• Korean Journal of Applied Biomechanics
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• v.20 no.4
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• pp.457-467
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• 2010

This study intends to analyze the projection factors' difference on each record of women's javelin throwing. For this purpose, the research analyzed the best record and the lowest one of athletes in top 1~7 ranks respectively, who participated in 2009 Daegu Pre-Championship Meeting. For analyze kinematic factors, we analyzed their game photos mainly shot by 3 cameras installed in side places. The used analysis program was Kwon3D 3.1. Analysis variables were the projection velocity, angle, height, trunk lean angle, and supporting leg's knee angle. The results concluded as follows: Different record showed statistically significant differences(p<.05) in terms of horizontal velocity and resultant velocity. There were no statistically significant differences in the variables of projection angle, its height, trunk lean angle and knee angle of support leg. But for the analyzed results to each individual characteristics, the horizontal velocity, projection height, knee angle of support leg and trunk lean angle of release event appeared to have influence on record.

• The Korean Journal of Food & Health Convergence
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• v.6 no.2
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• pp.23-26
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• 2020

Active and therapeutic sport recovery is becoming a popular and important component in approving performance for pro and recreational athletes alike. It is also helping in the realm of injury prevention. In the search of finding modalities that are widely effective, natural, and safe, acupuncture is a viable and cost-effective treatment for helping athletes achieve this goal. More direct related research is needed, but testimonials from pro athletes and the body of research that currently exists provides powerful evidence on acupunctures ability to help with enhancing recovery. Specializing in acupuncture and exercise science, Chris integrates acupuncture into musculoskeletal rehabilitation therapy or fitness training for pain modulation, speedy recovery, and enhanced performance. Clients can choose to focus on one-on-one corrective exercise therapy, manual and massage therapy, or acupuncture. However, for best results, Chris recommends all three. Other modalities that he uses in therapy are acu-taping, herbal therapy, nutrition supplementation, cupping, guasha, and stretching techniques. The corrective exercise component is one-on-one body balancing management, focusing on strength and conditioning, post physical rehab - exercise therapy, integrative sport specific exercise, weight loss, core strengthening, dynamic lumbar stabilization, active recovery techniques, and myo-fascial release techniques. The acupuncture component focuses on sport injuries, myofascial pain, peripheral neuropathy, arthritis, facial rejuvenation, stress, smoking cessation, addiction detoxification program, weight management, sport recovery and performance.

• Journal of Sport and Applied Science
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• v.5 no.3
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• pp.7-12
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• 2021

Purpose: The purpose of this study is to examine the relationship between the perfectionism tendency of amateur boxers and exercise exhaustion, to understand the perfectionism tendency of boxers in the sports of speculative sports, and to provide startigic insights for reducing exercise exhaustion. Research design, data, and methodology: In this study, adult boxers registered with the Korean Boxing Association of the Korea Sports Council in 2019 were selected as the research population. 280 boxers participated in the survey and responded the survey items, which were constructed by research variables, perfectionism and burnout. Data were analysed using SPSS version 18.0 for statistics. In details, frequency, correlations, exploratory factor analysis, multiple regressions were conducted to test the proposed relationship. Results: As a result of analysing the relationship between amateur boxers' perfectionism and athletic exhaustion, it was con-firmed that when the self-oriented perfectionism among amateur boxers' perfectionist tendencies was high, it had a significant effect on exercise burnout. Conclusions: In order to reduce the pressure of amateur boxers to win and the pressure to pass through the weight class, which is characteristic of weight control events, if the athlete manages himself well, the athlete's exercise exhaustion will decrease. If professional mental training is combined, it is judged that amateur boxing will be able to develop once again.

• Korean Journal of Applied Biomechanics
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• v.31 no.4
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• pp.270-275
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• 2021

Objective: The purpose of this study was to evaluate 16 muscles activity according to three exercise intensity when performing Deadlift and Upright row. Method: To accomplish the purpose of the study, subjects (n=10) were performed Electromyography (EMG) measurement for 16 different muscles. The experimental movements were Deadlift and Upright row, measured five times for each intensity (40%, 60%, 80%) of 1RM. This study normalized the EMG values through RVC for comparative analysis. Results: The results were summarized as follows: As a result of Deadlift, there was significant difference in the mean EMG value according to the exercise intensity in all muscles except RA, PM and BB (p<.05). As a result of Upright row, There was significant difference in the mean EMG value according to the exercise intensity in all muscles except BF, TA, GN, RA and UT (p<.05). Conclusion: This study allowed us to know the activities of major muscles according to the exercise intensity for 16 different muscles when performing Deadlift and Upright row.

• Archives of Orthopedic and Sports Physical Therapy
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• v.14 no.2
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• pp.91-97
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• 2018

Purpose: The purpose of this study was to observe the effects of sport massage and McKenzie stretch exercise on forward head posture. To understand the effect, this study measured and analyzed body alignment of the neck. Methods: In this study, a total of 14 subjects with forward head posture were analyzed. Subjects were divided into two groups: group 1 (n=7) received a McKenzie stretch exercise and group 2 (n=7) received a McKenzie stretch exercise and a sport massage. The McKenzie stretch exercise was performed three times a week, for four weeks, while the sport massage was performed once a week. The body alignment of the neck (CVA, CRA) was measured using a goniometer. Results: The improvements in neck body alignments (CVA, CRA) after the McKenzie stretch exercise and sport massage were both significant (group 1: p<0.05; group 2: p<0.05), whereas the between-group comparison found no significant differences. Conclusions: In conclusion, our study confirmed that the McKenzie stretch exercise and sport massage had a significant positive effect on the body alignment of the neck. However, a study that included a greater number of subjects and a long-term treatment period is needed to generalize these results.

• Korean Journal of Applied Biomechanics
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• v.31 no.1
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• pp.50-58
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• 2021

Objective: This study aimed to determine the effect of wrist and trunk weight loading using sandbags in stroke patients in order to provide the quantitative data for enhancement of gait movement. Method: Twelve stroke patients, who have been diagnosed with hemiplegia over a year ago, were participated in this study. All subjects were asked to perform normal walking [N], wrist sandbag walking [W], wrist & trunk sandbag walking [WT], and both wrist sandbag walking [B] and both wrist & trunk sandbag walking [BT], respectively. Eight infrared cameras were used to collect the raw data. Gait parameters, arm swing, shoulder-pelvic kinematics, and lower extremity joint angle were calculated to examine the differences during walking. Results: As a result, there were no significant differences in the gait parameters, shoulder-pelvis, and lower extremities joint angles, but significant differences were found in the range of motion and the anteversion in arm swing. Conclusion: Wrist and trunk weight loading using sandbags affected the movement of the upper extremities only while it did not affect the movement of the lower extremities. It implies that it can reduce the risk of falling caused by a sudden movement change in lower extremities. In addition, the wrist and trunk weight loading using sandbags can induce changes in movement of the upper extremities independently and contribute to functional rehabilitation through resistance training.

• Journal of Sport and Applied Science
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• v.3 no.1
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• pp.19-25
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• 2019

Purpose: Children's swimming pools are picking up faster than the other types of swimming pool. Yet, safety law-related studies are still lack. This study is to review legal status of children's swimming pool in Korea and to discuss the related legal issues for safety management of children's swimming pool. Research design, data, and methodology: The study reviewed law and clauses for sport facility management and related legal clauses with chilren's swimming pool management, and sport facility-related articles. Results: Safety management of children's swimming pool should currently follow law for sport and physical education facility management because of no its own legal norm for children's swimming pool. Given this, specific law and clauses for children's pool management need to be legislated to prevent risks for children and to satisfy specific safety factors considering careless behavior of children. Conclusions: Regarding this, the study points out five suggestions. First, law should be established to make notification of safety rules mandatory and this notification should be placed in the pool. This notification would be better effective if it is visualized. Second, according to law, safety 7 rules of children' s swimming pool need to be legistrated and educated for pool managers to obey them. Pool managers could also add their own rules to the 7 rules. Finally, preparation of emergency kits and safety devices need to be mandatory in the pool. Further implications were discussed.

• Korean Journal of Applied Biomechanics
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• v.23 no.4
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• pp.285-294
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• 2013

The purpose of this study was to provide fundamental information for success factors of techniques through kinematic analysis including coordination of lower extremities and landing stability according to the success and failure of $540^{\circ}$ Dwihuryeochagi in Taekwondo. Twenty Taekwondo athletes: ten success group (S, age: $22.3{\pm}1.8$ yrs, height: $172.1{\pm}5.4$ cm, body mass: $64.4{\pm}4.2$ kg) and ten failure group (F, age: $22.3{\pm}1.8$ yrs, height: $172.1{\pm}5.4$ cm, body mass: $64.4{\pm}4.2$ kg) participated in this study. Three-dimensional motion analysis using a system of 3 video cameras with a sampling of 60 fields/s was performed during the competition of $540^{\circ}$ Dwihuryeochagi. Motions were divided into five events: pivot foot landing (E1), pivot foot toe off (E2), COM max height (E3), kick impact (E4) and landing (E5). At E1, the stride width was greater for S than for F (p<.05) while the time was greater for S than for F during P4 (p<.05). At E4, knee angle was greater for S than for F (p<.05). At E5, hip angle was greater for S than for F (p<.05) while kick distance was greater for S than for F (p<.05). Furthermore, at P3, the time would be related to kicking velocity (p<.05), while at P4, the time, range of hip angle and knee angle would be related to kick distance (p<.05). At P1, COM horizontal velocity would be related to COM vertical velocity of P1 and P2 (p<.05). Based on the findings, success factors of $540^{\circ}\acute{y}$ Dwihuryeochagi were COM horizontal velocity of P1, COM vertical velocity of P2, the time, kick distance, velocity, angle of lower extremities and coordination of P3-P4.

• Korean Journal of Applied Biomechanics
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• v.26 no.2
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• pp.221-228
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• 2016

Objective: The purpose of this study was to investigate differences in gait parameters and symmetry between walking speed by using the Froude number and preferred walking speed. Method: Fifty adults (age: $21.0{\pm}1.7years$, body weight: $71.0{\pm}9.2kg$, height: $1.75{\pm}0.07m$, leg length: $0.89{\pm}0.05m$) participated in this study. Leg length-applied walking speed was calculated by using the Froude number, defined as Fr = ${\upsilon}^2$/gL, where v is the velocity, g is the gravitational acceleration, and L is the leg length. Video data were collected by using eight infrared cameras (Oqus 300, Qualysis, Sweden) and the Qualisys Track Manager software (Qualisys, Sweden), with a 200-Hz sampling frequency during two-speed walking (preferred walking speed [PS] and leg length-applied walking speed [LS]) on a treadmill (Instrumented Treadmill, Bertec, USA). The step length, stride length, support percentage, cadence, lower joint angle, range of motion (ROM), and symmetry index were then calculated by using the Matlab R2009a software. Results: Step and stride lengths were greater in LS than in PS (p < 0.05). The right single-support percentage was greater in LS than in PS (p < 0.05). The hip joint angle at heel contact and toe-off were greater in LS than in PS (p < 0.05). The hip and knee joint ROM were greater in LS than in PS (p < 0.05). Conclusion: Based on our findings, we suggest that increased walking speed had a significant effect on step length, stride length, support percentage, and lower joint ROM.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.13 no.10
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• pp.4703-4710
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• 2012

The purpose of this study was to examine the impact of the social maturity of sustained sport-for-all participants on their physical and mental health. The subjects in this study were 190 company employees who were selected by convenience sampling from among the residents in Gangwon Province. The selected office workers continued to participate in sport-for-all programs. After a survey was conduced from November 7 to 25, 2011, the statistical package SPSS WIN 18.0 was employed to analyze the collected data. To find out the general characteristics of the subjects, frequency analysis was made, and the reliability test of the instrument and factor analysis were carried out. Descriptive statistics analysis was made by factor, and multiple regression analysis was utilized to look for connections among their variables. As a result, it's found that the social maturity of the sustained sport-for-all participants made a significant difference to their physical health, and that their social maturity made a significant difference to mental health as well. As sustained sport-for-all participation was found to be correlated to their physical and mental health, office workers should be given a chance to participate in sport-for-all on a long-term basis.