ISSN : 1598-2920
PURPOSE The aim of this study was to investigate the effects of 12-week instrumental pilates exercise on isokinetic muscle function and body composition of healthy college women. METHODS Twenty-four college women (aged 21.6±1.3yrs) were recruited to the study. The participants were divided into two groups, as the instrumental pilates group (IPG, n=12) and the control group (CG, n=12). The springboard pilates exercise was conducted 3 times a week for 40~60 minutes during 12 weeks. RESULTS There was significant interaction effects in the right knee and left · right elbow extensor muscles (60°/sec) and left knee flexor and right elbow extensor · flexor muscles (180°/sec)(p<.05, p<.01). There was no significant interaction effects in the muscle mass of the total body, trunk, arms, and legs (NS) and also in the serum growth hormone, insulin-like growth factor-I and 25(OH)Vitamin D (NS). Serum creatine kinase was significantly increased (p<.05). There was also no significant interaction effects in weight, body fat, serum total cholesterol, triglycerides, low & high-density lipoprotein cholesterol (NS). CONCLUSIONS These results suggest that although prolonged instrumental pilates exercise of healthy college women might be improving isokinetic muscle function, there is no increasing effect of muscle mass.
PURPOSE The purpose of this study was to examine the effect of visual color perception on autonomic nervous activity and exercise capacity in healthy male college students. METHODS The subjects who were healthy male college student (n=10) were participated in 4 visual colors using by randomized crossover; clear color group (CG), red color group (RG), blue color group (BG) and green color group (GG). All subjects wore goggles for five minutes prior to the exercise to adjust to color, and they did not take off goggles until recovery after exercise. Significant differences between groups were determined by two-way repeated measures ANOVA. RESULTS As a result of this study, the low frequency (LF) was significantly higher in RG than those in GG. But the high frequency (HF) was significant higher in BG compared to GG. Exercise capacity such as maximum strength, muscle endurance, reaction time, power, agility and aerobic performance did not differ significantly between all groups. CONCLUSIONS Therefore, our findings suggested that perception of the visual color might be change autonomic nervous activity, while don’t influence exercise capacity.
PURPOSE The purpose of this study was to investigate the applicability of proprioceptive-dependent training as an effective physical training method by analyzing the effects of proprioceptive-dependent training on the accuracy of perceived and actual distance as well as the correlation between the changes in the two variables. METHODS Thirty-six male college students took part in the experiment. Participants were beginners with no previous experience in golf or less than five times of experience. They were randomly assigned to one of three groups; proprioceptive-dependent training, visual-dependent training, and control, maintaining the same sample size per group. The experiment was carried out in the order of pre-test, practice section, and post-test. In the pre-test, putting was tested to assess the accuracy of perceptual and actual distance in the 1-15m distance in a random order using a digital putting analyzer. In the practice section, proprioceptive-dependent and visual-dependent training groups practiced a total of 90 putting, six times per distance with the eyes closed or open. The post-test was the same as the pre-test. The accuracy of perceived and actual distance and the correlation between the changes in the two variables were analyzed using the calculated absolute errors. RESULTS The results of this study showed that there was no difference between groups in pre-test. In contrast, in post-test, the absolute error was significantly decreased in the order of proprioceptive-dependent training, visual-dependent training, and control group in the three distance conditions. Besides, for the proprioceptive-dependent training group and visual-dependent training group, there was a significant positive correlation between the changes in the accuracy of perceived and actual distance. CONCLUSIONS These results provide insight into the applicability of proprioceptive-dependent training for enhancing motor performance by showing the effects of proprioceptive-dependent training on perceived distance, actual distance, and the correlation between the two variables.
PURPOSE This study aimed to identify the nature of human rights violations experienced by semi-professional athletes in semi-professional sports teams and explored the relevant cases. METHODS For this purpose, 35 semi-professional athletes (20 men and 15 women) from the semi-professional sports teams participated in the study, and data collection was conducted through in-depth interviews and focus group interviews (FGI). The collected data were analyzed using the phenomenological research method proposed by Colaizzi (1978). RESULTS The study summarized the results into five categories, 14 theme clusters and 41 themes. Its inherent structures include ‘first step to becoming a semi-professional athlete: disadvantageous contracts for players,’ ‘unavoidable absolute power: obedience to the coach,’ ‘forced training camp: autonomy and privacy infringement,’ ‘structural problems of the semi-professional sports federation: tyrannized power’ and ‘female players who are in male-oriented society: gender-focused than performance.’ CONCLUSIONS The results of this study provided an understanding of athletes’ human rights violations experienced in semi-professional sports teams. Understanding athletes in semi-professional sports teams through phenomenological research was conducted based on previous studies discussing practical and policy intervention measures.
PURPOSE The purpose of this study was to investigate the effects of perceived organizational support of high school football players on innovative performance. Of particular note, we focused on examining the mediation effect of self-management between perceived organizational support and innovative performance. METHODS A total of surveys returned was 137 and the data used for the final analysis was 130. The data was processed using SPSS 21.0 statistical program and Lisrel 9.2 for confirmatory factor analysis. RESULTS The results of the analysis were as follows: first, perceived organizational support of high school football players had a positive effect on players’ self-management. Second, players’ self-management had a positive effect on players’ innovative performance. Third, players’ self-management fully mediated between perceived organizational support and players’ innovative performance. CONCLUSIONS The study concluded that maximizing both perceived organizational support and self-management of the high school football players are necessary in order for the organization to achieve high level of innovative performance.
PURPOSE The purpose of this study is to find the best model to predict the demand of visitors in Let’s Run Park by using machine learning and to provide effective data for establishing future marketing strategies. METHODS For this purpose, three methods of machine learning were applied: random forest, adaboost, and gradient boosting. The variables for predicting the audience were weather data and the number of visitors per date for four years as training data, and the accuracy was predicted by comparing the actual data for one year. RESULTS First, the performance evaluation using random forest was conducted, RMSE =1856.067, R2= .965, and error was 6.47%. Second, the performance evaluation using Adaboost was conducted, RMSE =1836.227, R2= .965, and error was 5.25%, which was the lowest among the three machine learnings. Third, the performance evaluation using gradient boosting showed that RMSE =1797.400 and R2= .967 were the most accurate among the three machine learnings and error was 6.99%. CONCLUSIONS As a result of this study, each of the three machine learning features existed, but the most efficient model was gradient boosting. In addition, the best way to utilize it in the field is to predict the number of visitors by comprehensively judging the results of the three machine learning, and it is judged that it will help efficient management decision making in the future.
PURPOSE The purpose of this study was to develop the estimating equations for 4 types of Wingate Anaerobic test setting. METHODS 80 male elite athletes performed 4 trials of the Wingate Anaerobic test by each type. Subjects were conducted the retest one week later. Data collected from the Wingate Anaerobic test included mean power, peak power, and power drop for 30s were measured. Coefficient of correlation was used for validity of type 1(DOS version) and the other types(ver. 2.24, 3.3.0, and 3.2.1). Pearson’s correlation coefficient was used to examine the reliability of test and retest. Simple regression analysis was used for calculating the estimating equation. RESULTS There was significant correlation for absolute value(Watt, p<.01) and relative value(Watt/kg, p<.01) of mean power, absolute value(W, p<.01), relative value(Watt/kg, p<.05), and power drop rate(%, p<.01). Test and retest reliability was excellent for all test variables(p<.01). CONCLUSIONS From the all results, the estimating equation was calculated to convert all outputs from each type to the other types of the Wingate Anaerobic test setting. These findings suggest that the estimating equations are compatiable to 4 types of Wingate Anaerobic test setting.
PURPOSE The purpose of this study was to verify the mediated effect between self-presentation, stress coping, and competitive state anxiety among domestic elite athletes and to identify the intermediate effects of stress coping in the relationship between self-presentation and competitive state anxiety. METHODS The study was conducted with 259 elite athletes. The relationship between self-presentation, stress coping and competitive state anxiety was verified using the SPSS and AMOS. RESULTS The results of this study were as follows. First, Self-presentation affected positively on stress coping. Second, Stress coping affected positively on competitive state anxiety. Third, Self-presentation affected positively on competitive state. Lastly, stress coping mediated significantly the relationship between self-presentation and competitive state anxiety. CONCLUSIONS The result of this study shows that the competitive anxiety of elite athletes depends on the meaning of self-presentation, and the stress coping is deeply related to competitive state anxiety. In conclusion, it was determined that it provided basic data to understand the competitive state anxiety of players in various ways.
PURPOSE The purpose of this study is to examine the goalkeeper’s area of defense and how the range varies depending on the relative position of the goal, goalkeeper, and ball in a 9-meter jump shot during handball matches. METHODS Data was collected from seven qualifying divisions in mens handball from the 99th National Sports Festival in Korea. A total of 231, 9-meter jump shots were analyzed with the goalkeeper‘s area of defense measured from the point the ball left the shooter’s hand and calculated based on the relative position of the goal, goalkeeper, and ball. Video analysis was conducted using the Kwon3D 3.01 program and three-dimensional coordinates calculated using the DLT method. RESULTS First, dimension of handball goals measure 3m wide and 2m high, however, results show that goalkeeper’s actual area of defense was narrower than the width of the goal posts, while vertically, area exceeded the height of the cross bar. Second, if the goalkeeper defended the striker’s shot from the side rather than from the front, the goalkeeper’s defense range was higher for the opposite side of the goal post than the near side of the goal post. CONCLUSIONS Key factors influencing goalkeeper’s area of defense include height of shot and position of goalkeeper. Results also indicate that vertical movements are more important than horizontal movements for goalkeepers in handball thus such implementation in training may lead to performance enhancement.
PURPOSE This study aims to help improve performance by comparing and analyzing the kinematic variables for each upper and lower extremities segment when two groups of players attack the national women’s fencing players in a match situation. METHODS This study divided the movement time, movement time ratio, Fente step length change, angle factor at each event, and velocity factor of the fencing point of a sword at each event into the Olympic medalists’ group (Group A) and the international competition winners group (Group B) during the fencing Marche Fente. An independent t-test was performed for each factor, and the results were compared. RESULTS As a result, the difference between the two groups in movement time was statistically significant in the front of the foot in the velocity factor. However, no statistical significance was found between the two groups in the front angle of the trunk, the elbow angle, and the knee angle. CONCLUSIONS This indicates that group A and group B are both outstanding players with the best performance, so they are similar in the details of the movements except for the very slight difference in time and velocity. Therefore, the average of the result values of the joint angle will be a feedback index for fencing beginners or education subjects who are now starting to fencing.
