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Korean Journal of Sport Biomechanics

  • : 한국운동역학회
  • : 예체능분야  >  체육학
  • : KCI등재
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  • : 연속간행물
  • : 계간
  • : 1226-2226
  • : 2093-9752
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수록정보
수록범위 : 2권1호(1992)~32권3호(2022) |수록논문 수 : 1,234
한국운동역학회지
32권3호(2022년 09월) 수록논문
최근 권호 논문
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KCI후보

저자 : Jeong Ok Yang , Jook Sook Lee

발행기관 : 한국운동역학회 간행물 : 한국운동역학회지 32권 3호 발행 연도 : 2022 페이지 : pp. 69-79 (11 pages)

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Objective: The purpose of this study is to analyze trends related to sports and artificial intelligence (AI) to understand the trends and how they change according to time, and to establish methods to apply AI in sports. Both macro and micro perspectives related to sports utilization of AI were analyzed.
Method: In this study, after analyzing and discussing various information related to the use of artificial intelligence in the sports through a search of academic journals, papers, books, and websites published recently at nationally and internationally, the application plan of artificial intelligence in the sports field was presented.
Results: 1) Motion analysis technology using artificial intelligence is effective in sports where posture is important, and if it provides systematic feedback and training methods, it can help improve performance. 2) The introduction of a sports referee judgment system using artificial intelligence is expected to improve performance by restoring factual judgment and objective fairness in sports games. 3) Artificial intelligence will provide coaching staff and players with a variety of information to help improve performance through systematic coaching and improving feedback and enhanced training methods. 4) It is judged that artificial intelligence-related to sports ethics, sports ICT, sports marketing, sports prediction, etc. We think that based on the current AI research trends will have a positive impact on all sports-related areas, helping to revitalize sports.
Conclusion: Motion analysis technology using artificial intelligence, sports referee judgment system, coaching using artificial intelligence, and artificial intelligence are judged to have a positive effect on all sports-related areas and help revitalize sports.

KCI후보

저자 : Jun Sung Park , Byung Hoon Woo

발행기관 : 한국운동역학회 간행물 : 한국운동역학회지 32권 3호 발행 연도 : 2022 페이지 : pp. 80-86 (7 pages)

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Objective: The purpose of this study was to investigate the effects of three rotational jump conditions (standing jump, left rotational jump and right rotational jump) on stability through center of pressure (COP) and EMG variables analysis.
Method: A total of 16 college students (age: 24.13 ± 7.17 years, height: 169.24 ± 8.23 cm, weight: 65.65 ± 13.88 kg) participated in this study. The study used wireless two COP plates and wireless eight channel EMG. The analyized variables were 11 variables for COP and RMS for EMG, which were analyzed using one-way analysis of variance with repeated measures according to three rotational jump conditions.
Results: Among the COP variables, left rotational jump (LRJ) and right rotational jump (RRJ) were larger than standing jump (SJ) for left and right amplitude, area, total displacement, and average velocity for both feet among the variables of COP, and for area of the left foot, RRJ was larger than that of SJ. Among the EMG variables, there was no statistical difference between the muscle activations, but the muscle activity was significantly higher in the order of RRJ, LRJ, and SJ according to direction of rotation.
Conclusion: Although the results of COP and EMG were not consistent through this study, it can be expected that the differences in COP was due to the amount of rotation during rotational jump-landing in the left and right directions, and that the EMG is determined by the lateral movements required for rotation.

KCI후보

저자 : Min Joo Kim , Jae Kun Shim

발행기관 : 한국운동역학회 간행물 : 한국운동역학회지 32권 3호 발행 연도 : 2022 페이지 : pp. 87-93 (7 pages)

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Objective: The purpose of this research was to investigate the age-related changes in whole-body motor variability during sit-to-stand (STS) task. It has been reported that children perform motor tasks less accurately with greater variability as compared to adults. However, it is still unknown how they utilize the abundant degrees of freedom and accomplish voluntary actions. Uncontrolled manifold (UCM) analysis has been used to partition motor variabilities into two independent variability components, task-relevant variability ( ORT ) and task-irrelevant variability ( UCM). We investigated what differences exist between children and adults with respect to these two motor variability components in relation to motor development stages.
Method: Ten 6-year-old children (height: 116.2 ± 4.3 cm, weight: 23.1 ± 3.9 kg, motor development assessment percentile score: 77.5 ± 18.6%), ten 10-year-old children (height: 138.7 ± 7.2 cm, weight: 35.8 ± 10.3 kg, motor development assessment percentile score: 73.9 ± 12.7%), and ten young adults (age: 23 ± 1.6 year-old, height: 164.3 ± 11.4 cm, weight: 60.8 ± 12.0 kg) participated in this study. Each participant performed STS ten times, and a motion capture system was used to capture the whole-body kinematics. Each segment centers of mass and the whole-body center of mass were calculated, and UCM analysis was used to quantify motor variabilities,  ORT and  UCM. One-way ANOVA was used for statistical analysis.
Results: We found that children produced more motor variabilities in  ORT and  UVM in all three dimensions, anterior-posterior, medial-lateral, and vertical. As age increased, both,  ORT and  UCM significantly decreased (p<.05).
Conclusion: The greater  ORT found in children compared to adults indicates that the repeatability over repetitions improves through development, while the greater  UCM found in children suggests that children better utilize the abundant degrees of freedom during STS compared to adults.

KCI후보

저자 : Shin-young Park , Do-kyung Ko , Hyeong Do Jeong , Hanall Lee , Hyungwoo Lee , Chanki Kim , Seungho An , Jiyoung Kim , Bosung Moon , Jee-soo Son , Dohyeon Lee , Eui-young Lee , Ju Hak Lee , Seungbin Im

발행기관 : 한국운동역학회 간행물 : 한국운동역학회지 32권 3호 발행 연도 : 2022 페이지 : pp. 94-102 (9 pages)

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Objective: The purpose of this study was to investigate the effect of acute transcranial direct current stimulation (tDCS) on the isokinetic muscular endurance of the lower extremity for young adults.
Method: Thirteen young adults performed isokinetic fatigue tasks for two experimental conditions including real tDCS and sham stimulation protocols. Before and after the task, the tensiomyography was used for evaluating muscle contraction characteristics of vastus medialis and semitendinosus. Paired t-test was performed to compare the fatigue index, changes in maximum radial displacement (ΔDm), delay time (ΔTc), and velocity of contraction (ΔVc) between tDCS conditions.
Results: We found no significant differences in the fatigue index between real and sham conditions. In addition, the analyses identified no significant different values of ΔDm, ΔTc, and ΔVc in the vastus medialis and semitendinosus between real and sham conditions.
Conclusion: These findings suggest that the tDCS protocols may have no acute effect on lower limb muscle endurance for young adults. Future studies should consider the long-term effects of repetitive tDCS sessions, various stimulation positions, exercise tasks, and participant characteristics to more clearly understand the effect of tDCS on muscle endurance of lower extremities.

KCI후보

저자 : Hyungwoo Lee , Seungho An , Kyoungkyu Jeon

발행기관 : 한국운동역학회 간행물 : 한국운동역학회지 32권 3호 발행 연도 : 2022 페이지 : pp. 103-110 (8 pages)

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Objective: The aim of this study was to investigate effect of core stabilization exercises on the erector spinae contractile properties and trunk isokinetic muscle function of middle age with low physical activity and sedentary lifestyle.
Method: Twenty (female: n=10, male: n=10) middle-age subjects (age: 37.25 ± 6.08 years, height: 168.01 ± 6.84 cm, weight: 71.37 ± 11.75 kg) participated in this study. Tensiomyography was measured on the erector spinae, and the isokinetic trunk muscle function test was measured at an angular velocity of 60 °/s and 90 °/s. All subjects performed the core stabilization exercises for 60 min per day, 3 times a week, for 7 weeks. A paired t-test was performed with a significance level of 0.05.
Results: Tensiomyography of the erector spinae revealed a significant post-exercise increase in the maximum radial displacement (p < .05) and velocity of contraction (p < .05), however, there wasn't a significant post-exercise change in the contraction time. Additionally, the isokinetic muscle function test of the trunk revealed a significant post-exercise increase in trunk extensor relative strength (p < .05) and strength ratio (p < .05).
Conclusion: Our results indicated that core stabilization exercises reduced erector spinae muscle stiffness, increased the velocity of erector spinae contraction. Additionally, data showed the improvement in the trunk extensor strength help induce a more balanced development in trunk muscle.

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