Background: Purpose In this study, the purpose of this study is to identify the determinants of winning and losing in taekwondo by applying decision tree analysis, one of the data mining techniques, based on the 2022 World taekwondo championships women’s competition. Methods: 272 women’s games in the taekwondo championships in Guadalajara held by the WT in 2022 were used. For data processing, an independent sample t-test was performed for differences in game content variables according to the win/lose group, and a decision tree analysis was performed to confirm game content variables affecting the win/lose group. To check the predictive power of the model, classification accuracy, standard error, and misclassification estimates were calculated. All statistical significance levels were set at 0.05. Results: First, it was found that there was no statistically significant difference only in body attack (attempt) and number of kicking variables according to the winning and losing groups(p > .05), and there were differences in all other game content variables(p < .05). Second, as a result of conducting a decision tree analysis to confirm the determinants of winning and losing in taekwondo sparring, winning situation, tie situation, and number of kicks were identified as important variables. Conclusion: The World taekwondo championships are analyzed in the currently changed taekwondo competition rules to identify important factors, and at the same time, based on this, data-based coaching is expected to improve performance.

Sports injuries frequently occur in athletes during competitive activities and practice routines, and the causes include cumulative fatigue from repetitive training, lack of warm-up exercises, and absence of motivation during competition. We aimed to determine the frequency and characteristics of lower extremity injuries in high school Taekwondo athletes. This study evaluated lower extremity sports injuries in 473 high school Taekwondo athletes. We conducted frequency and cross analyses. The questionnaire tools were developed to identify the characteristics of lower extremity injuries in Taekwondo athletes. Results: For injury by person, thigh injuries and re-injuries were most frequent. In non-contact injury, ankle injuries and re-injuries were most numerous. In the men’s lightweight category, thighs were injured the most in injury by person and ankles suffered the most non-contact injuries. In the men’s heavyweight category, the number of knee injuries was highest in injury by person, and the number of ankle injuries was highest in non-contact injury. In the women’s lightweight category, thighs suffered a higher number of injuries by person, whereas ankles had the highest number of non-contact injuries. In the women’s heavyweight category, thighs had the highest number of injuries by persons, whereas ankles had the highest number of non-contact injuries. The causes of ankle injury in weight classes were different in the two sexes. Conclusion: In this study, we confirmed that the sports damage suffered by student athletes mainly occurs as injuries in training situations without opponents. Our findings could help formulate basic guidelines for preventing sports injury in Taekwondo.

Background. Although the World Taekwondo federation currently applies the APIS ranking method to calculate the Olympic rankings, some limitations exist. Objectives. This study applies the PageRank model to Olympics Taekwondo rankings. Methods. The 2015-2018 World Taekwondo Grand Prix competition results for women's four weight classes (49kg, -57kg, -67kg, +67kg) were used as research data, totaling 624 games. Excel and NetMiner programs were used to calculate the PageRank value, and the damping factor d was set to 0.15. Results. Player of People's Republic of China (CHN), WU, and JINGYU, was ranked as No. 1 in the case of -46kg Olympic women's weight class, and KIM, SO-HUI, player of Korea(KOR), and WONGPATTANKAKIT, PANIPAK, player of Thailand (THA), were ranked second. At -57kg, Great Britain (GBR)'s JONES, and JADE was ranked 1st, Turkey (TUR)'s TARTAR, Nauru (NRU) (2nd and Latvia (LAT)'s TARVIDA, INESE the 3rd. At -67kg, Lvoly Coast (CIV)'s GBAGBI, RUTH was ranked 1st, KOR's OH, HYERI player, and TUR's TATAR, NUR. In the +67kg, CHN's ZHENG, SHUYIN ranked number 1, GBR's WALKDEN, BIANKA ranked second, and Poland (POL)'s KOWALCZUK, AKEKSANDRA ranked third. Second, as a result of comparing the validity of the PageRank model and the APIS model, the validity of the PageRank model was relatively higher in all four weight classes. Conclusion. The page ranking method was found to be more valid for measuring the ranking in Taekwondo competitions than the current APIS system, which we believe the page ranking method is suitable for measuring rankings in various sports events other than Taekwondo.

Background: We developed a reference point by applying a doping attitude and propensity tool to prevent doping in sports athletes. Methods: Performance Enhancement Attitude Scale (PEAS) was investigated on 768 registered athletes with the Korea Sports Association. Independent sample t-test and ANOVA were applied to confirm the doping attitude and propensity according to anti-doping education and event type. To establish the criteria for PEAS, the intersection was confirmed through the group comparison method, and EasyOZ by Excel was applied at this time. In addition, accuracy, sensitivity, and specificity were calculated to confirm the validity of the reference point. Results: First, in the case of anti-doping education, it was confirmed that more than 90% of the anti-doping education was completed in all sports. Second, there was no statistically significant difference in PEAS according to the type of sport, and there was only a difference in the PEAS according to whether or not anti-doping education was provided and whether or not there was anti-doping education. Third, the point of contact established in the group comparison method was 29.5 points, and as a result of validating the validity based on this, 30 points were found to be the most suitable index. Conclusion: This study could be used as important information in that it suggests a different method for evaluating PEAS and establishes a reference point that can be used more effectively in the actual field.