Examination of the effective trunk muscle training method-The transvOriginal Articleersus abdominis muscle and the internal oblique muscle measure muscular thickness of different movement-

Recently, many people have observed the value of trunk muscle training. Trunk muscle training is divided into Local muscle group and Global muscle group, and it is thought that improving local muscle group is what is important, because if the body's trunk has stability and flexibility, limbs will move quickly and movements can be done correctly. In this research, an ultrasonic wave machine was used in order to measure muscular thickness. The subjects were eight people (29.6±6.5years) who seemed to have problems with the transversus abdominis muscle due to low back pain. Each subject performed four exercises, and the thickness of the external oblique muscle, the internal oblique muscle, the transversus abdominis muscle was measured before and after the exercise. In this study, of the four exercises, the exercise using the double redcord training resulted in thefinding that before the exercise, the internal oblique muscles were thicker than the external oblique (p<0.05) but following the exercise, the internal oblique muscle were thicker than the transversus abdominis. When analyzing the impact of the exercise on the various muscles, it can be said that based on before and after measurements, the internal oblique was thinned, and the transversus abdominis become thicker (p<0.05). It canbe said that using this double redcord training method will decrease the muscular thickness of internal oblique, while increasing the thickness of the transversus abdominis. The result of other types of exercise led to an increases muscular thickness of both the internal oblique as well as increasing the thickness of the muscle of transversus abdominis (p<0.05). The training methods of the past seem to need reexamination when thinking about muscular thickness of internal oblique increasing because it moves from the purpose of strengthening the activity of Local muscle training by strengthening the activity of Global muscle. The feature of double redcord training changes instability into stability to maintain proper posture. Double redcord training is unique in thatit suspends all four limbs, and has the subject do the exercises while suspended. In other words, it forces the subject to strive for stability in a unstable high stress environment. To stabilize posture, speedy individual muscle contractions need to cooperate with other muscle group contractions. The role of the transversus abdominis in this cooperative effort is critical. It was able to be concluded that double redcord training was a useful method from the viewpoint of effective body trunk training.