Search Word: Performance, Search Result: 282
211 비선형 주기화 근력 훈련의 적용이 국가대표 크로스컨트리 스키 선수들의 기초 및 전문체력에 미치는 영향
Bongju Sung ; Yeuigyu Im ; Kwangkyu Lee Vol.33, No.3, pp.320-329 https://doi.org/10.24985/kjss.2022.33.3.320
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Abstract

PURPOSE This study investigated the effect of non-linear periodization strength training on basic and professional fitness of national cross-country skiers. METHODS The body composition (height, weight, BMI, body fat %), basic physical strength (grip strength, lung capacity), anaerobic power (peak power, average power), graded exercise test (maximum heart rate, running time, VO2max, lactic acid), isokinetic strength (trunk strength), and 1RM (bench press, dead-lift, squat, shoulder press, leg curl, bicep curl, cable triceps extension) of nine national cross-country skiers (male: 5, female: 4) were measured. All analyses were performed using SPSS 25.0, Kruskal-Wallis H tests were applied to observe the changes by training methods. Mann-Whitney U tests were used as Post Hoc. RESULTS The results indicated that running time and VO2max post-test improved compared to that for the pre-test for graded exercise test. The lumbar extension strength of the post-test was higher than that for pre-test. There was no significant difference in other variables. CONCLUSIONS It is suggested that nonlinear periodization strength training can be expected to improve running time, VO2max, and trunk strength for cross-country athletes; however, it does not affect the overall changes.

212 그래피티 변천 과정에서 스포츠의 역할에 대한 분석
Kisung Kwon ; Jeehyun Kang Vol.33, No.3, pp.418-428 https://doi.org/10.24985/kjss.2022.33.3.418
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Abstract

PURPOSE Although sport and graffiti often collaborate in various forms and sectors, research on this phenomenon is insufficient. Therefore, this exploratory study analyzed the role of sport in line with the diffusion of graffiti in Korea. METHODS Qualitative research method was applied for data collection and analysis. Specifically, systematic literature review, semi-structured in-depth interviews, and written interviews were used for data collection. Subsequently, content analysis, categorization, and itemization were performed. RESULTS International sporting events had an impact on the diffusion process of graffiti. Additionally, graffiti was used as a promotional content for sporting events and sport brands, and specific sport content were used as the medium for street art works, including graffiti. Furthermore, graffiti was used as a promotional content for marketing activities in collaboration with a professional sports team by general corporations. CONCLUSIONS As graffiti becomes one of the major cultures from a subculture, it is expected to increase public interest in all sports and not just in specific sports through collaboration with graffiti.

213 급성 운동으로 인한 급성 근육 피로 후 Tensiomyography의 변화 경향성: 체계적 고찰 및 메타 분석
Seunghyeok Yeom ; Hyungwoo Lee ; Kyoungkyu Jeon Vol.33, No.1, pp.19-32 https://doi.org/10.24985/kjss.2022.33.1.19
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Abstract

PURPOSE The purpose of this study was to establish the criteria for measuring acute muscle fatigue using tensiomyography (TMG) by quantifying the trend of changes in TMG variables. METHODS Searches were conducted in the Web of Science and Pubmed databases using the keyword “Tensiomyography”. Sixteen studies which used TMG to measure acute muscle fatigue caused by acute exercises in rectus femoris or biceps femoris were included. All statistical data analyses were performed using Comprehensive Meta-Analysis software program. RESULTS The meta-analysis results indicated that the biceps femoris showed a significant (p<.05) decrease in all TMG variables of the elite athletes. Also, in the overall effects of maximum displacement and mean velocity until 90% Dm (Vc90) showed a significant (p<.05) decreasing trend. The rectus femoris showed a significant (p<.05) decreasing trend for maximum displacement (Dm) in the average person, while contraction time (Tc) showed a decreasing trend in elite athletes and overall. CONCLUSIONS These results suggest that TMG could be used as an indicator of muscle fatigue indicator, and will help to develop a more proper protocol to test the response of the body to muscle fatigue.

214 Accuracy Verification of 3D Motion Analysis System Using Smart-phone Monocular Camera
Jonghyun Yang ; Jeongjun Park ; Changwan Yu Vol.32, No.4, pp.464-471 https://doi.org/10.24985/kjss.2021.32.4.464
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Abstract

PURPOSE This study aimed to verify the accuracy of three-dimensional (3D) motion data produced through artificial intelligence-based user motion recognition technology with images obtained using a smartphone monocular camera. This was done to explore the possibility of developing an application that can improve the reliability of the measurement of physical activity performing motions and feedback provision. METHODS To check the accuracy of the artificial intelligence-based 3D motion analysis system that utilized a semi-supervised learning method, a commercialized 3D infrared motion analysis system measured and compared motions on three movement planes, motions with limited joint movement, and fast motions in a wide moving range. RESULTS The motions on the coronal and sagittal planes produced through the 3D motion analysis application showed very high measurement accuracy; however, the accuracy of the measurement of motions on the horizontal plane, which could not be measured directly with a camera, was relatively lower than that of the coronal and sagittal planes. Accuracy in measuring 3D motion was moderate in moving motions and low in motions with limited joint movement. CONCLUSIONS For the developed 3D motion analysis system to be used in online physical education, the types of physical activities included in the program should be comprehensively composed through the analysis of the content system of the physical education curriculum and the resultant physical activities.

215 The Development and Application of Positive Psychological Intervention Program for a College Ice Hockey Team
Jane Rhee ; Sang-Hyun Kwon ; Dong-Won Yook ; Jung-Taek Shin Vol.32, No.4, pp.613-627 https://doi.org/10.24985/kjss.2021.32.4.613
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PURPOSE This study aimed to develop a positive psychological intervention program for a college ice hockey team and test its effects based on application to the team. METHODS The demands of 78 college ice hockey players were asked through open questionnaires. Collected results underwent integrated analysis to develop the desired program through the participants who were also observers of the team. The objectives of the program were established, and an appropriate program was developed based on the analyzed data, expert opinion, and precedent research. The developed program was applied to 26 players of a college ice hockey team to verify its effects. Tasks included writing experience reports and in-depth interviews. The Happiness Measures 1, Strength Knowledge, and Team Interaction Questionnaires were also administered. Collected qualitative data were categorized to follow inductive analysis procedures, while paired t-tests were performed for quantitative data using SPSS 25.0. RESULTS To improve the application of the program in real situations and maintain credibility and validity, the program was developed based on analyses of individual and team demands, methods of the participant as an observer, expert opinion, and other considerations. Statistically meaningful differences in positive psychological mind, happiness, recognition and utilization of strengths, team interactions, team cohesion, and so on were found using paired t-tests comparing data before and after the developed positive psychological intervention program. CONCLUSIONS Providing opportunities to recognize individual and team strengths and have valuable experiences for each player could enhance interactions between teammates and create a favorable team environment.

216 Developing the Estimating Equations for Muscle Power by Analysis of Reliability and Validity on Different Versions of Wingate Anaerobic Test Setting
Bongju Sung ; Byounggoo Ko ; Kwangkyu Lee Vol.32, No.3, pp.419-428 https://doi.org/10.24985/kjss.2021.32.3.419
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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.

217 The Relationship among Emotional Leadership, Coach Trust and Athletic Satisfaction of University Soccer Players
Sunghoon Kim ; Jung Taek Shin Vol.32, No.2, pp.230-241 https://doi.org/10.24985/kjss.2021.32.2.230
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Purpose The purpose of this study was to analyze the relationship among emotional leadership, coach trust and athletic satisfaction of university. Methods 288 university soccer players were surveyed on the emotional leadership questionnaire, coach trust questionnaire and athletic satisfaction questionnaire through convenience sampling method. SPSS 23.0 and AMOS 23.0 were used to achieve the purpose of this study. Frequency analysis, confirmation factor analysis, reliability verification, correlation analysis and the structural equation model analysis were performed. Results First, emotional leadership had a positive effect on coach trust of university soccer players. Second, emotional leadership had a positive effect on athletic satisfaction of university soccer players. Third, coach trust had a positive effect on athletic satisfaction of university soccer players. Finally, coach trust mediated the relationship between emotional leadership and athletic satisfaction. Conclusions Emotional leadership was a leadership that can efficiently increase coach trust, and leaders must communicate with players through emotional effort and team operations with goals of athletic satisfaction and happiness rather than wins and losses were required.

218 Effects of white noise auditory stimulus on stability and balance in sit-to-stand and standing motion of chronic stroke patients
Hee-sung Lim ; Sang-heon Park ; Joo-Nyeon Kim Vol.31, No.3, pp.423-431 https://doi.org/10.24985/kjss.2020.31.3.423
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Purpose The purpose of this study was to investigate the effect of auditory stimulus using white noise on stability and balance during sit-to-stand and standing tasks of chronic stroke patients. Methods Eighteen chronic stroke patients participated in this study. They asked to perform the tasks of sit-to-stand, standing with eyes open and standing with eyes closed before and after listening to white noise. Eight infrared cameras and one force plate were used to evaluate the stability and balance before and after the white noise stimulus during each task. Results There was no significant difference between before and after white noise stimulus in all tasks. On the other hand, the anteroposterior range of CoP was significantly decreased after white noise stimulus in standing with eyes-closed (p<.05), and the sagittal angle of CoP-CoM was significantly decreased after white noise stimulus in standing with eyes-open and eyes-closed (p<.05). Conclusion Auditory stimulus using white noise improves the balance of chronic stroke patients. Therefore it is thought to be helpful for the independent daily life of chronic stroke patients.


219 Development of an image processing-based ball tracking program for table tennis
Je-heon Moon ; Seung-hun Lee ; Ju-sung Lee ; Panday Manish ; Gustavo Adrian Ruiz Sanchez ; Siddhartha Bikram Panday Vol.31, No.2, pp.180-188 https://doi.org/10.24985/kjss.2020.31.2.180
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Purpose The purpose of this study was to develop algorithms and software that can track the trajectory of table tennis balls using image-processing algorithms to obtain information quickly for under and establish tactics used in table tennis. Methods The algorithms used in the field of computer vision were applied on two matches played by novice and two matches during international competitions by elite athletes. Reliability analysis was performed by comparing the table tennis ball bounce frequency in each zone obtained through the automatic method and the manual method. Results The mean reliability of the two novice games was only 85.1 ± 3.69%, total error was 14.9 ± 3.69%, overestimation error was 52.2 ± 9.78%, and underestimation error was 47.8 ± 9.78%. While the mean reliability of the two international tournaments was 71.8 ± 0.87%, the total error was 28.2 ± 0.87%, overestimation error was 82.0 ± 8.03%, and underestimation error was 19.2 ± 7.75%. Conclusions Although the target reliability of algorithms and software developed in this study was achieved only in novice competitions with 80%, the over-estimation errors were generally high in international competitions, showing the potential for further improvement.


220 Effects of exercise information using social network service(SNS) on physical activity and psychological variables among inactive college students
Dojin An ; Youngho Kim ; Soojin Kang Vol.31, No.2, pp.189-201 https://doi.org/10.24985/kjss.2020.31.2.189
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Purpose The current study investigated the effects of exercise information using social network service(SNS) to identify changes of physical activity and psychological variables among inactive college students. Methods Inactive college students(30 experimental group, 30 control group) were voluntarily participated in the 12-weeks intervention. During this period, the experimental group received exercise information through SNS. And all study participants’ physical activity, stages of physical activity, self-efficacy, motivation, and perceived benefits and barriers were measured at the pre, mid and post intervention. Frequency analysis, chi-square test, 2-way ANOVA RM were conducted to analyze data obtained in the study. All procedures were performed by using SPSS 23.0. Results The exercise information intervention using SNS during 12 weeks had a positive effect on the stages of physical activity of inactive college students, and there were statistically significant differences. In addition, physical activity, perceived benefits and barriers, self-efficacy, motivation positively improved after the intervention, but there were no statistically significant differences between experimental and control group. Conclusions The present study suggests that psychological strategies using various SNS programs have positive effects for inactive college students to increase physical activity and its related psychological variables.

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