end.
He passed the finish line straight ahead.
"No way."
"Why didn't you seem to have much strength in the end? It was just a smooth leg. Can you run so fast?"
"Are you too excited?"
"You are still a young man after all."
Yeah?
Just when some of the older coaching staff were sighing alone, they looked at the results...
Everyone was dumbfounded.
10.1……5???
The smooth leg reached within 10.20???
And it’s not even past one and a half.
I……
Liang Jiahong was still a little happy that he had run the best smooth leg performance of his career just now.
Look at this score.
The whole person.
They were all a little numb.
Xie Zhengye himself turned around and looked at the results. Like a small motor that couldn't stop, he immediately shouted to Su Shen:
"Mr. Su, how was my run?"
It's like a child who gets good grades and wants to show off, wants candy, and wants a little red flower.