ISSN : 1598-2920
PURPOSE This study aimed to analyze the moderating effect of physical fitness on the relationship between abdominal obesity and metabolic syndrome (MetS) in older women. METHODS A total of 190 participants were categorized based on waisthip ratio (WHR) into high (50%) and low (50%) groups, as well as based on Z-score of fitness into high (25%; high fit), moderate (50%; moderate fit), and low (25%; low fit) groups. Logistic regression was used to assess the relative risk of MetS based on abdominal obesity and fitness levels, and moderation analysis using the Process macro was conducted to explore the moderating effect of fitness on the relationship between abdominal obesity and MetS risk factors. RESULTS After adjusting forcovariates, logistic regression showed that high WHR (odds ratio (OR)=2.721, p=0.004) led to a significantly higher risk of MetS compared with low WHR; the high fit group (OR=0.360, p=0.044) had a significantly lower risk of MetS compared wih the low fit group. Moderation analysis revealed that the impact of abdominal obesity on MetS risk factors varied depending on the level of fitness (β=-0.495, p=0.037), and the results remained significant after covariate adjustment (β=-0.458, p=0.049). CONCLUSIONS This study suggests that the risk of MetS from abdominal obesity can be mitigated by higher levels of physical fitness. These findings highlight the need for participation in regular physical activity to maintain a high level of fitness, along with proper nutritional intake, to prevent MetS in older women.
PURPOSE This study aimed to develop physique and basic physical fitness evaluation criteria for middle school soccer players, providing a foundation for training and player development to be used by coaches in the field. METHODS The study involved 440 middle school soccer players (Grade 1=178, Grade 2=132, and Grade 3=130). Measurements were conducted on seven physique and ten basic physical fitness factors. Measurement results were organized using Windows Excel 2021 and descriptive statistics were performed using Windows SPSS 26.0. Based on the descriptive statistics of the measurement results, the Cajori 5-Grade evaluation method was applied to establish evaluation criteria for each grade and fitness component. RESULTS The study results provide evaluation criteria for middle school soccer players based on the measured data, considering grade, physique, and basic physical fitness. CONCLUSIONS The criteria established in this study are expected to be widely utilized by coaches in the field to set training goals for areas such as player selection, development, injury prevention, and rehabilitation.
PURPOSE This study aimed to investigate the occurrence of sports injuries among badminton national team candidates during training camps and to identify appropriate measures for players to effectively manage and respond to such injuries in the future. METHODS The participants consisted of 123 individuals who took part in national team candidate training camps for badminton in 2022 and 2023. Record sheets were utilized to document the athletes' thoughts and opinions related to exercise injuries during the training period. RESULTS Badminton national team candidates experienced exercise-related injuries in various areas, including the ankles, thighs, knees, hips, shoulders, and back. Female players had a higher incidence of lower body injuries compared to their male counterparts. Through interviews with players about these injuries, individualized approaches involving appropriate rest and training adjustments were found to be necessary; additionally, educating the players about rehabilitation strategies for exercise injuries is essential. CONCLUSIONS When conducting recreational training activities, it is important to avoid fostering excessive competitive attitudes. Additionally, if potential risks are present within the exercise environment, it is crucial to assess and address these with the utmost caution.
PURPOSE This study aimed to identify the factors affecting job stress in fitness instructors, and to elucidate the mediating effects of mindset on the relationship between self-reflection and job stress. METHODS Using convenience sampling, a survey was conducted with 217 male and female fitness instructors nationwide. Statistical analyses were performed using SPSS 25.0 for descriptive statistics, frequency analysis, and reliability analysis, and AMOS 22.0 for confirmatory factor analysis to validate the measurement tools. SPSS PROCESS Macro v4.0 (Model 4) was utilized to verify the mediating effects of the research model. RESULTS Self-reflection among fitness instructors was found to significantly reduce job stress. A growth mindset was found to have a partial mediating effect on the relationship between self-reflection and job stress among fitness instructors, whereas a fixed mindset did not have a significant impact . CONCLUSIONS The results confirm that self-reflection and having a growth mindset significantly influence the reduction of job stress in fitness instructors.
PURPOSE This study investigated the differences in plantar pressure distribution when using three breathing techniques during heel raises. METHODS The subjects were 29 professional dancers aged 20 to 30 years with more than 10 years of experience. Pressure distribution according to breathing method during heel raise was measured for 10 seconds while controlling the raise speed and gaze. The three breathing techniques were randomly ordered. Peak pressure, contact area and time, displacement, and absolute velocity of the center of pressure trajectory were measured using Emed®-le from Novel GMBH. Plantar pressure was analyzed by dividing it into a total of 12 areas (masks): five toes, five metatarsals, the midfoot, and the hindfoot. RESULTS Using the teeth occlusion breathing technique, the peak pressure on the first metatarsal was significantly reduced, the contact time of the second metatarsal was significantly longer, and the displacement of the center of pressure trajectory was significantly shorter. Additionally, during the phase of the forefoot retainer, the velocity of the center of pressure trajectory was significantly reduced. CONCLUSIONS The teeth occlusion technique reduces peak pressure, increases contact time and area, and decreases the displacement and velocity of the center of pressure trajectory, demonstrating an efficient method for maintaining balance in ballet movements. This technique can potentially enhance stability and prevent injuries in ballet dancers.
PURPOSE This study aimed to identify the factors influencing the success of the sports entertainment program “A Clean Sweep” using big data analysis. METHODS Text mining, sentiment analysis, TF-IDF, connection centrality, and semantic network analysis were conducted using the social big data analysis program Textom and social network analysis program Ucinet6. The research period was limited from June 6, 2022 to November 30, 2023. RESULTS The factors determining success were entertainment programs, Monday, OTT, and independent league. The events and marketing factors were extracted, and A Clean Sweep X Kelly, A Clean Sweep X Mom love, cheering song, uniforms, and direct viewing day influenced success. The new hire factors were rookie draft, Young-Mook Hwang, Sung-Joon Won, and Hyun-Soo Jeong. Positive (such as good, fun, looking forward to, best, and funny) and negative (such as esoteric, regrettable, shocking, dislike, and uncomfortable) emotional factors were also extracted. The extracted star marketing factors were directors (Seung-Yup Lee, Sung-Geun Kim) and players (Dae-Ho Lee, Geun-Woo Jung, Hee-Kwan Yoo, Moon-Ho Kim, Yong-Taek Park, Taek-Geun Lee). CONCLUSIONS We were able to identify the success factors of “A Clean Sweep”, which we hope will contribute to the revitalization of professional baseball as well as sports entertainment programs.
PURPOSE The purpose of this study is to explore the effects of the student-athlete and student peer mentoring program as a collegiate class. METHODS The peer mentoring program, conducted at A University in the first semester of the 2023 school year, was evaluated using practical action research (Zuber-Skeritt, 1996). RESULTS In the introduction stage, ‘relative and absolute evaluation’, ‘member ratio’, and ‘definition of professor role’ were categorized as challenge issues. In the progress stage, ‘de-formalized lecture method’, ‘student athlete’s coaching experience’, and ‘student’s experience of football culture’ were discovered as possibilities, while ‘vacancy and absence of mentor-mentee’, ‘limited group activities and limitations of team sports’, and ‘lack of objective evaluation’ required improvement. At the end stage, student-athletes experienced changes in values such as self-identity, football, and human relationships, as well as quantitative and qualitative changes in sports participation. CONCLUSIONS This study confirmed the potential of the peer mentoring program as a collegiate class as well as its practical significance for guaranteeing student-athletes' learning rights and for forming sports culture on collegiate campuses.
PURPOSE This study aimed to investigate conditioning management and perception in Korea Ladies Professional Golf Association golfers and elite amateur female golfers. METHODS Physical characteristics and performance-related factors were investigated through a short version of the conditioning questionnaire consisting of 16 questions on five factors, surveying 129 female professional golfers and 174 elite amateur female golfers. The components of the questionnaire included physical fitness (four questions), injury (four questions), nutrition (three questions), mental (three questions), and performance strategy factors (two questions). Data were analyzed using IBM SPSS Statistics ver. 23.0 (IBM Co., Armonk, NY, USA). An independent t-test was used for comparison between groups. RESULTS Physical fitness-related factors showed significant differences in all four questions between groups (p<0.001–0.031), injury-related questions showed significant differences between groups in three questions (p<0.001–0.003), and one nutrition-related question was different between groups (p<0.001). CONCLUSIONS Differences were seen in conditioning management factors recognized between professional and elite amateur female athletes. Future research on conditioning questions and differences in effects according to actual performance will be needed.
PURPOSE This study aimed to analyze the differences in ground reaction forces (GRF) and pelvis and trunk kinematic patterns between groups based on ball speed during pitching. METHODS Twenty-nine males were recruited for this study. Participants were categorized based on ball speed into high (HG), medium (MG), and low (LG) ball speed groups. Statistical analysis was performed using one-dimensional statistical parametric mapping (SPM1D) one-way analysis of variance to compare GRF and pelvis and trunk kinematic patterns, followed by Bonferroni post-hoc tests. RESULTS Drive leg anterior and resultant GRF were greater in the HG than in the LG (p<0.001). The posterior GRF of the stride leg in the HG was greater than in the LG (p<0.008). Additionally, the vertical GRF of the stride leg was greater in the HG than in the LG (p<0.003), as was the resultant GRF of the stride leg (p<0.003). CONCLUSIONS The GRF of the drive and stride legs was significantly related to ball speed, indicating that a pitching strategy to maximize the GRF of the drive and stride legs is required.
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 to identify ACTN3 gene polymorphisms amongprofessional ssireum players by weight class and between elite and non-elite players,and to select genotype that matches the characteristics of the sport. METHODS The subjects of this study were 148 male athletes currently working as professionalssireum players. Chi-square test cross-tabulation analysis was conducted to examinethe differences in ACTN3 genotypes between weight classes and between elite andnon-elite players. RESULTS There were no significant differences in allele or genotypebetween ssireum players, but there were significant differences in R-allele and XXgenotype. CONCLUSIONS Players with the R-allele type of the ACTN3 gene weremore often classified as elite. Using this marker as a basis for organizing a playerselection and training programs would be more effective in training those that matchthe characteristics of elite players of the game.
PURPOSE Recently, the need to improve service quality to provide an ideal viewing experience for sport OTT service users has increased. This study aimed to analyze user reviews of the SPOTV Now app, an OTT service specializing in sports in South Korea, to identify major perceptions of viewers and suggest measures for improvement. METHODS Review data (8,512) recorded on the SPOTV Now app were collected from November 21, 2017 to November 30, 2023. LDA-based topic modeling analysis was conducted along with a series of data preprocessing processes. Sentiment analysis was carried out through machine learning logistic regression analysis and odds ratio scores were calculated. RESULTS A total of five topics were derived, including ‘member management service', 'service stability', 'sport streaming service', 'sport video service', and 'subscription service'. Sentiment analysis indicated that 'exclusive', 'server', 'payment', 'log-in', 'authentication', 'pay', 'subscription', 'advertisement', 'play', and 'loading' were the top ten keywords. CONCLUSIONS Sport OTT operators should be more responsive to user requests and feedback, and video playback and server error problems should be improved for service stability. It is necessary to secure diversity as well as exclusivity of content, in addition to minimizing advertising or preparing various rate types, so that app users feel that they receive high value for their money.
PURPOSE This study aimed to verify the relationship between adolescent athletes’ julsil, competitive trait anxiety, and self-management. METHODS A total of 370 adolescent athletes who were registered with the Korean Sport & Olympic Committee participated in the survey; 24 insincere responses were excluded from the analysis, leaving a total of 346 participants. After verifying the construct validity of the measurement tool used in the survey, statistical and correlation analyses were performed. The research model was subsequently verified using structural equation modeling. RESULTS Adolescent athletes’ julsil had a significant positive effect on self-management but not on competitive trait anxiety. In addition, self-management was found to have a significant negative effect on competitive trait anxiety, and also completely mediated the relationship between julsil and competitive trait anxiety. CONCLUSIONS Adolescent athletes’ julsil does not increase competitive trait anxiety, but rather plays a role in reducing it by increasing self-management. These findings unveil mechanisms through which julsil can be used to enhance athlete performance.
PURPOSE This study analyzed the difference in lower extremity joint angle and shock absorption patterns at the point of maximum ground reaction force during single-leg drop landing with or without anterior cruciate ligament reconstruction (ACLR). METHODS Forty adult males were recruited for this study, with 19 in the ACLR group (age: 20.52±1.43years, height: 179.26±5.18cm, weight: 74.91±6.29kg) and 21 in the control group (age: 21.42±1.61years, height: 174.97±6.83cm, weight: 69.27±7.56kg). Participants performed single-leg landings on a 30cm tall box. An independent sample t-test was used to analyze the difference in kinetics variables at the point of maximum ground reaction force upon landing, with significance set at p=0.05. RESULTS The lower limb joint angle showed significant differences in hip flexion, hip abduction, knee flexion, and knee valgus (p<0.05) between groups. There was no significant difference between the groups in terms of the results of kinetics variables during single-leg landing (maximum ground reaction force, lower extremity stiffness, and shock absorption time). CONCLUSIONS The ACLR group showed a clear difference in kinematics compared to the control group, but no significant difference in kinetic results was found. The two groups compensated for the same impact with different movements, though movements in the ACLR group may increase the risk of ACL re-injury. Those with ACLR should strive to reduce the risk of re-injury by training to use correct movements.
PURPOSE This study aimed to present the measures necessary to perform well in tennis clubs by examining the adaptation process of the MZ generation participating in tennis clubs. METHODS A qualitative case study was performed and data was collected through in-depth interviews, direct observations, and literature surveys. The data were analyzed by applying pattern matching among the analysis methods proposed by Yin (2014), and the reliability and validity of the study were demonstrated by consultations between colleagues, reviewing members, and comparing and analyzing previous studies. The study participants were seven MZ generation tennis club participants selected through snowball sampling (one of the non-probability samples). RESULTS Achieving a level of skill that allows for compatibility and the effort required for it, the acceptance of differences in club culture and between generations, having the etiquette necessary for Generation MZ, and falling for the charm of tennis itself were identified as factors for successful participation in tennis clubs. CONCLUSIONS This study is expected to help the MZ generation, who have recently been interested in tennis, continue their participation, as well as lay a small foundation for the expansion of the base of the sport by detailing the measures necessary to successfully participate in tennis clubs.
PURPOSE This study aimed to explore ways to utilize augmented reality (AR) in school sports and leisure by examining the case of an elementary school sports club using augmented reality-based e-sports. METHODS A self-study approach and Eisner's(1995) educational criticism were utilized. Data including photos, videos, literature, and memory boxes related to the elementary school AR sports club were collected weekly during the school semesters from March 2023 to January 2024, spanning a total of 30 weeks. The data were analyzed following the stages of analysis by Elo & Kyngäs(2007). RESULTS Augmented reality can act as a personalized exercise coach by visualizing physical activity information. Through posture and movement analysis, education on physical strength and expression can be provided that is linked to home; it can also expand the range of sports experiences and create a new sports culture. In order to effectively utilize AR, edtech field experts must be trained, and content must be developed through cooperation between companies and schools. The educational effectiveness of the content must be verified and the management system must be inspected, and public facilities utilizing edtech must be expanded. CONCLUSIONS AR has endless development potential in school sports and leisure, but these will require active interest and support from educational authorities.
PURPOSE This study aimed to verify the differences in anticipated regret and gambling discontinuance intent based on the fear appeal type and source similarity in different types of horse-racing gamblers. METHODS Using convenience sampling, 172 responses were collected from horse-racing participants who bought horseracing tickets within the last 6 months. After eliminating 30 insincere responses, descriptive, correlation, reliability, and two-way multivariate covariance analyses were conducted using SPSS Ver. 26.0. RESULTS Anticipated regret and discontinuance intent were higher under fear appeal using social compared with financial risk. Compared to recreational gamblers, problem gamblers had higher anticipated regret and discontinuance intent under fear appeal using social compared with financial risk. There were no differential impacts of source similarity on anticipated regret and discontinuance intent in both types of gambler. CONCLUSIONS Practitioners in charge of conducting messaging campaign to prevent addiction to horse-racing gambling may cause problem gamblers to expect regret and quit gambling by delivering preventive messages with relatively unfamiliar risks such as social risks, rather than familiar risks such as financial ones.
PURPOSE This study aimed to explore the structural relationships between technology-related factors and the intention to use baseball data, drawing upon the Unified Theory of Acceptance and Use of Technology (UTAUT) and technology readiness (TR). METHODS Survey data from 203 Korean professional baseball players were used in frequency, reliability, correlation, and confirmatory factor analyses as well as structural equation modeling. RESULTS Positive TR positively influenced performance expectancy, effort expectancy, social influence, and conditions facilitating baseball data use. Negative TR did not significantly impact performance expectancy, effort expectancy, social influence, and conditions facilitating baseball data use. Performance expectancy, effort expectancy, and facilitating conditions were found to positively influence data use intention, while social influence did not significantly impact data use intention. CONCLUSIONS The findings suggest that increasing performance expectancy, effort expectancy, and facilitating condition factors could be key to enhancing the intention to utilize baseball data.
PURPOSE This study comprehensively examined the aerodynamic and flight characteristics of modern soccer balls, focusing on their design evolution and performance attributes. METHODS The aerodynamic characteristics of five types of World Cup balls (2006 Germany World Cup, 2010 South Africa World Cup, 2014 Brazil World Cup, 2018 Russia World Cup, 2022 Qatar World Cup) and five types of Euro tournament balls (EURO2008, EURO2012, EURO2016, EURO2020, EURO2024) were examined, along with their respective design changes. RESULTS Through detailed analysis, significant variations in aerodynamic properties among soccer balls used in various tournaments were identified. Recent advancements have resulted in faster transitions towards critical Reynolds numbers, indicating improved stability in flight trajectories. This enhancement was attributed to the augmentation of surface roughness, which plays a crucial role in enhancing aerodynamic stability and overall performance. 2D simulations simulating powerful goalkeeper kicks revealed distinct differences in flight distances among different soccer balls; the Jabulani ball used in the 2010 World Cup exhibited the longest flight distance, while that of the 2024 Euro ball was the shortest. CONCLUSIONS Variations in surface texture significantly impact aerodynamic properties, affecting flight distance, arrival time, and height. This study underscores the significant design enhancements in modern soccer balls that optimize aerodynamic stability and performance, with modifications aimed at improving flight characteristics and enriching player experience.
