태권도 540° 회전 뒤 후려차기 시 수직도약을 위한 내딛기 각도에 따른 운동학적 비교분석

조혜수(Cho, Hye-Soo),전혁수(Jeon, Hyeok-Soo) 한국체육과학회 2020 한국체육과학회지 Vol.29 No.6

This study is a result of measuring the changes of muscle activity and time of staying in the air when the main movement is performed after starting steps with the angle of 45°, 90°, 135° in the leaping on the ground section, before performing Taekwondo 540° back thrashing kick. Then, the following conclusions were deduced. First, it is judged that it was difficult to activate muscle group required for the main movement in the phase of converting horizontal energy into vertical energy when performing 540° back thrashing kick with the angle of 45° and 135°. Second, when performing starting steps at the angle of 90°, the muscle activity shown from each section appears to be consistent with the results derived from previous preceding studies. Thus, to control horizontal energy, to convert condensed energy into vertical energy, and to reduce inertia moment which is produced during 180° ground turning before doing the main movement, the player should use tibialis anterior(TA) in the first phase, and the player should make enough time of staying in the air by using gastrocnemius(GCM) in the second phase. Taken these results together, to secure enough time of staying in the air when the players doing 540° turn around thrashing kick, it is judged that strength training must be in parallel with agonistic muscle which are tibialis anterior(TA), gastrocnemius(GCM) and synergistic muscle of the main movement.

태권도 숙련도에 따른 시각탐색전략과 의사결정능력의 차이 비교분석 : 3전 다승제 경기규칙 개정에 따른 발 기술변화 중심으로

조혜수(Cho, Hye-soo) 한국사회체육학회 2024 한국사회체육학회지 Vol.- No.96

Purpose: The purpose of the study is to analyze how changes in game rules impact athletes’ visual search strategies, technical adaptation, and decision-making. It aims to contribute to the development of effective training methods and game strategies. Method: The study involved 40 Taekwondo practitioners, divided into experts and novices (20 each), who participated in the study. They were assessed on their ability to predict front and back kicks. Independent t-tests were used to evaluate differences in eye-hand coordination, visual search strategies (fixation frequency, fixation ratio, saccade frequency), prediction accuracy, and reaction time between the groups. Results: Significant differences were found between experts and novices in eye-hand coordination, fixation frequency, fixation ratio, and saccade frequency. The analysis also revealed significant differences in fixation ratio between the two groups across various body regions, including the trunk, shoulders, foot dorsum, and thighs. In terms of decision-making abilities, there was a significant difference in prediction accuracy but not in reaction time between experts and novices. Correlation analysis showed a significant positive correlation between fixation ratio and prediction accuracy. Conversely, fixation frequency and saccade frequency exhibited significant negative correlations with prediction accuracy. Conclusion: This study investigated the impact of changes in competition rules, specifically the implementation of the three-win system in 2022, on visual search strategies. Despite rule modifications, minimal changes were observed in visual search strategies. Skilled players, however, exhibited a lower fixation frequency and a higher fixation ratio, focusing more on crucial visual cues such as the abdomen, as indicated in previous studies. This highlights the significance of establishing a visual pivot.

남자 고등학교 태권도 경량급과 중량급 선수들의 전문체력요인 비교분석

조혜수(Cho, Hye-Soo),전혁수(Jeon, Hyeok-Soo) 한국체육과학회 2021 한국체육과학회지 Vol.30 No.5

For the purpose of this study, a total of 18 male players of Taekwondo lightweight(n=19) and heavyweight(n=19) were assigned to each lightweight and heavyweight group, and the results obtained from conducting a professional physical strength factor analysis were as follows. First, in case of muscular strength factor, there were significant differences between heavyweight and lightweight groups(p<.01), and the heavyweight group was found to be superior to the lightweight group. For closed eyes and foot balance of balancing factors, there was a significant difference between lightweight group and heavyweight group(p<.1), and the lightweight group was found to be superior to the heavyweight group. In case of side step test as a Agility factor, there was a statistically significant difference between lightweight and heavyweight groups(p<.05). The heavyweight group was found to be superior to the lightweight group. and in case of eye-hand coordination as a coordination factor, there was a statistically significant difference between lightweight and heavyweight groups(p<.001). The lightweight group was found to be superior to the heavyweight group. Second, in case of lightweight group of players, a total two factors were extracted, the first factor was muscular endurance, muscular strength, agility, muscular power, the second factor was muscular coordination, In case of heavyweight group of players, a total two factors were extracted, the first factor was balance, agility, coordination, the second factor was muscular strength, muscular power. Taken these results together, even in the same Taekwondo, it is judged desirable to conduct training that meets each level of physical strength with a result of different physical strength factors are required between weight groups.

시각신호 훈련방법과 청각신호 훈련방법이 태권도 돌려차기 반응시간에 미치는 영향

조혜수(Cho, Hye-Soo),권태원(Kwon, Tae-Won),전혁수(Jeon, Hyeok-Soo) 한국체육과학회 2020 한국체육과학회지 Vol.29 No.6

The purpose of this study is to study of the effect on the reaction time of turning kick in Taekwondo according to the difference between dynamic auditory sense training and dynamic visuality sense training. Subjects, 20 college students majoring in Taekwondo selected, were divides each 5 students of each 4 groups in elite and non elite between the two training groups. Each group were trained foe 8 weeks, (5 days/week, 50min/day). And researcher measured reaction time before and after training. The results indicated that dynamic visuality sense training group affected the improvement of the reaction time of undominated and dominated leg rather than the dynamic auditory sense training group in Elite group before and after training. Whereas that effect in non-Elite group affected reversely.

태권도 숙련자와 비숙련자의 시기능요인 비교분석

권태원(Kwon, Tae-Won),조혜수(Cho, Hye-Soo) 한국체육과학회 2021 한국체육과학회지 Vol.30 No.5

This study conducted mean difference analysis by setting a total of seven items and detailed sub-factors presented in the precedent study to identify which visual function factors between skilled and unskilled athletes play an important role in Taekwondo in terms of information processing theory. The results showed that there were statistically significant differences between the two groups in eye-hand coordination, eye movement items, and there were no statistically significant differences between the two groups in dynamic visual acuity, moment visual acuity, peripheral vision, fixed pupil, and visual response. Summing up these results, we can recognize the key factors of Taekwondo athletes’ visual function were eye movements and eye-hand coordination that tracked visual cues related to software hypotheses. And in the eye movement, all the sub-factors indicated that the skilled group had a higher eye fixation frequency, eye fixation time, and low optokinetic frequency, optokinetic time compared to the unskilled group. This is because the skilled athletes accurately understand the characteristics of performing actions, such as the movement of the opponent’s joints, so it is judged that they are able to obtain prior visual cues to see at a certain place and at a certain point. Therefore, it is judged when performing Taekwondo perceptual skills, perceptual skill training that can accurately understand the movements of any exercise performance rather than the ability to see quickly should be carried out.

연령대에 따른 한국 고령자의 신체활동 주당 시간이 노쇠지수의 변화에 미치는 영향

마적(Ma Di),조혜수(Cho, Hye-Soo),권태원(Kwon, Tae-Won) 한국체육과학회 2023 한국체육과학회지 Vol.32 No.6

“Exercise is good medicine” is well known, but the optimal weekly time dose of physical activity across age ranges of older adults is still unknown. In this study, 2,224 respondents who satisfied the criteria from the KLoSa Wave 8 survey were selected for observation. Based on the World Health Organizations recommended weekly physical activity time criteria, the respondents were divided into three groups: a group of less than 150 minutes, a group of 150-300 minutes, and a group of more than 300 minutes. Frailty index scores were also created using 65 variables related to health. We compared the odds ratios between the dose of physical activity time and the incidence of frailty in Korean older adults of different age ranges. The results showed that at 60-69 years range, the optimal duration of physical activity is the group of less than 150 minutes(OR: 0.9873; 95% CI: 0.9768 to 0.9978); at 70-79 years range, the optimal duration of physical activity is the group of 150 to 300 minutes(OR: 0.9960; 95% CI: 0.9921 to 0.9999); at 80 age and older range, the optimal duration of physical activity is the group of more than 300 minutes(OR: 0.9960; 95% CI: 0.9930 to 0.9991). We observed that (1)the duration of physical activity required to reduce frailty risk increased with age, (2)the proportion of decrease in the risk of frailty decreased with age. (3)And, we determined the optimal duration of physical activity required for age ranges.

태권도 앞 꼬아서기 자세의 옆차기 숙련자와 비숙련자의 근 활성도 비교 분석

권태원(Kwon, Tae-Won),조혜수(Cho, Hye-Soo),유병호(Yoo, Byeong-Ho) 한국체육과학회 2020 한국체육과학회지 Vol.29 No.4

Taekwondo Poomsae competitions use a deduct scoring method. The side kick corresponds to the 3rd level of difficulty and it is reported that the side kick makes people deducted frequently. The purpose of this study is to provide data to instructors and improve performance for Poomsae players by comparing and analyzing the muscle activity of the muscles on the side kick of the front cross stance position. Seven Taekwondo Poomsae elite practitioners and seven Taekwondo Poomsae non-skilled workers were selected and the side kicks in the front cross stance position were analyzed using EMG to compare muscle activity. The results of this study showed that 6 out of 8 muscles in the skilled group were superior to those in the unskilled group, and the important factors in the skilled group were the biceps femoris muscle, erector spinae muscle, and abdominal muscle. Non-skilled people performed side kicks inefficiently using only certain parts of the muscles, while skilled people performed side kicks in harmony and efficiency on muscles. Thus, it can be seen that unskilled people should perform side kicks using trunk muscles that bend the lower limbs muscles as much as possible toward the body to create a minimum angle for the knee joint and support them to hit(strike) the target point like skilled practitioner’s performance form.

남자 태권도 품새선수의 발차기 수행 시 기합 발성타이밍과 발음유형에 따른 등속성근기능 비교분석

손유남 ( Son Yoo-nam ),조혜수 ( Cho Hye-soo ) 국기원 2022 국기원태권도연구 Vol.13 No.2

목적 이 연구는 태권도 발차기 수행 시 기합 발음의 유형에 따른 등속성근기능의 최대근력과 반복 당 평균파워를 비교분석하는 것에 목적이 있다. 방법 본 연구의 목적을 달성하기 위해 대한태권도협회에서 인정하는 전국규모의 대회에서 입상경력이 있는 대학생 엘리트 품새 선수들을 판단표본추출방법을 통해 총 12명을 선정하였다. 수집된 자료는 기술통계, 일원분산분석을 사용하여 분석하였다. 결과 기합발음과 발성타이밍 유형에 따른 발차기 시 슬관절의 신근은 통계적 유의성을 나타냈으며, 사후 분석결과 차는 동시 ‘파’ 기합에서 가장 높은 것으로 나타났으며, 굴근도 마찬가지로 통계적으로 유의성을 나타내 사후분석을 실시한 결과 ‘차는 동시’, ‘차고 난 직후’에 ‘파’에서 가장 높은 최대근력을 나타냈다. 둘째, 반복 당 평균파워는 신근과 굴근 모두 통계적 유의성을 나타내지 않았다. 결론 수행과제로 제시 된 각각의 기합 발성타이밍과 발음유형에 따라 발차기 최대근력 결과의 유효성이 차별적으로 나타나 발차기 수행 시 차는 동시에 파열음의 기합을 적용한다면 발차기의 최대근력을 높일 수 있을 것으로 판단된다. Purpose The purpose of this study was to analyze and compare the peak torque and average power per repetitions of isometric control when performing Taekwondo kicks depending on the type of shouting pronunciation used. Method To accomplish the purpose of this study, this study conducted a judgmental sampling of 12 elite college student Poomsae athletes who had won prizes at national competitions recognized by the Korea Taekwondo Association. One-way ANOVA and descriptive statistics were used to analyze the data collected. Results First, the type of shouting pronunciation and vocalization timing were associated with the extensor of the knee joint when kicking. Duncan scored the highest in the 'Pa' shout while kicking. Flexor also showed statistical significance. In post-hoc:Duncan, the highest peak torque was measured in 'Pa' at the same time as 'kick' and 'right after kick'. Second, neither the flexor nor the extensor showed statistical significance in the average power per retention. Conclusion Depending on when and how each shouting is given as a performance task, the effectiveness of the kick peak torque result can differ. As a consequence of this study, it has been concluded that when plosive sounds are shouted simultaneously with kicks, the peak torque of kicks will increase.

국가대표 태권도 시범단과 품새단의 전문체력요인 비교분석

권태원(Kwon, Tae-Won),조혜수(Cho, Hye-Soo),어진수(Eo, Jin-Su) 한국체육과학회 2018 한국체육과학회지 Vol.27 No.5

The purpose of this study was to convey the physical ability factors that affect Tae Kwon Do(TKD) demonstration and poomsae team for raise prospective TKD demonstration team and poomsae members by the coaches and instructors. test for 9 physical ability tests that conducted in this study were as follows: grip s trength, sit-ups, sargent jump, broad jump, harvard s tep test, s ide step t est, s it & reach, blind balance, body reaction test, and coordination. The study would provide the information about the physical ability factors that contribute to enhance TKD demonstration and poomsae technique level and ability. The purposive sampling method was conducted with 10 physical ability test, and the physical ability of two groups were compared. The samples were 8 Korea national TKD demonstration members and 8 sparring athletes who won the national level competition. The results and conclusions were as follows: 1. In the physical strength measurement results of the national Taekwondo demonstration team and Poomsae players, demonstration team is excellent at muscular strength, reflexes, reaction of the whole body, and Poomsae players are excellent at flexibility compare to the demonstration team. 2. The important physical factors of Taekwondo demonstration team and Poomsae players are like these. The first factors were reflexes, muscular strength and the second factors were flexibility, reaction of the whole body. 3. When we see the characteristics of a demonstrated movement of Taekwondo, the players need to develop all their reflexes, muscular strength, but the most important factors in improving the demonstration power are reflexes and muscular strength, 4. As we see the characteristics of Taekwondo Poomsae movement, in the static movement, the players must be carried out their skills with full power, so flexibility is the most important body strength factor for improving Poomsae performance capacity.

대학 태권도 겨루기선수의 수련정도에 따른 전문체력과 Trunk의 등속성 근 기능 비교 분석

권태원(Kwon, Tae-Won),조혜수(Cho, Hye-Soo) 한국체육과학회 2019 한국체육과학회지 Vol.28 No.3

This study is to do professional physical strength according to the level of training of university Taekwondo competition player and a comparative analysis of Trunk"s isokinetic myofunction, in order to achieve the purpose of the study, 11 physical tests of 7 factors were conducted on 7 skilled and 7 non-skilled people, and the following conclusions were deducted. 1. In the case of skilled groups, they were superior in explosive muscular strength, quickness, muscular strength, reaction time, coordination compared to the non-skilled group. 2. The main physical factors of competitive skilled players are the first factor is explosive muscular strength, the second factor is quickness, the third factor is flexibility, and the fourth factor is muscular strength. 3. In terms of the characteristics of Taekwondo competition, explosive muscular strength, quickness, muscular strength, reaction time, coordination are all important, but explosive muscular strength is the most important of them. 4. In the case of non-skilled people, training will have a positive effect, depending on the physical strength factors analyzed by the skilled people. 5. In the case of isokinetic myofunction, according to the characteristics of Taekwondo, it will help improve athletic performance with combining the forms of training that circuit training with muscles contraction or Cybex to maximize the force from all angles.