On both sides of the track, high-magnification cameras have been set up, ready to record all the running processes of the competitors on the field.

In the process of running in a group of fast groups, it is difficult to see many details of the running problem through the naked eye, even the top coach, there are some subtle places that cannot be seen at a glance.

At this time, what is needed is to slow motion frame by frame, and constantly analyze the movement state of the runners during the run, so as to find the shortcomings and improve them.

After running seven or eight times, Ye Qin did not continue to run, but went to the sidelines to watch the video of his own running.

This is one of the key points of his current learning, through video recording and then combined with his own running experience, little by little details to improve.

The IMG Academy is also very welcoming to have top athletes like Yechin train here, on the one hand, Yechin himself is a star client of IMG and has a great influence all over the world. Just as IMG Academy has often brought out a tennis actress, Sharapova, star athletes can be a significant role in elevating a training institution.

On the other hand, the training materials of top sprinters are also very good accumulation for coaches.

"You go from accelerating to running on the way, I think it's a little slower, and the head up and arm swing can be a little smoother."

Yuan Guohua sat beside Ye Qin and pointed to the computer screen. In the video of the route that Ye Qin just finished running, in slow motion, you can see the whole process of Ye Qin from starting to accelerating, to running on the way.

"I don't think I'm strong enough, and I feel like I can go a little faster."

After Ye Qin looked at it for a while, he grabbed his hair, thought for a while, and asked Yuan Guohua tentatively.

"Probably." Yuan Guohua nodded, he did not interfere with the training plan of the coaching staff here during the IMG Academy, but he also analyzed the recorded video.

When it comes to athletes of Ye Qin's level, many times they no longer have obvious flaws and weaknesses, and they can point out the problems in just a few words, but they need to be constantly tried and analyzed.

"Your current physical condition can still add some muscles a little more to improve the strength of your muscles. However, this may affect your performance in the 400m to some extent. ”

At the World Championships in Osaka, Ye Qin ran 44 seconds for the first time, and he basically never ran this result again in training, even if it was a test in training, the best time in his hand was about 44.10 seconds.

On the one hand, the training is not as good as the competition, and the body may not be fully excited, and the other is that after Ye Qin focused on explosiveness and short-distance running in training, he felt vaguely affected by himself.

"Hey, Ye, and Yuan, it's great that you're here! I have news for you. ”

While Ye Qin and Yuan Guohua were discussing their running skills, Haydn Combe, the coach of IMG Academy who led the training of the Chinese track and field team, was holding an A4 paper and looked excited to find the two.

"What's wrong, Haydn?" Ye Qin asked with some doubts.

"We've unlocked the secrets of your body." Haydn Combe handed the A4 paper in his hand to the two of them, "This is an analysis report for your muscles, you can take a look." ”

Ye Qin took the A4 paper handed over by the other party and looked up and down carefully.

This is a muscle scan that he has done since he came to IMG Academy, and the body secrets of a top athlete like him are the dreams of almost every training and research institute.

There was a large list of data on the report sheet, and Ye Qin took a general look at it, although some professional terms could be understood, but he was not a medical professional, and he still couldn't see it very thoroughly.

Yuan Guohua next to him frowned, as a top coach, he relied more on experience teaching, and he also did not particularly understand this kind of scanning that unveiled the composition of human muscles in an all-round way.

"I'll explain it to you." Haydn Combe probably expected that the two might have a lot of questions about this, and to be honest, there are some details in this that the average coach definitely doesn't know much.

Stretching out his hand and scratching a column on the A4 paper, he said, "I think you all probably understand that it is mainly the red and white muscles that determine our human body's long-distance running or sprinting. ”

Ye Qin nodded, in the past two years, he has done some research in cooperation with Shuimu University and the Training Bureau, and he still knows about this.

Of course, it is not particularly in-depth, after all, the domestic physical education, especially exercise physiology, is still in a relatively primitive stage.

The muscles needed for long-distance running and sprinting are not the same, and the main muscles that determine the ability of long-distance running and sprinting are red and white muscles, and red muscles are needed for long-distance running, and white muscles are needed for sprinting.

"These are just two big classifications, according to the activity function of the skeletal muscles and according to the shape of the skeletal muscles, there can be a more detailed division, you see the ...... here"

Haydn - The subject was explained in detail while comparing the contents on the A4 paper.

Ye Qin and Yuan Guohua listened carefully to each other's explanations, raised some questions from time to time, and finally roughly understood what Haydn Combe said.

To put it simply, white muscle fibers belong to motor motor nerve units, which are responsible for voluntary movements, and the cross-section is thick, so the muscle groups are easy to develop and thick. White muscle fibers contain more myofibrils and less myoglobin and cytochrome, and the contraction speed is fast and forceful during exercise, and the explosive power is strong, but the endurance is poor. It is the main type of muscle that sprinters need.

Red muscle fibers are tensile-motor neurons that are responsible for maintaining tension postures, also known as slow motor units. Red muscle fibers contain more myoglobin and cytochrome, less myofibrils, and the contraction of red muscle fibers is slower during exercise, and the explosive power is not strong, but it can last for a long time. This type of muscle is mainly needed by long-distance runners.

But this is only the difference between the two categories, in detail, according to the activity function of the skeletal muscle, the type of bone muscle fibers should be divided into slow contraction muscle and fast contraction muscle, of which slow contraction muscle belongs to red muscle, and fast contraction muscle includes red muscle and white muscle.

For muscles with motor function, they can be divided into three categories: slow-contracted red muscles, fast-contracted red muscles, and rapidly contracted white muscles.

Slow-shrinking red muscle has a high aerobic capacity and fatigue resistance, but it is a low-intensity, long-term muscle type with poor glycolytic (anaerobic) capacity, slow contraction, and low muscle strength per motor unit.

Rapidly shrinking white muscles have the highest glycolytic (anaerobic) capacity and muscle strength per unit of exercise, but they are poor in aerobic capacity, contraction speed, and fatigue resistance, and belong to the muscle type of high-intensity, short-term exercise.

Fast-shrinking red muscles, on the other hand, have the best of both muscle types, somewhere in between.

In general, the proportion of the three types of bone muscles accounts for about 50%, 25% and 25% respectively, that is, the proportion of slow-shrinking red muscles is the highest.

Some long-distance runners may have 90% slow-twitch fibers as well as 10% fast-twitch fibers. Some runners may be 70% slow twitch and 30% fast twitch. Conversely, a runner belonging to the sprint sport may have 80% fast-twitch fibers and 20% slow-twitch fibers.

"Ye, you are a world-class sprinter, you probably know that part of your body has more muscles, right?" After Haydn Combe finished some knowledge of the red and white muscles, he opened his mouth and asked Yechin.

"There are more fast-twitch fibers." Ye Qin replied.

"That's right. Your fast-twitch fiber content is among the best in the world, while your slow-twitch twitch fiber content is low. Haydn Combe nodded, then asked, "Have you ever thought about how you can sprint when you're running 200 meters or 400 meters, when everyone else is still sprinting, in the final stage?" You'll be able to sustain your speed better than most sprinters, and you'll probably run 100 meters better than your muscle fibers. ”

As he spoke, without waiting for Ye Qin to answer, he continued, "That's because you have more fast-shrinking red muscles in your fast-twitch fibers than many sprinters. ”

By the time he said this, Haydn Combe was completely excited, "That's the secret to being able to do the men's 100m, 200m and 400m at the same time. Not only will you be able to have strength and speed, but you will also be able to hold him up. ”

While explaining to Ye Qin and Yuan Guohua, Haydn Comm explained the rapid contraction red muscle between the fast-shrinking white muscle and the slow-shrinking red muscle.

Muscle fibers begin to differ depending on each person's genetics and the way they are born with different movements. Some people are born with fast muscles and white muscles, which is a muscle stick suitable for lifting dumbbells, and some people have more slow muscles, which is superior endurance athletes.

But these differences can be fine-tuned and changed, that is, whether a person's muscle type has more white or red muscles, in addition to the natural qualities, can also be changed through training.

To put it simply, if a person conducts long-distance running training for a long time, his red muscles will gradually increase, and when he sprints training, his white muscles will increase.

And this process of change mainly comes from the rapid contraction of the red muscle in the rapid contraction muscle, which can be transformed into the rapid contraction white muscle or the slow contraction of the red muscle.

After listening to Haydn Comb's explanation, Yechin fully understood the characteristics of his own muscle groups. He has more fast-twitch fibers than the average sprinter, but the extra part is not pure fast-shrinking white muscles, but fast-shrinking red muscles.

This allows him to have a strong speed ability, but also the aerobic ability and resistance to carry fatigue brought by the rapid contraction of red muscles.

Therefore, he is faster than the special 400m athletes, but compared with the special 100m athletes, he has a strong ability to maintain speed.

"This is good, this is good!" Yuan Guohua listened to Haydn Comb's explanation next to him, nodded again and again, and a happy smile appeared on his face.

This analysis is the most useful gain he has found since coming to IMG Academy.

Through this analysis of body muscles, Ye Qin's focus on future training became clear.

Just as he only focuses on the 100 meters and 200 meters, his fast-shrinking red muscles can gradually transition towards the fast-shrinking white muscles, further improving his speed ability.

If you want to concentrate on the 400 meters, if you have a strong performance in the 400 meters, you can do proper long-distance training to make his fast red muscles overshoot the slow red muscles and improve his endurance level.