Purpose The purpose of this study was to explore the optimal model for winning medal on vault event of men's gymnastics. Specifically, decision tree analysis was used to explore, first, for the optimal conditions for qualifying top 8th player that have high possibility into final round, and second, for the optimal model for obtaining the medal of the vault event. Methods Data were collected for five official competitions (Olympics, Asian games, and International championship, etc.) organized by the Federation of International Gymnastics (FIG) from 2013 to 2016. In this study, the data of 626 vault players were collected. Also all of these players performed 921 vault skills for qualifying round or final round. Five predictor variables for estimating for qualifying into the final round and for obtaining the medal of the vault event were selected; nationality, difficulty score, acting score, additional penalty score, final score. Results The results is as follows. Overall, it was confirmed that the optimal model for entering into the final round was the difficulty score of vault event. The optimal model for entering into the final round estimates 81.2% when condition would be the 5.6 or higher of difficulty score and 8.6 or higher of the acting score. The optimal model for winning medals was 86.7%, which means that when condition would be the 6.0 or higher of difficulty score and no additional penalty score. Conclusions This models can be used as a basic data for establishing a strategy for medal acquisition of vault event of gymnastics.
Purpose This study aimed to investigate the effects of acute cold stress (10℃, 0℃) compared with ordinary temperature (20℃) on exercise performance and physiological response at rest and during exercise. Methods A total of 10 healthy men (21.55 ± 2.16) were selected. In each environmental condition (20℃, 10℃, 0℃), the three testing order was randomly selected at crossover, and there was a week interval between the graded exercise test (GXT). On the testing day, they remained resting for 30 min in each environmental condition. Dependent variables (body temperature, energy metabolism parameters, skeletal muscle oxygenation profiles, and exercise performance parameters) were measured at rest and during GXT. Results In body temperature, at each environmental condition, there was a significant decrease (p<.05) at 10℃ and 0℃ compared with 20℃ after exercise, and in the difference depending on the environment at rest. After exercise, the body temperature significantly decreased (p<.05) in proportion to the decrease in temperature. There was no difference in heart rate and blood lactate level in energy metabolism, and the respiratory exchange ratio was significantly higher (p<.05) at 0℃ than 20℃. Minute ventilation (VE), oxygen uptake (VO2), and carbon dioxide excretion (VCO2) were significantly lower (p<.05) at 0℃ than 20℃ and 10℃ at various exercise load. All skeletal muscle oxygenation profiles did not show significant changes at rest and during exercise. In exercise performance, maximal oxygen uptake was significantly lower (p<.05) at 0℃ than 20℃, and exercise time to exhaustion was also significantly lower (p<.05) at 0℃ than 20℃ and 10℃. Conclusion Acute cold stress induces deterioration of exercise performance via a decreased body temperature and an increase in VE, VO2, and VCO2 during the same exercise load. In addition it was confirmed that this phenomenon was more prominent at 0°C than at 10°C when compared to 20°C.
PURPOSE This study sought to explore elementary school (ES) teachers' avoidance of teaching model-based instruction (MBI) in physical education (PE) lessons. METHODS An open-ended questionnaire (n=93) and three focus group interviews (FGI ) were conducted with seven ES teachers. The collected data were analyzed using grounded theory analysis procedures (Strauss & Corbin, 1997). RESULTS Accordingly, we derived a grounded theory paradigm model composed of the core phenomenon (ES teacher’s avoidance of MBI in PE lessons), causal conditions (traditional difficulties of Elementary PE lessons, mismatch between MBI and ES teachers/PE lessons, lack of experience and teacher knowledge for/in MBI), contextual conditions (complex instructor organization, powerful trend of play), intervening conditions (value orientation for fun-focused PE, misunderstanding about PE curriculum), interactive strategies (focus on screening physical activities, preparing for PE lessons with YouTube rather than teacher guide book), and results (learner inclusive effects and de-curricularization). CONCLUSIONS ES teachers’ avoidance of MBI in PE lessons is a result of several reported problems with elementary PE lessons and is likely to be a recurring problem in the future. To encourage ES teachers’ MBI in PE lessons, efforts should be made to build practical knowledge of model use in pre- and in-service teacher education.
This study was to explore the factors influencing Olympic performance positively and negatively. In order to achieve this purpose, 60 athletes, who participated in 2012 London Olympic games, responded on open-ended questionnaire. In addition, 10 athletes, who won medals in London Olympic, responded on in-depth interview. Collected data were analyzed by deductive content analysis. The results of this study were as follows: firstly, the factors influencing Olympic performance positively were psychological preparation, strengthening training, physical conditioning, support from significant others, material support, cheering of Korean people, self respect as a Korean national athlete, different game environment, team cohesion, sharing Olympic experience, and support of sports science. Secondly, the factors influencing Olympic performance negatively were psychological pressure, excessive expectation, negative interpersonal relationship, condition decline, overtraining, unstable environment, insufficient facilitation, decrease in performance level, and especially ineffective village room placement and media management during Olympic period. Thirdly, the differences between Olympic games and other world competitions , perceived by athletes were competition scale, psychological attitude, training support, systematic preparation, and benefits from winning medals. The results of this study will give fundamental information in developing a scale which can measure Olympic preparation level and in developing Olympic preparation guideline. Therefore, it will help athletes ,who participate Olympic for the first time or athletes who did not perform well in pre-participated Olympic games, to understand and apply in training the factors influencing Olympic performance and help them to perform better in Olympic games.
The purpose of this study was to investigate the effect of wearing of safeguard devices on various blood ions (i.e., Na+, K+, Ca2+) concentrations, gas parameters (PO2, PCO2, hematocrit [Hct], hemoglobin [Hb], Saturated [Sat] O2), and energy substrates (i.e., glucose, free fatty acid [FFA], lactate) concentrations during Kumdo training. Research scope extended to examine the heart rate changes during each exercise sessions. In order to achieve the research goal, 10 male elite Kumdo players, who play for G city in Gyeongsangbuk-do, were participated, and their mean maximum oxygen uptake level was 51.2(±6.1)mL· kg-1min-1. All subjects undertook Kumdo training sessions twice, which carefully pre-planned and consisted of routinely carrying out exercise program. Training period for each session was 80 min long including 10 min each for warm-up and warm-down period, but the conditions with wearing body protection devices were different following either with wearing complete set of safeguard devices or without wearing any safeguard devices except general training cloth. Heart rate was measured by every minute interval. K+ and Ca2+ showed interaction effect between the conditions with wearing safeguard devices and conditions with time of Kumdo training. Hct and Hb level significantly increased after 60 min Kumdo exercise regardless of wearing safeguard devices. Kumdo training induced dropping of blood pH independently with wearing safeguard device conditions, however the values and/or concentrations of PO2, Na+, glucose, lactate, Sat O2were significantly increased. Heart rate was maintained marginally higher values throughout exercise period when safeguard devices were worn. Based on these results, it was concluded that wearing the safeguard devices could possibly be causing a physiological metabolic changes, and this may be drawn by increased body fluid loss and energy expenditure. Further study should be undertaken to examine the effects of wearing safeguard devices on hitting intensity and hormone secretion and concentrations, that closely associated with body fluid and ion balance during Kumdo exercise and/or training.
PURPOSE This study aimed to develop and implement a customized mental plan program to facilitate an optimal psychological state and peak performance among para shooting athletes. It also sought to empirically verify this program’s psychological effects by focusing on improvements in concentration, confidence, and relaxation. METHODS A total of six para shooting athletes who had earned medals in the Paralympic Games underwent six program sessions that were designed and implemented based on attention-related psychological factors identified through open-ended surveys and in-depth interviews. RESULTS The athletes’ attention was facilitated by task-focused behavior, breathing control, performance routines, and physical condition management. Meanwhile, their concentration was hindered by task-irrelevant thoughts, negative physical states, and external distractions. These factors were further categorized according to competition phase: the day before, precompetition, and during competition. Based on the statistical analysis, significant improvements were observed in the athletes’ concentration, confidence, and relaxation. CONCLUSIONS The custom program was practically effective as an intervention for psychological skills tailored to experienced para shooting athletes’ individual needs. The findings offer valuable insights for developing strategies supporting the psychological states of athletes in disabled sports.
PURPOSE Players’ nonverbal behavior during a game may be expressed through selfregulatory and intentional processes, where nonverbal cues are strategically used to achieve specific outcomes. This study aimed to observe and explore the strategic and intentional nonverbal behaviors utilized by table tennis players. METHODS The study utilized a grounded theory methodology and involved purposeful sampling of ten adult table tennis players. Semi-structured face-to-face interviews were conducted. The collected data were analyzed using open, axial, and selective coding techniques. RESULTS The findings revealed that players’ intentional nonverbal behaviors are influenced by their confidence levels, physical condition, and perceptions of others’ nonverbal cues. Throughout this process, players underwent various emotional experiences, worked to maintain a positive mental state, and experienced changes in both their behaviors and psychological states, which impacted the flow of the game. CONCLUSIONS This study’s results provide valuable insights into the role of intentional nonverbal behaviors utilized by athletes during competitions. This suggests that understanding and incorporating intentional nonverbal behavior should be a key consideration in sports psychology counseling and psychological skills training.
PURPOSE This study analyzed the effect of dynamic lumbar kyphosis on the biomechnical factors affecting the lumbar joints during deep squats. METHODS Thirty adults in their 20s who had experienced weight training for more than one year participated in this study (age: 23.4±3.5years old, height: 175.3±4.3cm, weight: 75.8±6.5kg, squat single repetition maximum (1RM) weight: 115.3±19.5kg). Under both restricted dynamic lumbar kyphosis (RDLK) and dynamic lumbar kyphosis (DLK), subjects completed one repetition of deep squats at a load of 70% of their 1-RM weight. To verify the consistency of deep squat movements performed under DLK and RDLK conditions, intra-rater reliability was analyzed using intra-class correlation . The biomechnical variables of the lumbar joint were calculated during DLK and RDLK deep squats. Paired sample t-tests (IBM SPSS 27.0, Armonk, New York, USA) were used for statistical verification. RESULTS During the deep squat movement performed in DLK and RDLK conditions, the peak angles of the ankle, knee, and hip joints, the minimum height of the pelvis, and the time and tempo showed statistically high reliability, confirming the accuracy of the movement. The peak flexion angle and moment, left flexion moment, left rotation moment, and compression force factors of the lumbar joint during deep squat were significantly lower in RDLK than in DLK. CONCLUSIONS Restricting lumbar dynamic kyphosis during deep squats is essential for decreasing the risk of lumbar joint injury.
PURPOSE This study aimed (1) to analyze the behavioral intention and use behavior among the consumers of online home training contents via YouTube by employing the unified theory of acceptance and use of technology (UTAUT); (2) to test the moderating effects of risk perception toward the coronavirus (COVID-19) infection, and 3) to test differential impacts of generational difference across millennial and baby boom generations. METHODS A total of 400 questionnaires were distributed, and 383 samples were used for the final analysis after excluding 17 incomplete responses. Data were analyzed using the SPSS 25.0 and AMOS 22.0. RESULTS It was found that (1) the performance expectancy, the effort expectancy, and the social influence had positive effects on behavioral intention; (2)the facilitating condition had negative effects on the use behavior; (3) the behavioral intention had positive impact on the use behavior. Moreover, the risk perception toward the COVID-19 infection did not have moderating impacts on the UTAUT model, whereas generational differences did. CONCLUSIONS Our results suggest that the marketing strategy that improves exercise performance, convenience, and social influencing factors may be key to home training customers' behavioral intention and use behavior. Furthermore, home training material makers should recognize that the features and infrastructure required for the two generations are distinct and develop a separate marketing strategy for each.
PURPOSE The purpose of this study was to verify the support effect of muscle activity and stability according to walking conditions (Level, Ramp, and Stair) before and after wearing a suit with a 12kg heavy weight load. METHODS To accomplish the purpose of the study, subjects (n=10) underwent Electromyography (EMG) measurement under the same conditions for 10 different muscles, and COP width was calculated through foot pressure measurement. The experimental movement was level walking, Ramp walking, and stair walking, each carrying a 12kg load, and measured once before and after wearing a wearable suit. RESULTS Electrolyography (EMG) measurement revealed a significant difference in the average EMG values of muscle activity of R.RF in level walking(p<.05), R.RF and L.RF in ramp walking(p<.01), L.RF and L.BF in stair walking (p<.05). COP width measurement revealed a significant difference in the reduction of COP width in all walks (level walking, ramp walking, stair) (p<.05, p<.01, p<.001). CONCLUSIONS The effects of wearing a wearable suit are as follows. First, the wearable suit has a significant effect of assisting the Rectus Femoris muscle. Second, there is a gait stability effect by wearing a wearable suit.
