양궁 백 텐션 국면에서 최우수 양궁선수의 동작특성 평가

Abstract

J. H. YI, C. K. HAH, J. S. RYU, and K. C. KIM, Evaluation on Motion Features of the World's Second Archer during Back-Tension in Archery. Korean Journal of Sport Biomech anics, Vol. 17, No. 3, pp. 197-207, 2007. It has been reported that Back-Tension played a significant role in archery (Lee & Bondit, 2005; Kim, 2007) but there are a few researches related Back-Tension in Korea recently. Therefore, t he purpose of this study was to investigate archery back tension technique for the second ranked archer in the World and to find ways to improve performance. A subject(height: 185cm, mass: 82kg, years: 21yrs, careers: 12yrs ) who is a number of national team and the second ranked archer in the World authorized by FITA (Federation Internationale de Trial Arc) was perticipated in this experiment. When shooting 60 shots(12 ×5), shooting motions were recorded with 7 infrared cameras and 2 ultrahigh-speed cameras. A QTM and an Auto Track were used to a cquire raw data. The sampling rates of both cameras were 200 Hz. and 1000 Hz. respectively and data were fi ltered using a fourth order Butterworth low pass filtering with a cutoff-frequency of 30Hz. The parameters were calculated with Matlab6.5 and analyzed with SPSS11.0. After Pearson's correlations between 8 parameters were analyzed , 5 parameters from 13parameters that affected records were analyzed with multiple regression analysis (Enter order: x 1, x2, x3, x4, x5). The results were as follows: 1. Comparing between parameters according to scores, the patterns of horizontal and vertical angular velocity(av.) of scapular relative angle was different between 8 score and 9 or 10 scores.2. The correlations of parameters that affected records were a horizontal av.(x1, p=.032<.05) and a vertical av.(x3, p=.033<.05) of scapular from release to delivery in KB back-ten sion (anchoring-delivery).3. The decision coefficients(R2) of above two parameters and th ree parameters selected by experts that may affect record, that is, an absolute trunk angle(x4) from in KKC back-t ension (anchoring-release) and a horizontal relative scapular angle(x2) and an absolute trunk angle(x5) from release to delivery in KB back-tension were 7.7%(x1), 0.1%(x2), 8.5%(x3), 0.7%(x4) and 0.9%(x5) in sequence. 4. The multiple regression equation was a y= -1.16E-2 x1 + 0.10 9 x2 + 3.437E-2 x3 + 6.139E-2 x4 + 0.117 x5 + 3.420 In conclusion, a total contribution was low ,that is, R2(17.9%) suggested that on the one hand, Lim's motion may not depend on a certain factor because his postural factors aff ected shooting motion are some stable on the other hand, unknown factors may exist(e.g. psychological, physiologic al factors etc.). Further study of EMG patterns of muscles and anatomic considera tion related to shoulder girdle and scapular bones may help to identify mechanism of Back-Tension. KEYWORDS : BACK TENSION, REGRESSION EQUATION, CORRELATION, EMG