Time goes back to yesterday afternoon.

Klopp is reviewing the results of the team's physical test report that he just got in his office.

Next to him, all members of the physical fitness coaching team were there. After Klopp read a person's report, he would pass it on to the physical fitness coaches to read.

He is now staring at a person's report tracing.

"Oliver," he said.

Oliver Bartlett came over.

"Look at this." Klopp pointed the chart on the report to Bartlett. It was a chart showing the player's heart rate changes at different speeds.

"Book of Zhou Yi?" Bartlett asked.

"Um."

Bartlett picked up the report and read it very seriously.

After reading this page, I still flipped down.

After reading, he took the report and said to Klopp: "I remember when he first joined the youth team, we did a similar physical test for him... The report is still there, waiting for me to get it."

After saying that, he left Klopp's office directly, and the other colleagues looked up at Bartlett's hurried back, a little strange.

Klopp did not explain, but continued to look at the next report.

Not long after, Bartlett returned to Klopp's office with a report.

Then he turned the two reports to the same chart page and compared them, and then knocked on the report: "Well, the heart rate changes significantly. His heart rate dropped."

Heart rate is an important indicator for athletes, especially in terms of physical fitness.

There is a simple comparison method, that is, professional athletes, especially endurance athletes, have lower heart rate than ordinary people. This is because the athletes have adaptive adjustments to their body and heart after professional training.

Therefore, by checking a person's heart rate changes during exercise, it is easy to see whether he is a qualified athlete or whether he has received professional training.

This has also been verified by Zhou Yi.

When he first came to Dortmund, he had a physical examination, which was a physical examination in the team.

In fact, during that physical examination, Zhou Yi had already felt the professionalism of European football clubs.

He used to think that physical examinations were very simple tests such as height, weight, endurance, speed, etc.

But in fact, it is far more complicated than he thought.

The team doctor asked him about his medical history, and if he had undergone any surgery before, he had to answer the family history truthfully. Because Zhou Yi had not played in other clubs before, Dortmund could not check his injury history from the clubs before Zhou Yi. This aspect can only be conscious of Zhou Yi. If Zhou Yi wants to hide anything, it will be difficult for Dortmund to know.

However, except for the cold, Zhou Yi had no history of injury and had no surgery.

Zhou Yi's living habits were asked all of them, such as when to go to bed every day, when to get up, how good is the quality of sleep, is it good or bad, do you dream, don't dream much, do you have insomnia, etc., whether you drink coffee, will it have any impact on your sleep, what is the frequency of drinking coffee, daily eating habits, and taste...

Later, a cardiac examination was performed, including electrocardiogram tests, cardiac echo detection, etc.

Urine tests will also be conducted to check for proteins and ketones to avoid problems such as diabetes.

The muscle and joint examination is followed, and the physiotherapist will evaluate the range of motion of each joint and compare it with the normal value.

Muscle strength is also very important. For example, there is a certain imbalance in the muscles of both legs, which may affect the player's ability to run long distances.

Blood draw is also essential. Draw once before the physical examination and once after the physical examination.

The blood test results show the player's kidney function, vitamin intake, and changes in these indicators during exercise.

The ability of aerobic exercise and anaerobic exercise are very important indicators for football players, and naturally there will be no missing tests in this aspect. Zhou Yi was asked to try his best to test his limits in this kind of test.

Zhou Yi was wearing an oxygen mask similar to a pilot, with electrodes on his body, and ran very strongly on the treadmill, with the pace frequency and the treadmill track angle constantly changing.

This kind of running can analyze Zhou Yi's aerobic metabolism ability, which is the ability to use how much oxygen during exercise.

In addition to these physical examinations, there are dental examinations and intelligence tests.

These things were something Zhou Yi had never expected before, but they had all experienced them during the physical examination.

What Bartlett wants to compare now is the results of Zhou Yi's physical examination when he first joined the team and the results of the current physical examination.

In just eight months, Zhou Yi's heart rate changed significantly. Whether during exercise or during rest, his heart rate slowed down than before.

This is an important indicator of physical fitness.

Simply put, when the human body is exercising vigorously, the metabolic rate will increase sharply, and the heart will have to use reserve force to meet the body's need for increased metabolic rate by increasing the amount of cardiac beat per minute. The so-called cardiac beat per minute is the amount of blood ejaculation that is contracted and bulged on one side of the heart.

The blood is responsible for supplying oxygen to organs and tissues throughout the body, so the heartbeat output per minute can also be understood as the energy output of a person every time his heartbeats.

The work done by the piston of a car engine is similar to the amount of effort per distraction of a human being.

The higher the engine's power and the more power it is, the more people's hearts will produce, the greater the output energy, and the better the exercise ability.

When exercising, compared with the quiet state when not exercising, the cardiac output per minute will increase by four to six times or even more.

Generally speaking, ordinary people will increase their heart rate when exercising vigorously, which is why ordinary people will feel their heartbeat very fast when exercising vigorously. Because the heart does not accelerate contraction and expansion, it is impossible to increase oxygen supply.

Normally, the bleeding volume of the heart every time the pace is about 70 to 80 milliliters. After the amount of each period increases several times during exercise, the heart will bear huge load. Therefore, ordinary people who have not been professionally trained cannot maintain this high-load exercise for a long time, which can easily lead to cardiac arrest and other unexpected situations. In severe cases, they will die suddenly.

But the heart can be changed through training.

Long-term high-load endurance training, the heart rate will also decrease after enlargement of the heart cavity and thickening of the ventricular wall.

Players are always in a state of sympathetic excitement during training and competitions - the sympathetic nerve activity mainly ensures the physiological needs of the human body when it is tense - and at the same time, reflex causes a continuous increase in vagus nerve tension - the vagus nerve innervates the sensation, movement and secretion of organs such as the heart.

The advantage of slowing heart rate for exercise is that it can reduce the oxygen consumption of the myocardium. After all, cardiac pacing also requires oxygen to supply energy. If the heartbeats too fast, more energy and oxygen will be consumed, thus less energy is supplied to other parts of the body. This is why the heart rate is slowed down.

The heart rate slows down and the myocardial oxygen consumption decreases, which also prolongs the diastolic period, increases the perfusion time of the diastolic coronary artery and increases the oxygen supply to the myocardial muscle.

According to statistics, the heart rate of professional players is generally lower than that of ordinary people. Their heart rate when they are quiet or sleep is forty times a minute, which is not a special phenomenon.

So you can see a player's athletic level from your heart rate.

Zhou Yi's heart rate changes indicate that his athletic ability has increased, or specifically, his endurance has increased. Because the slower heart rate is basically related to endurance exercise.

This is actually very normal. Anyone can lower his heart rate after systematic and scientific training, which is a manifestation of the human body's self-regulation.

However, some people have strong self-regulation and adaptability, while others are poor.

Now Zhou Yi's two physical examination reports are placed in front of Klopp and Bartlett, and they find that Zhou Yi has made great progress in physical fitness.

You should know that eight months ago, Zhou Yi was an amateur rookie who had never received professional system physical training. After eight months, his physical condition had greatly improved. The improvement exceeded Zhou Yi's muscle strength - there were also muscle strength tests during the two physical examinations, so Zhou Yi's progress in this regard was relatively small.

This shows that Zhou Yi is a person who has great potential in physical fitness.

This is a good thing for Klopp, which makes him more optimistic about Zhou Yi's future.

Because in his mind, all his abilities are based on abundant physical fitness.

Whether it is Zhou Yi's football style or Dortmund coached by Klopp himself, they all require a lot of physical support.

If Zhou Yi is a player who increases physically slowly no matter how he trains, and does not know how to improve physical fitness, then Klopp's evaluation of Zhou Yi would have to be downgraded, and the decision to make the decision to buy him himself may have been wrong.

Although the club will not suffer much loss, not every young player can eventually become a talent. But after seeing Zhou Yi's talent, if he fails to become a talent, Klopp will be very sorry. Because Zhou Yi's talent is not something that any talented player can...

There are thousands of midfielders in this world, and there are not a few world-class midfield organizers, but only Xavi himself can play football like Xavi.

※※※

"His strength training is based on the average standards of the whole team, and there is no need to add any additional resources." Klopp began to tell the entire physical coaching team, which was actually mainly about Wanler, who was responsible for strength training.

Wanler nodded: "Okay. No matter how hard that kid trains, he can't become a bodybuilder like me. His muscle types are different. Maybe that kid is a marathon player."

Generally speaking, long-distance runners and marathon athletes rarely see strong muscle madmen. They are often thin, slender and dry, and have few muscles, but often have very good endurance. Especially those long-distance runners in Kenya, they all look like they are malnourished, but they can dominate the long-distance running industry. This is definitely not because Kenyans generally lack nutrition...

"But we can have more requirements for his physical training." Klopp turned to Bartlett.

"No problem. In terms of physical fitness, I think Zhou Yi is a talented player." Bartlett said.

Talented athletes can maintain higher training intensity and complete larger training volumes than ordinary athletes because their recovery cycle is shorter than that of ordinary athletes.
Chapter completed!