Earticle

The purpose of this study was to investigate and compare lower limb isokinetic muscular strength of <23㎏/m2 and >23㎏/m2 population at the same height and muscle mass. For this purpose, 20 subject(10 <23㎏/m2, 10 >23㎏/m2) were selected. The result were as following. The peak torque, average power, total work, maximal voluntary isometric contraction(MVIC) in time of flexion and extension 60°/S, 180°/S no significant difference, In conclusion the muscle mass seems to be a function of underlying muscle strength and contributing variables of isokinetic lower limb flexion and extension strength in men who are >23㎏/m2 are not body fat.

The purpose of this study was to investigate the effects of lumbar rehabilitation exercise based on scientific and effective training programs, and to contribute improvement of athletic competence for Taekwondo players. The subjects of the present study were five high school Taekwondo players(flat back group: M = 1, F = 1) who felt a lumbar pain. According to each posture, the subjects were performed lumbar rehabilitation training for eight week, and the effects of lumbar rehabilitation training analyzed lumbar extension strength, and change of lumbar pain were as follows: 1. The lumbar extension strength of All subjects increased during period of eight week rehabilitation training, especially the female flat back subjects found a high rate of improvement. The male flat back subject found the continuous rate of increase, on the other hand the male subject found a high rate of improvement at the early stage of training. In general. after rehabilitation training lumbar extension strength of whole subjects was increased at the level of p<.05. 2. After rehabilitation training the lumbar posture of whole subjects was returned to normal condition at the level of p<.01.

Background: Recently, a number of snowboarders and skiers have been increasing dramatically. The winter sports has several advantages such as maintaining or enhancing physical fitness as well as increasing psychological satisfaction. However, snowboarding and skiing related injuries are also increasing. Among these injuries, the frequency of concussion is increasing. Purposes: The purposes of this review are to provide updated information about sports related concussion in general including definitions of concussion, incidence rate of concussion in snowboarding and skiing, and methodological issues of the sport injury study in future research. Methods: To find literature, the following Electronical Data Base was searched(Medline, National Center for Biotechnology Information(NCBI), Koreastudies Information Service System(KISS), and theses. The searching terms were limited to either Korean language or English language and the published year from 1990 to 2006. Results: In results, there are not many research in snowboarding and skiing related concussion. Incidence rate of concussion in snowboarding was high(11 per 100 snowboarder-exposures). Overall, frequency of concussion injury occurred from 3~69%. However, the incidence rate of skiing related concussion could not calculate because there are several methodological problems with skiing related concussion research. Conclusion: In conclusions, there are few research in the winter sports related concussion. Incidence rate of snowboaring related concussion is high. By the way, due to methodological limitations, the incidence rate of skiing related concussion could not measure. Therefore, more research are required with appling appropriate methods in these two winter sports.