Seminar: “1. Localization of the center of mass of the curved human body 2. Velocity distribution …”
1. Localization of the center of mass of the curved human body 2. Velocity distribution in order to win or to break a record time based
Speaker: Wod S. Erdmann, PhD, DSc (Hab.)
Department of Biomechanics and Sport Engineering
J. Sniadecki University School of Physical Education and Sport Gdansk, Poland
From 10:00 to 11:00 a.m.
In Room MA3 of the University of Rome Foro Italico
Localization of the center of mass of the erect human body is easy using a direct method with the help of a board and scale. In order to localize center of mass of the curved body on a picture (photograph, video frame) one needs to use one of the indirect methods. Here mass and location of centers of mass of the body parts is needed. For several years the trunk was treated as a one segment. When the trunk was divided onto five parts: thorax, abdomen, pelvis, two shoulders – the accuracy of localization of the center of mass was much better. Here, during basic research, image methods of the inner pictures of the human trunk were utilized (CT, MRI). The procedure of dividing the trunk onto several parts is needed especially, e.g. in gymnastics, athletics (high jump, pole-vault), fighting sports (wrestling, judo). In order to win or to break a record (own, national, continental, world) competitors use different tactics. Some (and there is a lot of them) start with a higher speed at the very beginning, while the others (and there is just a small group of them) start with a moderate speed. Those who start quicker are sometimes so good that others can not cope with them. But usually they run, swim, ride slower along the further distance. If they wanted to win or to break a record they fail to do this. There was found a tendency that those who win or break a record usually start with moderate velocity and at the further distance their velocity rises. In addition the dispersion of velocity from the trend line should be minimized. Even the best athletes in the world had successful and unsuccessful approach to break a record. When it was unsuccessful it was found their distribution of velocity was such that it was higher at the first half and lower at the second half of the distance.