The scene of Brown being killed by Chen Juan's chest.

It's really classic and funny.

And that's for Brown himself.

No less than secondary damage.

It was depressing enough to lose the game and be killed.

As a result, I will see it on the Internet when I look back.

People joked that they lost because their breasts were not big enough.

Tell me.

This damn track and field rules.

Why just look at the torso?

Then my breasts can only develop so big, I blame myself.

Do you think Brown doesn't want to grow bigger?

Don't have this ability, do you know?

And girls compare this.

It's somewhat disgraceful.

The key is to lose to an Oriental.

I don’t know if Brown won the championship in 200 meters or if there are other reasons...

It's really the same as the original historical line.

It was announced that the game was abandoned before the game.

This made Chen Juan, who was warming up, confused.

Not sisters.

Why didn't you run away?

I just saw that you have no problem yet?

Chen Juan saw Brown raise his hand to withdraw from the competition, walked over and wanted to care, and asked Brown if he had suffered a pain in his chest?

But at this time.

"Breast", the word.

It's like a sensitive forbidden word.

I felt a little shocked when I heard about Brown.

He left with a dark face.

He didn't even lose a word.

Of course she was already dark enough.

Chen Juan:???

What's the situation?

Why does it seem like I have offended her if I care about it?

well.

These European and American sisters.

It's really difficult to deal with.

Brown quit the game, that's just a small episode, and the game won't stop because of someone.

After the referee announced that Brown had withdrawn from the game.

The rest were ready on the runway.

A battle between 8 people.

Get ready to start again.

set.

Bang----------

Jamaica's Schilloni Calvert Powell's instantaneous explosion was amazing, with a rear pedal angle of about 45 degrees, which could efficiently convert strength into an initial speed forward. He pushed his hands off the ground with his hands and lowered his head and leaned forward angle moderately.

This chapter is not finished yet, please click on the next page to continue reading the exciting content later! Her teammate Arlene Bailey took a safe and sound approach of moderate force when starting. After pushing his hands off the ground, his body leans forward angle and enters the acceleration stage smoothly.

American player Mikel Barber responded with a quick response when starting, with only 0.135 seconds. Then he pushed his feet straight and his hands off the ground quickly, and his body leaned forward in time.

Get a faster initial speed from the beginning.

She wanted to build enough advantages from the beginning.

Give yourself a buffer space.

pity……

There is a Chen Juan here.

Chen Juan, who has mastered the bent arm start.

Unless it's Fraser here.

otherwise.

None of these people are enemies of one unity.

This year's winter training, there was enough time. She started to snag her arms and started to snatch it again.

She really found a lot of feelings...

The structural characteristics of the body, including women, determine that their center of gravity is relatively low and closer to the central axis of the body.

Focusing on the point, the entire team began to upgrade their technology.

From an anatomical perspective, compared with men, the pelvis is relatively wide, and the skeletal structure of the lower limbs also has differences in morphology and proportion, which makes the center of gravity of the female body relatively lower and closer to the central axis of the body when the female is naturally standing.

This center of gravity distribution is determined by the physiological structure of women. During exercise, especially in the starting stage of short running, it will have an important impact on the stability of the body and the transmission of strength.

This shows that compared with men, women's characteristics need to be modified.

Then, based on this basis, according to the principle of center of gravity stability in mechanics, the lower the center of gravity, the higher the stability of the object.

Then at the start moment, the lower center of gravity of a woman can provide a greater stable torque.

This makes it less likely that the body will be instable such as excessive forward leaning or rolling when it is subjected to strong rear pedal force and forward impulse at the start.

This can lay a solid foundation for this to follow-up acceleration process and reduce energy loss and velocity losses caused by unstable center of gravity.

Based on these scientific points, you can get the fine adjustment and changes of technology.

Compared with the previous bent arm start, Chen Juan has made adjustments before starting, such as before the bent arm starts, her arms bent and her elbows are closer to both sides of her body than last season!

This posture reduces the swing radius of the arm, so that it can swing faster at the start, and the direction and force of the swing are easier to control.

It is not easy to do it, first of all, high-speed camera analysis is required.

This is also the primary habit of modern track and field.

Like the previous empiricism, it will only become more and more backward.

In other words, during Chen Juan's training and competition, he used a high-speed camera to shoot the starting process from multiple angles, including front, side, and top-down.

The frame rate is set to 1000fps to accurately capture the details of the starting posture and the dynamic process of arm swing.

In conjunction with electromyography signal monitoring - that is, using a surface electromyography instrument, attach electrodes to Chen Juan's anterior, middle, posterior, chest and arms, such as biceps, triceps and other related muscle parts, collecting electromyography signals during the start process, and the sampling frequency is 2000Hz to analyze the activation degree and force characteristics of the muscles.

Then, a force plate launched by Sushen Laboratory was installed below the starting device to measure the force, direction and action time of Chen Juan's feet when she started. The sampling frequency of the force plate was 1000Hz, thereby evaluating the force effect of the lower limbs at the start and its synergy with the upper limb movements.

According to high-speed camera data analysis, this is because the elbows are closer to both sides of the body, which significantly reduces the moment of inertia of the arm.

Then through calculations, we can know... the moment of inertia of the arm is reduced by about 25% compared to last season!

Based on the simplified human arm model calculation, assuming that the arm is a uniform thin rod and the rotational moment of inertia formula, the reduction of the rotational moment of inertia allows the arm to obtain a larger angular acceleration and thus achieve a faster swing speed.

In conjunction with electromyography signal analysis, the average electromyography amplitude of the deltoid anterior bundle of Chen Juan when she started to adjust this way reached 4.8mV, an increase of 14.29% compared with 4.2mV last season; the average electromyography amplitude of the pectoralis major muscle increased from 3.5mV to 4.1mV, an increase of 17.14%.

This shows that the adjustment of the elbow allows the relevant muscles to be activated and synergistically effective at starting.

Due to the reduced swing radius of the arm, the stroke of muscle contraction is relatively shortened. The muscles can achieve the maximum contraction force faster within the same time, thereby improving the muscle's force efficiency.

At the same time, the direction of muscle force exertion and the direction of arm swing are better consistent, reducing the decomposition and loss of strength, allowing more muscle strength to be directly used to push the body forward.

The force plate test data shows that Chen Juan's average level component force when she kicked the ground with her feet increased by 8.33%; the average acceleration in the first 10 meters after the start increased by 8.57%.

This proves that the increase in arm swing speed and strength forms a more effective synergy with the lower limb pushing action.

The rapid and powerful swing of the upper limbs can generate a forward and upward pulling force, which cooperates with the forward and downward thrust generated by the lower limbs pushing the ground through the body's musculoskeletal conduction system.

This makes the direction of the combined force the body is subjected to when starting is closer to the horizontal, thereby further improving the acceleration performance of the starting.
To be continued...