The more Qin Xueyang listened, the more confused she became, listening to Lu Kai's talk about fast shrinking white muscles, her back door suddenly became very tense, in her opinion, it should be fast shrinking white muscles, right?

Lu Kai saw that Qin Xueyang was stunned, and told her with a smile: "You may not know much about this, but Master Pao heard that he started working out a long time ago, so he should have some understanding of the muscle classification of the human body." Pen ~ Fun ~ Pavilion www.biquge.info"

Zhang Qiyang said truthfully: "I definitely know something, but I don't know as much as you professional athletes." ”

Lu Kai said: "Actually, these are very easy to understand, the muscles of the human locomotor system are basically striated muscles, and most of them are attached to bones, so they are called skeletal muscles." According to the type of bone muscle, it can be divided into three categories: slow-contracted red muscle, fast-contracted red muscle and fast-contracted white muscle. ”

Qin Xueyang snorted the ice gourd and said, "It's so complicated. ”

Lu Kai said: "It's not complicated, this is easy to understand, you remember, red muscles belong to the endurance type, and white muscles belong to the explosive type." White muscle fibers belong to motor motor nerve units, responsible for voluntary movement, also known as rapid motor units, such as rapid explosive exercise, the main thing to get exercise is white muscle fibers. The white muscle fibers are thicker in cross-section, so the muscle groups are easy to develop and thick. You look at the Jiao Alan who just passed, her thighs are long and strong, very similar to that of boys, right? It is because the white muscle fibers in her thigh muscles are very developed, this level of development is rare among female athletes, and if she trains well in the future, she is likely to create record-breaking results, this is the legendary talented athlete. ”

Lu Kai said to Zhang Qiyang again: "Pao Ye, you too, I think you have to do a muscle group test, and you will definitely find out that the proportion of white muscle is high." People with super explosive power have high white muscle. White muscle fibers contain more myofibrils, less myoglobin and cytochrome, and the contraction speed is fast and powerful during exercise, and the explosive power is extremely strong, but the staying power is poor. I don't know if you have this kind of characteristic, you are very good at sprinting, and you shouldn't be very good at long-distance running, right?"

Zhang Qiyang is not good at answering Lu Kai, because he thinks that his body, durability is better than explosiveness, according to the previous experience of the original owner, his long-distance running performance is much better than sprinting, he has been following her mother to participate in marathons since he was a teenager, every time he runs the whole way, and his endurance is amazing.

It's just because Zhang Qiyang's brain has become extremely developed now, and his ability to control muscles has reached a height that ordinary people can't reach, that he shows amazing explosiveness. But if you look purely at the muscle type of his body, it should be that the red muscle is greater than the white muscle.

Lu Kai continued to tell the two: "Red muscle fibers belong to tension motor neurons, which 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. ”

Lu Kai concluded: "The distinction between red and white muscles is based on the speed of muscle contraction or the density of microvessels, which is a relatively early division. According to the activity function of the skeletal muscle, the types of skeletal muscle fibers can also be divided into slow contraction muscle and fast contraction muscle. Although slow contractile muscles are all red muscles, fast contractile muscles can be divided into two categories: red muscles and white muscles. I won't tell you about it if it's too fine, in short, I think that your white muscles must be very developed, and you are an absolutely talented sprinter. ”

Qin Xueyang asked: "Are these muscle fibers innately classified? For example, you athletes are born with more white muscle fibers?"

Lu Kai said: "There must be an innate influence, but acquired training is also essential. If you don't practice diligently, no matter how good an athlete is, you will eventually become an ordinary person in terms of physical function. ”

Zhang Qiyang pointed at Qin Xueyang with a smile and asked Lu Kai: "Do you think she has more white or red muscles?"

Lu Kai knew that the relationship between Qin Xueyang and Zhang Qiyang was not ordinary, so he naturally didn't want to offend Qin Xueyang, and said with a smile: "It's hard to say. Generally, people who sit in the office, the ratio of the three types of skeletal muscles such as slow-contracted red muscles, fast-contracted red muscles and fast-contracted white muscles will account for about 50%, 25% and 25%, and the proportion of slow-contracted red muscles is definitely the highest. ”

Qin Xueyang was puzzled: "Why?"

Lu Kai said: "Slow-contracted red muscle has the highest aerobic capacity and fatigue resistance, but it has poor glycolytic (anaerobic) capacity, slow contraction rate, and low muscle strength per exercise unit, which is a low-intensity, long-term exercise muscle type. Most of the jobs done by white-collar workers are low-intensity, but long-term exercise.

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 have the best of both muscles.

Generally speaking, when the human skeletal muscles exert force, if the way of exertion is relatively slight, only the motor units of the slow-contracted red muscle participate in the contraction and generate force, and with the increase of the strength of the skeletal muscle, the motor units of the fast-contracted red muscle and the fast-contracted white muscle participate in the contraction force respectively. Therefore, when the intensity of exercise increases, the skeletal muscles have to shorten the exercise time due to fatigue due to the characteristics of the slow-shrinking red muscles, and when the intensity of exercise increases, the muscles have to shorten the exercise time due to fatigue because of the characteristics of the fast-shrinking white muscles.

To sum up, if a person has a very high proportion of fast-shrinking white muscles, then the person's short-term explosive athletic ability will be excellent, and if there are more than 90% of the slow-shrinking red muscles in the skeletal muscles, then this person is likely to be a marathon champion regular. ”

Qin Xueyang probably understood, and boasted: "It seems that I am full of red skin, although I have no explosive power, my endurance is very good, if I get rid of all the fat, I may win a few marathon championships." ”

Zhang Qiyang hit her: "Don't stinky fart, you can get rid of all the fat in this body, you don't have to win the marathon championship, you are directly the weight loss champion." ”

Lu Kai said in passing: "Xiao Qin, if you really want to lose weight, I can introduce you to a reliable fitness coach." I have a younger brother who works as a fitness coach on Dawang Road, and his specialty is to help people exercise and lose weight, and he is an expert in this field. If you're interested, I can put you in touch with him. ”

Qin Xueyang looked away and said, "This ...... Forget it. I haven't eaten enough yet, and when I've eaten all the delicacies in the world, I'll seriously consider losing weight. ”

Zhang Qiyang continued to hit her: "You don't think about losing weight, I'll give you the words, you can't lose weight in your life, you can live your life with a wide heart and a fat body." ”