[Purpose] The purpose of this study was to predict winning percentage in the Korean Basketball League(KBL) by applying the possession concept. [Methods] The model to estimate possession was utilized by formula used in NBA(National Basketball Association). Data consist of 20 seasons of the KBL (1997-2017). For data analysis, multiple regression analysis, Fisher’s Z transformation and stepwise multiple regression analysis were performed using SPSS 22.0. [Results] The result indicated that average team stats per possession had more explanatory power in predicting the KBL teams’ winning percentage than average team stats per game. The most important factor for winning in the KBL was defensive rebounds and followed by 2-point field goal percentage, steals, 3-point field goal percentage, free throw attempts, turnovers, offensive rebounds, blocked shots, free throw percentage, and assists. The results of this study provided fundamental information for the data analysis of Korean basketball games. It might be useful for basketball coaches to manage and instruct their teams. [Conclusion] Practical implications and future research direction were also suggested.
Purpose The purpose of this study is to investigate the effects of grip width and hand orientation on muscle activities of upper body during the lat pull-down. Methods Eight healthy men performed the 6 grip variations (3 grip width × 2 hand orientation) using an experimentally determined load of 70% of 1 repetition maximum. Five trials were analyzed for each grip type. Participants maintained a cadence of 2-second concentric and 2-second eccentric phases. The grip widths were normalized for each individual by using their biacromial diameter (100%), and then set the grip width 50% of biacromial diameter and 150% of biacromial diameter. Surface EMG of the latissimus dorsi, pectoralis major, infraspinatus, biceps brachii, triceps brachii, rectus abdominis, erector spinae and middle trapezius was recorded, and the root mean square of the EMG was normalized, using a maximum isometric voluntary contraction. Results Latissimus dorsi showed higher muscle activities in 100% grip width than those of 50% grip width. Pectoralis major and rectus abdominis showed higher muscle activities in 50% and 100% grip width than those of 150% grip width. Middle trapezius showed higher muscle activities in 150% grip width than those of 50% grip width. Conclusions Two-way repeated measures ANOVA for each muscle revealed that latissimus dorsi and middle trapezius (the posterior muscles of trunk) showed higher muscle activities in wide grip, on the other hand, pectoralis major and rectus abdominis (the posterior muscles of trunk) showed higher muscle activities in narrow grip.
Purpose Incidence and prevalence of Korean teenager cheerleading injuries were surveyed. Methods A total of 769 junior cheerleaders who participated in National Sport Cheerleading Competitions responded to a questionnaire, and 435 reported experiences of injuries. Results Risk factors for injury included older age (p<0.001), increased experience (p<0.001), and higher BMI (p<0.05). The most frequent injury occurred at wrist, ankle, knee, shoulder and waist. And the most responded types of injury were muscular pain and contusion. Cheerleading experience affected on injury prevalence. They were injured when they perform Elevator (<0.5 yrs), Cradle (0.5-1 yrs), Cradle and Basket toss (1-2 yrs), Cradle and Pyramid (2-3 yrs). These techniques involved in bodily movements of going up and cradle. About 56% of injury was treated at home or not treated at all, and 60% of injury was either self-treated or not intervened. And only 32% of cheerleaders practiced on a formal mattress. Conclusion Safety measures for these youth cheerleaders are necessary and guidelines for securing safety and preventing and treating injuries for these population are urgent.
Purpose The purpose of this study is to calculate the ranking of vault players in artistic gymnastics by individual and by country using the PageRank algorithm. The purpose of this study is to provide basic data that can be used in gymnastics events by comparing the performances of historical vault players with those of previous Olympic competitions. Methods The data collected for this purpose is a score of 117 vault players based on the results of the Olympic final event published in the International Gymnastics Federation (FIG). For data analysis, PegeRnak algorithm was used for calculating the ranking of vault players using MS-Excel and NetMiner. Results The results are as follows that. First, the PageRank algorithm is possible to calculate for historical vault players' rankings. Specifically, the ranking of vault players for historical Olympic calculated by PageRank ranked as Gervasio Deferr from Spain (ESP) at 1st, Alexei Nemov from Russia (RUS) at 2nd, and Klaus Koste from Germany (GDR) at 3rd. Second, Network of vault players' ranking is separated by each generation of Olympic games. Conclusions As a conclusions, it is possible to calculate national ranking of vault games of gymnastics by using PageRank algorithm.
The purpose of this study was to determine how acute active pc-video game affects kinematic variables and muscle activities of adolescents. Fourteen middle school students(age: 15.9±0.7 yrs, height: 171.3±6.1cm, weight: 60.0±5.4 kg, right handed) who have no musculoskeletal disorder were recruited as the subject according to having experience in using the pc-video game for more than six months. Maximum angle, angular velocity, and muscle activity of the upper extremity were determined for each trial. For each dependent variable, a paired t-test was performed to test if significant difference existed between pre- and post a 60 minute active pc-video game(p<.05). This study found that one hour pc-video game hour may not affect on movement and ROM of the finger and the wrist, whereas it may have an effect on muscle activity of the upper extremity. It seems that repetitive movement pattern during an active pc-video game may hinder muscle activity of adolescents’ upper extremity. Part of the increase in musculoskeletal disorders is linked to the amount of time adolescents are allowed to play video games. This study found that an active pc-video game appears to have negative effects on the upper extremity muscles. Since wrist movements are continually repeated throughout the video game, carpal tunnel syndrome may possibly be caused by long-term exposure to video games.
The purpose of this study was a investigate the endothelial function of prehypertensive during dynamic exercise. Hypothesis of this study was to impair the endothelial function in prehypertensive compared to normtensive during dynamic handgrip exercise. Eleven healthy prehypertension (24±2 yrs) and ten healthy normotensive (25 ± 2 yrs) were recruited in this study. Participants were performed dynamic handgrip exercise in one contraction per second at 30% of maximum voluntary contraction for three minutes. Vascular (blood vessel diameter, blood flow) and cardiar response (stroke volume, heart rate and cardiac output) were measured at rest and during exercise. Flow mediated dilation (FMD) was decrease significantly in prehypertensive less than normotensive (p<0.05) at rest, and vasodilation of prehypertensive was reduced significantly less than normitensive during exercise (p<0.05). All the cardiovascular responses were aot significantly different at rest and during exercise between prehypertensive and normotensive. These results suggest that endothelial function is impaired in prehypertensive compared to in normotensive
The objective of this study was to reveal the characteristics of lower extremity motions of middle-aged women in accordance with their walking speed, and also to suggest elements of improving functions of walking-shoe for the improvement of gait stability. Total 30 healthy middle-aged women were asked to walk in their preferred speed and also speed 20% faster than that. Using the 3D motion capture system and the plantar pressure measuring system, the characteristics of lower extremity motions were measured. For the analysis on differences in motions between preferred and faster speeds, the paired t-test was performed. At this time, the significance level was set up as α=.05. The walking in faster speed showed the greater ground contact angle than walking in preferred speed while its gait stability was low. Also, the faster walking showed the bigger plantar pressure, and especially, the pressure on the great toe was high. It would be necessary to improve functions of shoes for the gait stability and dispersion of pressure on feet while fast walking.
The purpose of this study was to develop and validity Competitive State Anxiety Scale for Taekwondo Form athlete(CSATF). The participants were composed of the 48 Taekwondo Form athlete to explore sub-factors of Competitive State Anxiety for Taekwondo Form athlete. The data were collected by an open-ended questionnaire and interview. The participants were composed of 257 national Taekwondo Form athlete to develop Competitive State Anxiety Scale for Taekwondo Form athlete. This 157 athlete data were used for items analysis, reliability analysis and exploratory factor analysis. And 100 athlete data were utilized for confirmatory analysis. Also convergent validity, discriminant validity, predictive validity latent mean analysis of CSATF were performed The results of this study were as follows. Firstly, the results revealed that the four general dimensions were identified such as cognitive anxiety, somatic anxiety, state of confidence, environmental anxiety. Secondly, CSATF comprised cognitive anxiety(5 item), somatic anxiety(5 item), state of confidence(5 item) and environmental anxiety(6 item). Thirdly, convergent validity, discriminant validity and predictive validity, the multi-group analysis according to gender examined validity of CSATF.
Sportscasting in Physical Education (Lee, 2011) is a class activity that students simulate sports broadcasting (e.g., students report, analyze, and comment on game play). It encourages problem solving (PS) learning for students. Scaffolding is the support with the intention of helping the student achieves his/her learning goals and contributes to problem solving. However, limited studies have examined if sportscasting with scaffolding is effective instructional strategies for PS. The purpose of this study was to examine effects of sportscasting with scaffolding on PS abilities, and on academic achievement. Participants were 46 college students. The static-group comparison design was used: an experiment group (N=26) with supportive scaffoldings (e.g., conceptual explanation, terminology dictionary, visual materials) and a control group (N=20) with reflective scaffoldings (e.g., organizing the environment, using appropriate cues to guide behaviors, and modeling). The results revealed that students in reflective scaffoldings had higher PS abilities than students in supportive scaffoldings. However, two groups were not statistically different in academic achievement. Sportscasting with instructional scaffolding promote a deeper level of cognitive skills and male students performed better than female students. The effective scaffolding types (Lewis, 2010) for sportscasting were discussed to help students to foster PS skills.
The purpose of this study was to investigate effects of carbon nanotube-based insole on the resultant joint moment and muscle activity of the lower extremity during drop landing. Ten males with no known musculoskeltal disorders were recruited as the subjects. Two digital camcorders and one force plate were used to obtain 3-D kinematics and kinetics of the lower extremity. To assess the myoelectric activities of selected muscles, five surface electrodes were attached to the right side of the lower extremity. For each dependent variable, paired t-test was performed to test if significant difference existed between with carbon nanotube-based insole(CNT) and ethylene vinyl acetate-based insole(EVA) conditions(p<.05). The results showed that average and peak IEMG values from RF, TA, MG, and LG in CNT were lower than corresponding values in EVA. Although no significant difference in resultant joint moment was found between two conditions, a decrease in the knee extension moment was found with CNT. This indicates that wearing carbon nanotube-based insole may help to decrease impact force and to control excessive flexion movement of the knee joint during landing.
