Trial of the contraction method for transversus abdominal muscle with taping: focusing on the muscle thickness of external oblique, internal oblique and transversus abdominal muscles / 体力科学

Abdominal draw-in is a functional transversus abdominal muscle exercise to acquire the contraction. However, it is difficult for even healthy subjects to selectively contract the deep transversus abdominal and internal oblique muscles without over-contraction of the superficial rectus abdominis and the external oblique muscles. This study examined whether the transversus abdominal muscle is selectively contracted by our taping method. The subjects were 20 healthy males. Using ultrasound, we compared the thickness of external oblique, internal oblique, and transversus abdominal muscle among no taping, kinesio taping and abdominal muscle activation taping in the standing position. The thickness of transversus abdominal muscle significantly increased in the activation taping more than the other methods. This study showed that abdominal musculature activation taping made it possible to contract the transversus abdominal muscle selectively.

Trial of a new lower limbs and trunk functional evaluation for pitcher -physical characteristic of the baseball player with throwing disorder- / 体力科学

Pitching motion is made up by three-dimensional whole body movement. Pelvic and trunk rotation movement is important for the prevention of throwing injuries. Throwing is not a simple rotation movement. Evaluation should reflect muscle strength, coordination, and pitching motion characteristics. We have devised throwing rotational assessment (TRA) similar to throwing as the new evaluation of total rotation angle required for throwing. The purpose of this study was to introduce the new method and to examine the characteristics of players with throwing disorders. The subjects were 76 high school baseball pitchers who participated in the medical check. Pain-induced tests were elbow hyperextension test and intra-articular shoulder impingement test. Pitchers who felt pain in either test were classified as disorder group. TRA evaluation was performed as follows. In the positions similar to the foot contact phase, rotation angles of the pelvis and trunk were measured. In the position similar to follow through phase, the distance between the middle finger and the second toe was measured. All tests were performed in the throwing and opposite direction. Twenty five pitchers were classified as disorder group. All TRA tests in healthy group were significantly higher in the throwing direction than in the opposite direction, but there was no significant difference in the disorder group. Disorder group had significantly lower average rotation angles of the pelvis and trunk in the throwing direction and rotation angle of trunk in the opposite direction than the healthy group. Restrictions on TRA reflecting the complex whole body rotation movement may be related to the throwing disorder. This evaluation is a simple method. It would be useful early detection of throwing disorder and systematic evaluation in medical check, as well as self-check in the sports field.