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Short and long-distance athletes who give good time have different “muscle quality” Juntendo University studies

Athletes who have”hard muscles that are hard to stretch and shrink easily” in short-distance running in track and field, and athletes who have”soft muscles that stretch and shrink easily” in long-distance running, each issue a good time. The research group at Juntendo University summarized such interesting research results. An interesting study that first clarified the relationship between ‘muscle quality’ such as muscle hardness and softness of athletes who had not been clarified until now and ‘competition performance’ seems to be a reference for considering more appropriate training methods. The paper was published in the electronic version of the Journal of the Sports Medicine Society of the United States.

According to a research group led by Naokazu Miyamoto of Juntendo University Graduate School of Sports and Health Sciences,” the hardness and softness of muscles” is generally considered to be”the hardness that you feel when you touch them.” it’s not like that. It had not been clear up to now whether it is better than the muscle which becomes a spring is soft and easy to shrink or hard and hard to shrink when the player actually puts out a good time.

Therefore, the research group focused on the athlete as a movement using the muscle “spring”.We examined the relationship between the hardness and softness of the athlete’s muscles and the competitive performance of Sprint and long・distance runners. Specifically, we examined the hardness of the “lateral broadway” of 22 players, respectively, in both active and long-distance running. The lateral vastus muscle is one of the muscles that make up the quadriceps femoris at the front of the thigh and is the main muscle that acts on the extension of the knee (knee) joint. Ultrasonic image diagnostic apparatus suitable for examining the part aimed without damaging the hardness of the living tissue was examined.

As a result, it was found that the stiffness of the muscle for the sprinter and the time of the 100-meter run were good for the time of the athlete with the muscle which is hard and hard to stretch and shrink easily. Also, in the 5000-meter time of long-distance runners, the time of the athletes with soft and elastic muscles was good. From this fact, it became clear that the characteristics of the sport such as short distance and long distance were different whether it was suitable for the same track and field in which the muscles were soft and easy to shrink or hard and hard to shrink in order for the athlete to get a better time.

The research group suggests that athletes need to train according to the characteristics and quality of their muscles, and by examining in detail what kind of training can make muscles harder and harder to stretch and shrink, or soft and stretchable, it is pertinent to look at the method. it’s a great way to keep up with the Times.

“Hardness” of the muscle measured in the study. By using an ultrasonic diagnostic imaging device called”ultrasonic shear-wave Elastography,” the hardness of the muscle is measured not as the hardness of the muscle when the muscle is pushed in, but as the hardness of the muscle, which is difficult to stretch and shrink (the arrow direction). When performing physical exercises, muscles stretch and contract in the direction of the arrow, it is important to measure the stiffness of this direction in order to evaluate the function of the muscle. The right figure can quantify the hardness of the red frame in the typical example of the measurement image.

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